WO2013039241A1 - Élément optique et procédé de fabrication s'y rapportant - Google Patents

Élément optique et procédé de fabrication s'y rapportant Download PDF

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Publication number
WO2013039241A1
WO2013039241A1 PCT/JP2012/073748 JP2012073748W WO2013039241A1 WO 2013039241 A1 WO2013039241 A1 WO 2013039241A1 JP 2012073748 W JP2012073748 W JP 2012073748W WO 2013039241 A1 WO2013039241 A1 WO 2013039241A1
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WO
WIPO (PCT)
Prior art keywords
optical
optical element
marking
character
lens
Prior art date
Application number
PCT/JP2012/073748
Other languages
English (en)
Japanese (ja)
Inventor
佐藤望
澤上明
菅忍
Original Assignee
コニカミノルタアドバンストレイヤー株式会社
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 コニカミノルタアドバンストレイヤー株式会社 filed Critical コニカミノルタアドバンストレイヤー株式会社
Priority to CN201280044777.7A priority Critical patent/CN103959381A/zh
Publication of WO2013039241A1 publication Critical patent/WO2013039241A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective 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
    • B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
    • B29C45/374—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles for displaying altering indicia, e.g. data, numbers
    • 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
    • B29D11/00317—Production of lenses with markings or patterns
    • B29D11/00326—Production of lenses with markings or patterns having particular surface properties, e.g. a micropattern
    • 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
    • B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
    • 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

Definitions

  • the present invention relates to an optical element incorporated in an optical pickup device and a manufacturing method thereof, and more particularly to a resin optical element formed by injection molding and a manufacturing method thereof.
  • marking is performed on the flange portion of the optical element, and historical information about the manufacturing equipment is obtained by the marking (specifically, which mold was manufactured once.
  • a method for identifying which cavity in the mold was molded for example, see Patent Document 1.
  • Patent Document 1 describes that hemispherical marking is formed on the lower surface of the flange portion having a step.
  • An object of the present invention is to provide an optical element recorded so that information on a manufacturing jig or the like can be easily read and a manufacturing method thereof.
  • an optical element according to the present invention is an optical element incorporated in an optical pickup device, which is formed of a resin, an optical function part, and a flange part formed around the optical function part.
  • Convex character marking is provided on the uppermost surface of the flange portion on the optical information recording medium side.
  • the character marking is identification information having a character as a constituent element, and can also include a figure and a symbol.
  • the character marking is provided on the flange portion, it is possible to directly identify information on the manufacturing jig or the like when the optical element is manufactured without using a replacement table or the like by the character marking. This makes it possible to improve identification and workability in subsequent management.
  • a transfer surface can be provided by forming a depression corresponding to the character marking on the transfer surface of the mold, and the transfer surface can be easily processed. Further, by providing character marking on the uppermost surface on the optical information recording medium side, detection and recognition of character marking becomes relatively easy.
  • the height h of the convex character marking is 0.003 mm ⁇ h ⁇ 0.020 mm.
  • the height h of the character marking is 0.020 mm or less as described above. In addition, it is preferable that the height h of the character marking is 0.010 mm or less because WD can be secured more reliably.
  • the component of the convex character marking is sized to fit within a square region having a side length of D, and the length D is 0.05 mm ⁇ D ⁇ 0.30 mm. It is.
  • the square area containing the components of the character marking more than the above lower limit, the size of the character is increased to such an extent that transferability can be ensured, and the characters etc. are buried without being neatly transferred or crushed. Can be prevented.
  • the space in the flange portion is easily secured by setting the square area that accommodates the components of the character marking to the upper limit or less.
  • the flange portion further has a gate identification marking on the opposite side of the gate portion where the resin has been introduced. In this case, the position of the gate at the time of molding can be reliably identified.
  • the optical function unit includes a first optical surface and a second optical surface disposed on the optical information recording medium side of the first optical surface, and the optical information recording medium of the flange portion.
  • the uppermost surface on the side protrudes from the uppermost surface of the second optical surface.
  • the optical function unit includes a first optical surface and a second optical surface disposed on the optical information recording medium side of the first optical surface, and is the uppermost surface of the second optical surface. This protrudes from the uppermost surface of the flange portion on the optical information recording medium side.
  • the protrusion amount of the optical element on the side of the optical information recording medium can be suppressed to a functionally necessary minimum, and when the optical element is an objective lens, it becomes easy to secure WD for the flange portion.
  • the first optical surface has a larger curvature than the second optical surface.
  • the character marking can be formed on the second optical surface side instead of the first optical surface side which becomes the reference surface, so that the accuracy of attaching the optical element to the apparatus can be improved. it can.
  • the relative position between the gate identification marking and the first character of the character marking is 90 °.
  • the reproducibility and accuracy of the processing can be improved, and the reliability of the detection of the character marking can also be improved.
  • Still another aspect of the present invention has a mirror surface portion that generates reflected light that enables measurement of the inclination of the optical function portion, and the uppermost surface on the optical information recording medium side of the flange portion is on the outer periphery of the mirror surface portion.
  • the optical element is an objective lens arranged to face the optical information recording medium.
