WO2012133578A1 - Lentille de focalisation, procédé de fabrication d'une lentille de focalisation et matrice de moulage - Google Patents

Lentille de focalisation, procédé de fabrication d'une lentille de focalisation et matrice de moulage Download PDF

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Publication number
WO2012133578A1
WO2012133578A1 PCT/JP2012/058230 JP2012058230W WO2012133578A1 WO 2012133578 A1 WO2012133578 A1 WO 2012133578A1 JP 2012058230 W JP2012058230 W JP 2012058230W WO 2012133578 A1 WO2012133578 A1 WO 2012133578A1
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WIPO (PCT)
Prior art keywords
objective lens
optical
lens
flange
mold
Prior art date
Application number
PCT/JP2012/058230
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English (en)
Japanese (ja)
Inventor
清水勉
Original Assignee
コニカミノルタアドバンストレイヤー株式会社
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Priority to JP2013507691A priority Critical patent/JP5733388B2/ja
Publication of WO2012133578A1 publication Critical patent/WO2012133578A1/fr

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    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • 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
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
    • 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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1367—Stepped phase plates
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • 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
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Definitions

  • the present invention relates to an objective lens having a fine shape on an optical surface, particularly an objective lens incorporated in a notebook computer, a manufacturing method thereof, and a molding die used in the manufacturing method.
  • a gate portion that is an inlet through which molten resin flows into a mold space corresponding to the objective lens is disposed on the outer periphery of the flange portion of the objective lens (see, for example, Patent Document 1). ). This is because the gate portion is separated from the optical surface so that molding distortion or the like of the gate portion does not affect the optical surface of the objective lens.
  • the molten resin that has flowed in from the gate portion provided on the outer periphery of the flange portion passes through the neck portion connecting the optical surface of the lens and the flange portion from the gate portion having a relatively small cross-sectional area, and has a relatively wide cross-sectional area. It flows into the mold space corresponding to the optical function part of the lens, and the optical surface is transferred by filling this mold space.
  • the objective lens as disclosed in Patent Document 1 is a small one that is incorporated into, for example, a notebook computer and is compatible with a plurality of types of discs
  • the transfer accuracy of the lens is particularly problematic.
  • the objective lens since such an objective lens is compatible with a plurality of types of discs, the objective lens has a fine shape with a small diameter but a relatively narrow diffraction pitch, and there is a problem that transfer of the fine shape is incomplete.
  • the thickness deviation ratio t / T indicating the degree of neck necking is relatively large, and the amount of molten resin flowing into the mold space corresponding to the optical function portion This is because there is a significant limitation.
  • the molten resin flows from the gate part through the neck part to the optical surface
  • the molten resin that comes into contact with the mold surface such as the gate wall surface is cooled by the mold to increase the viscosity, and only the central part of the inflow part passes through.
  • the molten resin flows into the mold space. Therefore, as the uneven thickness ratio t / T increases, the flow amount of the molten resin is limited. When this is greatly limited, the flow amount of the molten resin into the optical function portion is insufficient, and the mold is not filled. Thus, the transfer to the fine diffraction shape is incomplete.
  • An object of the present invention is to provide an objective lens in which a fine shape or the like is transferred with high accuracy while suppressing restriction of the amount of molten resin flowing into a mold space corresponding to the optical function portion of the lens.
  • Another object of the present invention is to provide a manufacturing method of an objective lens for manufacturing the objective lens and a molding die used in the manufacturing method.
  • an objective lens according to the present invention includes an optical function unit having a fine shape on an optical surface, and a flange provided around the optical function unit and having a reference surface for attaching the lens to a bobbin.
  • the optical function unit includes a first optical surface and a second optical surface having a smaller curvature than the first optical surface, and includes a neck portion between the optical function unit and the flange portion, and lens light.
  • the objective lens with a lens outer diameter G satisfying 1.45 ⁇ G ⁇ 4.05 is a relatively small lens, and the smaller the lens outer diameter G, the smaller the cross-sectional area of the neck portion.
  • the deviation ratio t / T becomes relatively small, and the molten resin flows into the objective lens when it is molded. Limiting the amount can be prevented and an unfilled state can be prevented. Thereby, it can be set as the objective lens which has the fine shape transcribe
  • the thickness ratio t / T is made larger than 4.0, while securing the thickness ratio t / T necessary for an objective lens compatible with BD, DVD, and CD, An objective lens having a fine shape transferred with high accuracy can be obtained. Further, by making the uneven thickness ratio t / T smaller than 9.0, even if the minimum thickness T of the neck portion becomes relatively small, it is possible to suppress or reduce the restriction on the amount of molten resin flowing into.
  • the deviation ratio t / T satisfies the following conditional expression (2). 4.0 ⁇ t / T ⁇ 5.0 (2)
  • the uneven thickness ratio t / T it is possible to further suppress or reduce the restriction on the amount of molten resin flowing, and to transfer the fine shape with higher accuracy.
  • the maximum thickness of the flange portion in the direction parallel to the lens optical axis is F (mm)
  • the minimum thickness of the neck portion in the direction parallel to the lens optical axis is set.
  • T (mm) is set, the flange ratio F / T satisfies the following conditional expression (3). 1.00 ⁇ F / T ⁇ 2.75 (3)
  • limiting of the flow amount of the molten resin from a flange part to a neck part is suppressed, and an unfilled state can be prevented more.
  • the flange ratio F / T 1.00 or more, the maximum thickness F of the flange portion does not become thinner than the minimum thickness T of the neck portion, and the molten resin flows from the flange portion to the neck portion. The amount can be secured. Further, by setting the flange ratio F / T to 2.75 or less, the flange portion does not become too thick, and turbulent flow can be prevented from occurring when the molten resin flows from the flange portion to the neck portion.
  • the weight is 0.003 g or more and 0.009 g or less.
  • the weight of the objective lens is the weight of the optical function part and the flange part after the gate cut. In this case, when the objective lens satisfies the weight in the above range, it can be a small-diameter objective lens.
  • the flange portion has a first flange surface on the first optical surface side and a second flange surface on the second optical surface side, and the second flange surface is the second optical surface. It is placed lower than the vertex.
  • the ratio of the maximum thickness F of the flange portion to the minimum thickness T of the neck portion becomes relatively small, and when the objective lens is formed, the molten resin flowing from the gate portion excessively suppresses or flows in the neck portion. The regulation can be prevented, and the deterioration of the optical performance in the vicinity of the neck portions of the first and second optical surfaces can be suppressed.
  • the outer periphery of the second optical surface is formed inside the outer periphery of the first optical surface.
  • the molten resin flows into the first optical surface side earlier than the second optical surface side, and the molten resin can easily flow to the first optical surface side.
  • the neck portion has a first end surface on the first optical surface side and a second end surface on the second optical surface side, and connects the first flange surface and the first end surface. At least one of the surfaces connecting the second flange surface and the second end surface is inclined with respect to the lens optical axis. In this case, the surface connecting the flange surface and the end surface becomes gentle, and the molten resin can smoothly flow into the neck portion.
  • At least one of the first end surface and the second end surface has a mirror surface.
  • the end surface is a mirror surface, the molten resin can flow smoothly when the objective lens is molded.
  • any one of the first flange surface and the second flange surface is disposed in the neck portion so as to be recessed from either the corresponding first end surface or second end surface.
  • the convex step portion of the neck portion that hinders the flow of the molten resin is eliminated during the molding of the objective lens, so the flow of the molten resin becomes a turbulent flow. Rather, it flows smoothly. Therefore, it is possible to suppress the deterioration of the optical performance in the vicinity of the neck portion of the first and second optical surfaces.
  • At least one of the first flange surface and the second flange surface has a step shape that changes the thickness in a direction parallel to the lens optical axis.
  • the inclined portion that is the boundary between the flange surface and the end surface becomes gentle, and the molten resin can smoothly flow into the neck portion.
  • the second end face has a convex mark for mold identification.
  • the objective lens since the objective lens has the above configuration, a mark that is difficult to be transferred with a small-diameter lens can be transferred with high accuracy.
  • a convex mark for mold identification is provided on the second flange surface.
  • the objective lens since the objective lens has the above configuration, a mark that is difficult to be transferred with a small-diameter lens can be transferred with high accuracy.
  • the thickness on the lens axis in the direction parallel to the lens optical axis of the objective lens is t (mm), and the focal length of the objective lens in a light beam having a wavelength of 500 nm or less is f (mm).
  • f the focal length of the objective lens in a light beam having a wavelength of 500 nm or less.
  • t / f the focal length of the objective lens in a light beam having a wavelength of 500 nm or less.
  • t / f is 1.0 ⁇ t / f ⁇ 1.8, which enables transfer with higher accuracy.
  • an objective lens manufacturing method includes an optical function unit having a fine shape on an optical surface and a flange unit provided around the optical function unit.
  • a method of manufacturing an objective lens which is injection-molded by a resin introduced into a mold space from a gate portion provided at a peripheral edge, and is used for recording and / or reproducing information on BD, DVD, and CD.
  • the thickness on the lens axis in the direction parallel to the lens optical axis is where t (mm) and the minimum thickness of the neck portion in the direction parallel to the lens optical axis is T (mm), the thickness ratio t / T indicating the degree of neck necking is as follows: Equation (1) is satisfied. 4.0 ⁇ t / T ⁇ 9.0 (1)
  • the thickness ratio t / T is relatively small even in an objective lens in which the lens outer diameter G satisfies 1.45 ⁇ G ⁇ 4.05.