  • the optical element is a coupling lens disposed between a light source and an objective lens.
  • the optical element is incorporated into an optical pickup device for a Blu-ray disc.
  • an optical element manufacturing method is a resin optical element manufacturing method in which an optical element incorporated in an optical pickup device is molded using an injection molding apparatus having a movable mold and a fixed mold. And a step of forming a character marking on the uppermost surface of the optical information recording medium side of the flange portion formed around the optical function portion of the optical element.
  • the character marking is movable and fixed. It is formed by transferring one of the molds.
  • the character-like marking is identification information having a character, a figure, a symbol, or the like as a constituent element, and includes cases where only a figure or a symbol is used as a constituent element in addition to the character.
  • the letter-like marking is formed on the flange portion by transfer, the information regarding the mold parts and the arrangement of the optical element when the optical element is produced is read by using the letter-like marking. Therefore, it is possible to directly identify the information, and it is possible to improve identification and workability in the subsequent management.
  • the character marking on the uppermost surface on the optical information recording medium side, detection and recognition of the character marking becomes relatively easy.
  • the character-like marking is formed by a movable mold.
  • the first optical surface is deeper with a larger curvature than the second optical surface, for example, when the first optical surface is formed on the fixed mold side, there is no marking when the mold is opened to release the optical element from the fixed mold.
  • the mold release resistance can be reduced with respect to one optical surface or the like.
  • the second optical surface having a small release resistance can be protruded, so that the optical element is hardly deformed.
  • the movable mold has a core part and a holding part that holds the core part from the periphery, and forms a letter-like marking by transferring the holding part.
  • the character-shaped marking is formed by the holding portion, and when the shape corresponding to the character-shaped marking is formed in the movable mold, the influence on the core portion corresponding to the optical function portion may be reduced. it can.
  • the optical part of the optical function part can be finely adjusted by rotating the core part.
  • the fixed mold has a core portion and a holding portion that holds the core portion from the periphery.
  • FIG. 2A is a cross-sectional view for explaining a mold space for molding an optical element
  • FIG. 2B is a plan view of a transfer surface on the second mold side in FIG. 2A
  • 3A is a cross-sectional view of a lens that is an optical element
  • FIG. 3B is an enlarged conceptual diagram viewed from the side of the character marking
  • FIG. 4A is a plan view seen from the first optical surface of the lens
  • FIG. 4B is a plan view seen from the second optical surface of the lens.
  • FIG. 13A and 13B are diagrams illustrating a modification of the optical element shown in FIG. 3A and the like.
  • an injection molding apparatus 100 for carrying out the manufacturing method of the present embodiment includes a molding die 40, and the molding die 40 is a first die 41 that is a fixed die and a movable die.
  • a second mold 42 is provided.
  • die 42 is driven by the opening / closing drive apparatus 79, and can be reciprocated to AB direction.
  • the second mold 42 is moved toward the first mold 41, and both molds 41 and 42 are mold-matched with the parting surfaces PS1 and PS2 and are clamped to partially expand in FIG.
  • a mold space CV for molding the lens 10 as an optical element and a flow path space FC for supplying resin to the mold space CV are formed.
  • a plurality of mold spaces CV and flow path spaces FC may be formed in the molding die 40.
  • the mold space CV includes the main body space CV1 sandwiched between the first and second transfer surfaces S1 and S2, and the third, fourth, fifth, and sixth transfer surfaces S3, S4, and S5. , S6 and a flange space CV2 surrounded by S6.
  • the pair of opposing first and second transfer surfaces S1 and S2 facing the main body space CV1 are the first and second optical function portions 11 in the center of the lens 10 shown enlarged in FIGS. 3A, 4A, and 4B. This is a portion for forming the second optical surfaces OS1 and OS2.
  • one first transfer surface S1 is deeper and larger in curvature than the other second transfer surface S2, and a fine uneven pattern for transferring the fine structure FS or the fine shape of the first optical surface OS1.
  • An FP is provided.
  • the third, fourth, fifth, and sixth transfer surfaces S3, S4, S5, and S6 surrounding the flange space CV2 are portions for forming the flange portion 12 of the lens 10.
  • the third, fourth, and sixth transfer surfaces S3, S4, and S6 facing the flange space CV2 are the first, second, and third flange surfaces 12a of the lens 10 shown in an enlarged view in FIG. 3A and the like. , 12b, and 12c.
  • the fifth transfer surface S5 facing the flange space CV2 is a portion for forming the outer peripheral side surface SS of the lens 10.
  • a convex character marking M1 and a gate identification marking M2 are provided on the uppermost surface 2b of the second flange surface 12b of the flange portion 12 shown in FIG. 3A and the like.
  • the sixth transfer surface S6 is provided with recesses MS1 and MS2, respectively.
  • the flow path space FC has a runner part RS as a space for forming the runner part RP in the molded product MP shown in FIGS. 2A, 3A, etc., and the runner part RS is interposed via the gate part GS. It communicates with the mold space CV.
  • the space of the gate portion GS forms a gate portion GP that connects the lens 10 and the runner portion RP in the molded product MP.
  • the lens 10 as the main body has an optical function part 11 having an optical function and an outer edge of the optical function part 11 radially outward as described above. And a substantially annular flange portion 12 provided.
  • the lens 10 is an objective lens for a thick-type optical pickup device having a large protrusion on the first optical surface OS1 side.
  • the lens 10 is a plastic lens.
  • the plastic material in the present embodiment is, for example, a cycloolefin resin, and trade name APEL manufactured by Mitsui Chemicals, Inc., or trade name ZEONEX manufactured by Nippon Zeon Co., Ltd. can be used.
  • the lens 10 has an on-axis lens thickness d (mm) and a focal length of the lens 10 in a light beam having a wavelength of 500 nm or less is f (mm). 2.0 is satisfied.
  • the first optical surface OS1 has a fine structure FS (optical path difference providing structure including a plurality of steps) having a step of a diffractive structure in order to be compatible with multiple wavelengths. That is, the lens 10 is a three-wavelength compatible optical element corresponding to a short wavelength, high numerical aperture standard, a medium wavelength, medium numerical aperture standard, and a long wavelength, low numerical aperture standard.
  • the fine structure FS provided on the optical surface OS1 has a shape that allows light collection in conformity with each wavelength.
  • OT is formed concentrically around the optical axis OA.
  • a first optical path difference providing structure is formed in the central region CN, and a second optical path difference providing structure is formed in the intermediate region MD.
  • a third optical path difference providing structure is formed in the peripheral region OT.
  • the third optical path difference providing structure is a blazed diffractive structure.
  • the first optical path difference providing structure formed in the central region CN of the lens 10 is a structure in which the first basic structure and the second basic structure are overlaid as shown in FIG.
  • the first basic structure makes the first-order diffracted light quantity of the first light beam (first wavelength; eg, 405 nm) that has passed through the first basic structure larger than any other order diffracted light quantity, and passes through the first basic structure.
  • the first-order diffracted light quantity of the second light flux (second wavelength; for example, 658 nm) is made larger than any other order diffracted light quantity, and the third light flux (third wavelength; for example, 785 nm) that has passed through the first basic structure.
  • the first order diffracted light amount is made larger than any other order diffracted light amount.
  • At least the first basic structure provided in the vicinity of the optical axis OA of the central region CN has a step in a direction opposite to the optical axis OA.
  • the second basic structure makes the second-order diffracted light quantity of the first light beam that has passed through the second basic structure larger than the diffracted light quantity of any other order, and the first-order of the second light beam that has passed through the second basic structure.
  • the diffracted light quantity is made larger than any other order diffracted light quantity, and the first order diffracted light quantity of the third light flux that has passed through the second basic structure is made larger than any other order diffracted light quantity.
  • the step is directed in the direction of the optical axis OA, and the wavelength of the incident light beam is longer in the first basic structure and the second basic structure.
  • the spherical aberration changes in the direction of insufficient correction.
  • the lens 10 may be a lens corresponding only to a BD (Blu-ray) Disc) having a wavelength of 405 nm and a numerical aperture (NA) of 0.85.
  • one first optical surface OS1 is disposed on the laser light source side and protrudes larger than the other second optical surface OS2 disposed on the optical disk side which is an optical information recording medium. Is getting bigger. Further, since the curvature of the first optical surface OS1 is extremely large, the lens 10 has a very large thickness at the center and a large thickness ratio p (thickness of the thickest portion ⁇ thickness of the thinnest portion).
  • the first optical surface OS1 on the light source side of the lens 10 is provided with three layers of antireflection films.
  • This antireflection film is provided using a vacuum deposition method.
  • SiO 2 or ZrO 2 is used as the material of the antireflection film on the first optical surface OS1.
  • the second optical surface OS2 on the optical disc side of the lens 10 is provided with a seven-layer antireflection film.
  • the antireflection film is provided by using this vacuum deposition method.
  • a material of the antireflection film on the second optical surface OS2 for example, SiO 2 , ZrO 2 , a mixed material of SiO 2 and Al 2 O 3 , or the like is used.
  • the flange portion 12 has a first flange surface 12a extending in a direction perpendicular to the optical axis OA on the first optical surface OS1 side, a second flange surface 12b extending in a direction perpendicular to the optical axis OA on the second optical surface OS2 side, And a third flange surface 12c.
  • the third flange surface 12c extends adjacent to the second optical surface OS2, and serves as a mirror surface as an end surface for alignment.
  • the second flange surface 12b is provided on the outer periphery of the third flange surface 12c.
  • the flange portion 12 has a step structure b2 on the second flange surface 12b side.
  • the step on the outside of the lens 10 is higher toward the information recording medium side than the step on the center side of the lens 10.
  • a step-shaped convex transfer surface S22 for forming the step structure b2 is provided on the inner side of the holding portion 74b of the second mold 42. Since the lens 10 has the step structure b2, even if a burr due to the boundary between the second core portion 74a and the holding portion 74b occurs on the second flange surface 12b side, the burr is stored in the space formed by the step structure b2. Can do. Thereby, it is possible to prevent the distance (WD: working distance) between the information recording medium and the lens 10 from being changed due to the variation of the burr length during molding.
  • the gate portion GP is formed on a part of the outer peripheral side surface SS of the flange portion 12, but is removed by a finishing process after taking out from the molding die 40.
  • the gate part GP is cut in a straight line including a part of the flange part 12 in a direction perpendicular to the radial direction of the lens 10 extending to the gate part GP. This cut shape is usually called a D-cut shape.
  • the uppermost surface TP2 of the second optical surface OS2 protrudes from the uppermost surface TP1 of the step structure b2 of the second flange surface 12b on the optical disc side of the flange portion 12.
  • convex character marking M1 and hemispherical gate identification marking M2 are provided on the uppermost surface TP1 of the step structure b2 of the second flange surface 12b.
  • the character marking M1 is for identifying information relating to a manufacturing jig or the like when the lens 10 is manufactured.
  • the gate identification marking M2 is for identifying the position of the gate part GP at the time of molding.
  • the character marking M1 is provided at a position of 90 ° counterclockwise with respect to the gate part GP.
  • the gate identification marking M2 is provided on the opposite side of the gate part GP.
  • the relative position between the gate identification marking M2 and the first first character of the character marking M1 is 90 °. This is for improving the reproducibility and accuracy of processing and improving the detection reliability of the character marking M1 when the second die 42 is subjected to the groove processing corresponding to the character marking M1.
  • the height h1 of the character marking M1 and the height h2 of the gate identification marking M2 are 0.003 mm or more and 0.020 mm or less, respectively.
  • the lens 10 is an objective lens that is compatible with a plurality of types of optical information recording media, it is necessary to ensure a WD (working distance) for all types of optical information recording media.
  • the heights h1 and h2 of the character marking M1 and the gate identification marking M2 are set to 0.020 mm or less as described above. It is desirable. In order to ensure WD more reliably, it is more desirable that the heights h1 and h2 of the character marking M1 and the gate identification marking M2 be 0.010 mm or less.
  • the character marking M1 has, for example, constituent elements of four character parts J1, J2, J3, and J4.
  • the character portions J1, J2, J3, and J4 are arranged on the arc of the second flange surface 12b in order from the character portion J1, which is the first character, starting from a position of 90 ° counterclockwise from the gate portion GP. .
  • the character portions J1, J2, J3, and J4 are sized to fit within a square region having a side length D. Specifically, the length D is 0.05 mm or more and 0.30 mm or less.
  • the space in the flange portion 12 can be easily secured by setting the square area that accommodates the character portions J1, J2, J3, and J4 to be equal to or less than the above upper limit.
  • interval for each character is dense, since visibility becomes good, the space
  • the first mold 41 on the fixed side includes a first core part 64 a as a central part that forms the mold space CV shown in FIG. 2 from the first mold 41, and the periphery of the first core part 64 a.
  • a holding part 64b as a peripheral part provided in the base plate and a receiving plate 64c for supporting the first core part 64a and the holding part 64b from the back are provided.
  • the first core portion 64a is incorporated in a through hole 64g formed in the holding portion 64b and fixed with a bolt (not shown).
  • the leading end surface of the first core portion 64a is a first transfer surface S1 for forming a first optical surface OS1 of the lens 10 at a main portion.
  • the holding portion 64b having the third transfer surface S3 is arranged around the first core portion 64a having the first transfer surface S1, so that the outer edge portion of the first core portion 64a is connected to the main body space CV1 and the flange space. It is in a state of biting into the boundary with CV2.
  • the end surface 64e of the holding portion 64b is formed with a concave portion to be the runner portion RP of the molded product MP shown in FIG.
  • the second mold 42 on the movable side includes a second core part 74a as a central part that forms the mold space CV shown in FIG. 2A from the second mold 42, and a peripheral part provided around the second core part 74a.
  • the movable rods 75 and 76 that push the 74a and the projecting member 74p from the back, and the advance / retreat mechanism 78 that moves the movable rods 75 and 76 in the axis AX direction are provided.
  • the second core portion 74a is incorporated in a through hole 74g formed in the holding portion 74b so as to be movable back and forth along the axis AX direction.
  • the projecting member 74p is also incorporated in a through hole 74h formed in the holding portion 74b so as to be movable back and forth along the axis AX direction.
  • the 2nd core part 74a is urged
  • the protruding member 74p is driven by the movable rod 76 to advance toward the first mold 41 side, and when the mold is closed, an external force by a holding portion 64b on the first mold 41 side, which will be described later, or resin at the time of resin inflow Treatments by pressure and returns to the original position.
  • the protruding member 74p may be automatically retracted and returned to its original position by using a spring.
  • the end surface 74e of the holding portion 74b is formed with a recess that should become the runner portion RP of the molded product MP shown in FIG. 3A.
  • the optical surface OS1 having a relatively large curvature is formed by a fixed mold, the optical surface is likely to be deformed due to an axial deviation when the first and second molds 41 and 42 are opened.
  • a taper pin or a taper block for the template as disclosed in, for example, Japanese Utility Model Laid-Open No. 7-9945.
  • FIG. 6 is a flowchart conceptually illustrating a method of manufacturing an optical element using the molding die 40 shown in FIG.
  • dies 41 and 42 are produced (step S11).
  • Concave portions MS1 and MS2 for forming the character marking M1 and the gate identification marking M2 are formed on the convex transfer surface S22 of the holding portion 74b of the second mold 42. That is, the character marking M1 and the gate identification marking M2 are formed by the second mold 42 that is a movable type.
  • the recesses MS1 and MS2 are processed by, for example, a laser marker, electric discharge machining, or the like. It should be noted that the processing with the laser marker is easy to recognize because the convex amount of the marking is small.
  • step S12 the first and second molds 41 and 42 are attached to the injection molding apparatus 100, the opening / closing drive unit 79 is operated, and the second mold 42 is relatively advanced toward the first mold 41. Mold closing is started (step S12). Note that the surfaces of both molds 41 and 42 are heated to a temperature suitable for molding.
  • the opening / closing drive device 79 By continuing the closing operation of the opening / closing drive device 79, the first mold 41 and the second mold 42 are moved to the mold contact position where they are in contact with each other, the mold closing is completed, and the opening / closing drive device 79 is further closed. By continuing, the mold clamping which clamps the 1st metal mold
  • a vacuum device (not shown) is operated to evacuate the mold space CV between the clamped first mold 41 and the second mold 42 (step S14).
  • the mold space CV is appropriately decompressed, and the molten resin is reliably filled into the first transfer surface S1 having a relatively large curvature.
  • an injection device (not shown) is operated to inject the molten resin into the mold space CV at a necessary pressure (step S15).
  • the injection device maintains the resin pressure in the mold space CV.
  • step S16 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 completion of molding (step S16).
  • the opening / closing drive device 79 is operated to perform mold opening for relatively moving the second mold 42 backward (step S17).
  • the second mold 42 moves backward, the first mold 41 and the second mold 42 are separated from each other.
  • the molded product MP that is, the lens 10 remains on the second mold 42 side. That is, the lens 10 is released from the first mold 41 while being held so as to be embedded in the movable second mold 42.
  • step S18 the advance / retreat mechanism 78 is operated, and the molded product MP remaining in the second mold 42 is ejected to the first mold 41 side by the movable rods 75 and 76 (step S18). As a result, the molded product MP is released. At this time, the lens 10 is completely pushed out of the holding portion 74b.
  • a take-out device (not shown) is operated to separate the molded product MP from the second mold 42 and carry it out (step S19).
  • the portion of the molded product MP excluding the lens 10 is gripped.
  • the sticking force of the second optical surface OS2 to the second transfer surface S2 of the second core portion 74a is relatively small. Therefore, since the molded product MP can be easily removed from the second core portion 74a, it is possible to prevent a biased force from being applied to part of the outer periphery of the lens 10.
  • optical pickup device PU1 incorporating the lens 10
  • the lens 10 is an objective lens capable of appropriately recording and / or reproducing information on, for example, BD, DVD (Digital Versatile Disc), and CD which are different optical disks.
  • the optical pickup device PU1 emits light when recording / reproducing information with respect to the lens 10, the ⁇ / 4 wavelength plate QWP, the collimating lens COL, the polarization beam splitter BS, the dichroic prism DP, and the BD.
  • the light is converted into parallel light, converted from linearly polarized light into circularly polarized light by the ⁇ / 4 wavelength plate QWP, and the diameter of the light flux is regulated by a diaphragm (not shown) and is incident on the lens 10.
  • the light beam condensed by the central region, the intermediate region, and the peripheral region of the lens 10 becomes a spot formed on the information recording surface RL1 of the BD via the protective substrate PL1.
  • the reflected light beam modulated by the information pits on the information recording surface RL1 is transmitted again through the lens 10 and a diaphragm (not shown), converted from circularly polarized light to linearly polarized light by the ⁇ / 4 wavelength plate QWP, and converged by the collimating lens COL.
  • the light beam is reflected by the polarization beam splitter BS, and converges on the light receiving surface of the light receiving element PD via the sensor lens SEN.
  • the information recorded on the BD can be read by using the output signal of the light receiving element PD to focus or track the lens 10 by the biaxial actuator AC1.
  • the spherical aberration generated due to the wavelength fluctuation or different information recording layers is changed in magnification.
  • the collimating lens COL as a means is changed in the direction of the optical axis OA, and can be corrected by changing the divergence angle or the convergence angle of the light beam incident on the lens 10.
  • the light is converted from linearly polarized light to circularly polarized light by the / 4 wavelength plate QWP and enters the lens 10.
  • the light beam condensed by the central region and the intermediate region of the lens 10 (the light beam that has passed through the peripheral region is flared and forms a spot peripheral portion) is transmitted through the protective substrate PL2 to the information recording surface of the DVD. It becomes a spot formed on RL2, and forms the center of the spot.
  • the reflected light beam modulated by the information pits on the information recording surface RL2 passes through the lens 10 again, is converted from circularly polarized light to linearly polarized light by the ⁇ / 4 wavelength plate QWP, and is converted into a convergent light beam by the collimating lens COL.
  • the light is reflected by the beam splitter BS and converges on the light receiving surface of the light receiving element PD via the sensor lens SEN. And the information recorded on DVD can be read using the output signal of light receiving element PD.
  • the light is converted from linearly polarized light to circularly polarized light by the ⁇ / 4 wave plate QWP and enters the lens 10.
  • the light beam condensed by the central region of the lens 10 (the light beam that has passed through the intermediate region and the peripheral region is flared and forms a spot peripheral part) is passed through the protective substrate PL3, and the information recording surface of the CD It becomes a spot formed on RL3.
  • the reflected light beam modulated by the information pits on the information recording surface RL3 passes through the lens 10 again, is converted from circularly polarized light to linearly polarized light by the ⁇ / 4 wave plate QWP, and is converted into a convergent light beam by the collimating lens COL.
  • the light is reflected by the beam splitter BS and converges on the light receiving surface of the light receiving element PD via the sensor lens SEN.
  • the information recorded on CD can be read using the output signal of light receiving element PD.
  • the manufacturing jig when the lens 10 is manufactured, and the like since the character marking M1 and the gate identification marking M2 are provided on the flange portion 12, the manufacturing jig when the lens 10 is manufactured, and the like.
  • the information can be directly identified without using a replacement table or the like by the character marking M1 or the like.
  • the discriminability and workability can be enhanced in the subsequent management of the lens 10.
  • transfer is performed by forming depressions (recesses MS1, MS2) corresponding to the character markings M1 and the like on the convex transfer surface S22 of the second mold 42. A surface can be provided, and the transfer surface can be easily processed.
  • the character marking M1 and the like on the uppermost surface TP1 on the optical disc side which is an optical information recording medium, detection and recognition of the character marking M1 and the like becomes relatively easy.
  • the inclination of the optical function part 11 is provided on the outer periphery of the third flange surface 12c, which is the mirror surface part, of the uppermost surface TP1 of the flange part 12. , It is possible to prevent a decrease in reflected light for measurement.
  • the third flange surface 12c for measuring the inclination is not provided with the character marking M1 or the like, but is provided with the character marking M1 or the like on the outer periphery thereof, thereby making it possible to prevent the reflected light from being lowered.
  • the character marking M1 or the like is provided further away from the second optical surface OS2
  • the second optical surface OS2 (the optical function unit 11) is processed. ) Can be reduced.
  • Example 1 Hereinafter, examples of the optical surface of the lens 10 according to the above-described embodiment will be described.
  • a power of 10 for example, 2.5 ⁇ 10 ⁇ 3
  • E for example, 2.5 ⁇ E ⁇ 3
  • the optical surface of the objective lens is formed as an aspherical surface that is symmetric about the optical axis OA and is defined by a mathematical formula obtained by substituting the coefficients shown in Table 1 into Formula 1.
  • X (h) is an axis in the optical axis direction (with the light traveling direction being positive), ⁇ is a conical coefficient, Ai is an aspherical coefficient, h is a height from the optical axis, and r is a paraxial radius of curvature. It is.
  • the optical path difference given to the light flux of each wavelength by the diffractive structure is defined by an equation in which the coefficient shown in the table is substituted into the optical path difference function of Formula 2. .
  • h is the height from the optical axis
  • ⁇ is the wavelength of the incident light beam
  • m is the diffraction order
  • B 2i is the coefficient of the optical path difference function.
  • the first optical path difference providing structure of the lens 10 of the first embodiment will be described with reference to FIG. 5 (FIG. 5 is a conceptual diagram different from the actual shape of the first embodiment).
  • the (1/1/1) blaze is added to the second basic structure BS2 that is a (2/1/1) blaze-type diffraction structure in the entire central region.
  • the optical path difference providing structure is formed by superimposing the first basic structure BS1, which is a diffractive structure of the mold.
  • the step of the second foundation structure BS2 faces the direction of the optical axis OA
  • the step of the first foundation structure BS1 faces the direction opposite to the optical axis OA.
  • the average pitch of the first foundation structure BS1 is smaller than the average pitch of the second foundation structure BS2, and the number of steps facing the direction opposite to the optical axis OA of the first foundation structure is the second foundation structure BS2. More than the number of steps facing the direction of the optical axis OA of the structure.
  • the spherical aberration is changed in the direction of insufficient correction.
  • the second optical path difference providing structure of Example 1 has a structure in which the third basic structure that is the same as the first basic structure and the fourth basic structure that is the same as the second basic structure are overlapped in the entire intermediate region. It has become.
  • the step of the third foundation structure faces in the opposite direction to the optical axis OA
  • the step of the fourth foundation structure faces the optical axis OA.
  • the third foundation structure and the fourth foundation structure when the third foundation structure changes so that the wavelength of the incident light beam becomes longer, the spherical aberration changes in the overcorrection direction, and the fourth foundation structure enters. If the wavelength of the light beam is changed so as to be longer, the spherical aberration changes to be undercorrected.
  • the third optical path difference providing structure of Example 1 is composed of only the fifth basic structure.
  • the second-order diffracted light amount of the first light beam that has passed through the fifth basic structure is made larger than the diffracted light amount of any other order, and the first-order diffraction of the second light beam that has passed through the fifth basic structure.
  • It is a blaze-type diffractive structure in which the amount of light is larger than any other order of diffracted light, and the first order diffracted light of the third light beam that has passed through the fifth basic structure is larger than any other order of diffracted light.
  • Table 1 shows the lens data of Example 1.
  • ri represents the radius of curvature
  • di represents the distance from the next surface
  • Ni indicates the refractive index of the lens material.
  • the actual shape of the objective lens was designed based on the lens data of Example 1.
  • the actual shape data is shown in Tables 2 and 3.
  • the actual shape data of each annular zone can be obtained.
  • H represents the height from the optical axis in the direction perpendicular to the optical axis.
  • Ai represents an aspheric coefficient.
  • the first zone to the 104th zone is the central region
  • the 105th zone to the 160th zone is the middle zone
  • the 161th zone is the peripheral region.
  • FIG. 8 shows a conceptual cross-sectional view in the case where the first optical path difference providing structure, the second optical path difference providing structure, and the third optical path difference providing structure of Example 1 are provided in a flat element.
  • the step surface of the optical path difference providing structure is inclined with respect to the optical axis OA, but in FIG. 8, it is arranged as a direction parallel to the optical axis OA for convenience.
  • the central region where the first optical path difference providing structure is provided is the region indicated by CN
  • the intermediate region where the second optical path difference providing structure is provided is the region indicated by MD
  • the peripheral area provided with is an area indicated by OT.
  • the antireflection film of Example 1 will be described.
  • the first optical surface OS1 on the laser light source side of the lens 10 is provided with a three-layer antireflection film shown in Table 4 below.
  • the antireflection film is provided using a vacuum deposition method.
  • the second optical surface OS2 on the optical disc side of the lens 10 is provided with a seven-layer antireflection film shown in Table 3 below.
  • the antireflection film is provided using a vacuum deposition method.
  • the outer diameter g1 of the lens 10 shown in FIG. 3A is 5 mm, and the on-axis thickness g2 of the optical function unit 11 is 2.67 mm.
  • the surface depth g3 of the first optical surface OS1 of the lens 10 is 1.930 mm, the surface diameter g4 of the first optical surface OS1 is 4.015 mm, and the effective diameter g5 of the first optical surface OS1 is 3. It is 850 mm.
  • the surface depth g6 of the second optical surface OS2 of the lens 10 is 0.087 mm
  • the surface diameter g7 of the second optical surface OS2 is 3.033 mm
  • the effective diameter g8 of the second optical surface OS2 is 2. It is 851 mm.
  • the surface diameter refers to the diameter of the optical surface
  • the effective diameter refers to the diameter of the portion of the optical surface through which the light beam passes.
  • the thickness g9 of the flange portion 12 of the lens 10 parallel to the optical axis OA direction is 0.77 mm
  • the width g10 of the first flange surface 12a in the lens radial direction is 0.985 mm
  • the second flange surface 12b is 0.77 mm
  • the lens width g11 in the lens radial direction is 1.967 mm.
  • the thickness g12 of the thinnest portion of the flange portion 12 is 0.653 mm, and the distance g13 from the uppermost surface TP1 of the second flange surface 12b to the uppermost surface TP2 of the second optical surface OS2 is 0.03 mm. Yes.
  • the width g14 of the alignment end face 12c is 0.082 mm.
  • the heights h1 and h2 of the character marking M1 and the gate identification marking M2 are 0.010 mm.
  • the length D of one side of the square area of the character portions J1, J2, J3, and J4, which are components of the character marking M1 is 0.15 mm.
  • the gate cut amount d1 is 0.14 mm. Note that the gate cut amount d1 is the length in the gate axis direction of a portion of the flange portion 12 cut away perpendicularly to the gate axis direction extending to the gate portion GP when viewed from the optical axis OA direction.
  • optical element and a method for manufacturing the optical element according to the second embodiment will be described.
  • the optical element and the method for manufacturing the optical element according to the second embodiment are modifications of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment.
  • the top surface TP1 of the step structure b2 of the second flange surface 12b on the optical disc side of the flange portion 12 protrudes from the top surface TP2 of the second optical surface OS2. Since the second flange surface 12b protrudes from the uppermost surface TP2 of the second optical surface OS2, when the lens 10 is placed on a placement member such as a tray, the second optical surface OS2 is placed downward. However, the flange portion 12 serves as a guard so that the second optical surface OS2 does not contact the mounting member, and the second optical surface OS2 is not damaged.
  • optical element and a method for manufacturing the optical element according to the third embodiment will be described.
  • the optical element and the method for manufacturing the optical element according to the third embodiment are modifications of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment.
  • the first and second molds 41 and 42 in the first embodiment are arranged in reverse. That is, the first mold 41 is a movable mold, and the second mold 42 is a fixed mold.
  • optical element according to the fourth embodiment will be described below.
  • the optical element according to the fourth embodiment is a modification of the first embodiment, and parts that are not particularly described are the same as those in the first embodiment.
  • the gate part GP is cut so as to go around the local part of the flange part 12.
  • This cut shape is usually called a U-cut shape.
  • optical element according to the fifth embodiment will be described below.
  • the optical element according to the fifth embodiment is a modification of the fourth embodiment, and parts that are not particularly described are the same as those in the fourth embodiment.
  • a part of the flange portion 12 near the gate portion GP is cut along the outer periphery thereof. Further, the gate portion GP is cut so as to go around the local portion of the flange portion 12.
  • the gate cut amount d1 is 0.2 mm
  • the arc cut amount d2 is 0.08 mm or less
  • the total cut range d3 is 1.2 mm or more and 2 mm or less.
  • the gate cut amount d1 is the length in the gate axis direction extending from the outer diameter of the lens 10 to the deepest portion of the flange portion 12 as viewed from the optical axis OA direction.
  • the arc cut amount d2 is the length in the gate axis direction of the portion of the flange portion 12 cut away along the outer periphery thereof.
  • the total cut range d3 is a length in a direction perpendicular to the gate axis direction of a portion obtained by cutting a part of the flange portion 12 along the outer periphery thereof.
  • first mold 41 and the second mold 42 horizontally, and it may be a vertical mold in which the first mold 41 and the second mold 42 are arranged vertically.
  • the return force of the core portion 64a is given by the spring, but the core portion 64a can be returned by means other than the spring.
  • the outer peripheral side surface SS of the lens 10 is a cylindrical surface, but the outer peripheral side surface SS may not have a shape symmetrical to the optical axis OA. That is, the outer peripheral side surface SS may be a substantially prismatic surface, or a surface obtained by combining a cylindrical surface and a prismatic surface. Further, a slight taper can be formed on the outer peripheral side surface SS, and a slight taper can also be formed on the fifth transfer surface S5 of the holding portion 74b.
  • the optical surface of the lens 10 may be smooth without providing the microstructure FS or the like on the optical surface.
  • the lens 10 may be a coupling lens disposed between the laser light source and the objective lens.
  • the character marking M1 is composed only of characters, but may be a combination of characters, figures, symbols, and the like. Moreover, only a figure and a symbol are good also as a component as a character-like marking.
  • the constituent elements of the character marking M1 are the four character portions J1, J2, J3, and J4, but the number of constituent elements may be changed as appropriate.
  • the shapes of the character marking M1 and the gate identification marking M2 can be changed as appropriate.
  • the gate identification marking M2 is not limited to a hemispherical shape but may be a convex line shape. Specifically, as shown in FIGS. 13A and 13B, a convex three-line shape can be used.

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

Abstract

La présente invention a pour objectif de procurer un élément optique sur lequel des informations concernant un gabarit et autres sont enregistrées de manière à pouvoir être lues facilement, et de procurer également un procédé de fabrication se rapportant à cet élément optique. Un rebord (12) est muni d'une marque de caractères (M1) ainsi que d'une marque d'identification de grille (M2), et, en conséquence, les informations concernant le gabarit ou autres, qui servent à la fabrication d'une lentille (10), peuvent être directement identifiées suivant la marque de caractères (M1) et autres sans aucune table de remplacement ou autre. Cette configuration permet d'obtenir une meilleure identifiabilité et une plus grande aptitude au façonnage en ce qui concerne la gestion ultérieure des lentilles (10). En outre, la présence de la marque de caractères (M1) et autres sur la surface du dessus (TP1) sur le côté du disque optique, ledit disque optique étant un support d'enregistrement d'informations optique, rend la détection et l'identification de ladite marque de caractères (M1) et autres un peu plus faciles.
PCT/JP2012/073748 2011-09-16 2012-09-14 Élément optique et procédé de fabrication s'y rapportant WO2013039241A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000111709A (ja) * 1998-09-30 2000-04-21 Fuji Photo Optical Co Ltd 光学部品
JP2002062409A (ja) * 2000-08-21 2002-02-28 Konica Corp カップリングレンズ、光ピックアップ装置用の光学系及び光ピックアップ装置
JP2007147888A (ja) * 2005-11-25 2007-06-14 Hitachi Maxell Ltd プラスチックレンズ及び光ピックアップ装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4594328B2 (ja) * 2004-12-17 2010-12-08 パナソニック株式会社 光学ユニット及びその製造方法
CN101174013A (zh) * 2006-11-02 2008-05-07 亚洲光学股份有限公司 具有识别标记的镜片
JP2008213397A (ja) * 2007-03-07 2008-09-18 Konica Minolta Opto Inc 樹脂成形用金型及び光学素子並びに光ピックアップ装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000111709A (ja) * 1998-09-30 2000-04-21 Fuji Photo Optical Co Ltd 光学部品
JP2002062409A (ja) * 2000-08-21 2002-02-28 Konica Corp カップリングレンズ、光ピックアップ装置用の光学系及び光ピックアップ装置
JP2007147888A (ja) * 2005-11-25 2007-06-14 Hitachi Maxell Ltd プラスチックレンズ及び光ピックアップ装置

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