  • the restriction of the amount of molten resin flowing in during the molding of the objective lens can be suppressed, and an unfilled state can be prevented.
  • an objective lens having a fine shape transferred with high accuracy can be manufactured.
  • a molding die according to the present invention has an optical function part having a fine shape on an optical surface, and a flange part provided around the optical function part, on the outer periphery of the flange part.
  • a molding die for molding an objective lens that is injection-molded by a resin introduced into a mold space from a provided gate and is used for reading and / or writing information on BD, DVD, and CD.
  • a first mold having a first transfer surface forming a first optical surface of the lens and a first molding surface forming a first flange surface extending around the first optical surface;
  • a second gold having a second transfer surface forming a second optical surface having a smaller curvature than the optical surface, and a second molding surface forming a second flange surface extending around the second optical surface.
  • an objective lens between the first transfer surface and the first molding surface.
  • the dimension of the mold space formed by the mold and the second mold is 1.45 ⁇ G ⁇ 4.05 when the lens outer diameter in the direction perpendicular to the lens optical axis is G (mm).
  • the thickness on the lens axis in the direction parallel to the lens optical axis is t (mm)
  • the minimum thickness of the neck portion in the direction parallel to the lens optical axis is T (mm).
  • the thickness deviation ratio t / T indicating the necking degree of the neck portion satisfies the following conditional expression (1).
  • the mold space has a shape obtained by inverting the contour of the objective lens. 4.0 ⁇ t / T ⁇ 9.0 (1)
  • the thickness ratio t / T is relatively small even in an objective lens whose lens outer diameter G satisfies 1.45 ⁇ G ⁇ 4.05.
  • the molding of the objective lens it is possible to suppress the limit of the amount of molten resin flowing in and prevent an unfilled state. Thereby, even an objective lens having a fine shape can be easily molded with high accuracy.
  • the second molding surface is from a die-matching surface of the first die and the second die rather than the apex of the second transfer surface. It is formed at a shallow position (a position relatively close to the axial direction).
  • the outer periphery of the second transfer surface is formed inside the outer periphery of the first transfer surface.
  • At least one of the surface connecting the first molding surface and the third molding surface and the surface connecting the second molding surface and the fourth molding surface is a lens optical axis. It is inclined with respect to.
  • one of the first molding surface and the second molding surface is disposed so as to be recessed from either the third molding surface or the fourth molding surface.
  • At least one of the first molding surface and the second molding surface has a step shape that changes the thickness in a direction parallel to the lens optical axis.
  • the fourth molding surface has a concave transfer surface for transferring a convex mark for mold identification.
  • the second molding surface has a concave transfer surface for transferring a convex mark for identifying a mold.
  • FIG. 1A is a partial side sectional view of the objective lens according to the first embodiment
  • FIG. 1B is a plan view of the second optical surface side of FIG. 1A
  • 1B is a partial side sectional view for explaining a molding die for forming the objective lens shown in FIG. 1A and the like.
  • FIG. It is a figure explaining the flow path space for resin supply, and the type
  • FIG. 4A is a partial side sectional view of the objective lens of the second embodiment
  • FIG. 4B is a partially enlarged view for explaining a molding die for forming the objective lens of FIG. 4A.
  • FIG. 5A is a partial side cross-sectional view of the objective lens of the third embodiment, and FIG.
  • FIG. 5B is a partially enlarged view for explaining a molding die for forming the objective lens of FIG. 5A.
  • FIG. 6A is a partial side cross-sectional view of the objective lens of the fourth embodiment, and FIG. 6B is a partially enlarged view for explaining a molding die for forming the objective lens of FIG. 6A.
  • 7A and 7B are diagrams illustrating a modification of the objective lens and the like shown in FIG. 6A and the like.
  • FIG. 8A is a partial side cross-sectional view of the objective lens of the fifth embodiment, and FIG. 8B is a partially enlarged view for explaining a molding die for forming the objective lens of FIG. 8A.
  • An objective lens 10 shown in FIGS. 1A and 1B is made of plastic and has a circular optical function part 11 having an optical function, an annular flange part 12 provided radially outward from the outer edge of the optical function part 11, and an optical An annular neck portion 13 is provided between the functional portion 11 and the flange portion 12.
  • FIG. 1A since the objective lens 10 has a symmetrical shape around the lens optical axis OA, only half of the objective lens 10 is shown and the remaining illustration is omitted.
  • This objective lens 10 is an objective lens with NA of 0.75 or more.
  • the objective lens 10 is, for example, a single-wave objective lens of a three-wavelength compatible type.
  • the objective lens 10 can read or write optical information corresponding to the BD (Blu-Ray Disc) standard with a wavelength of 405 nm and NA of 0.85, as well as a DVD (Digital Versatile Disc) and optical information corresponding to the CD (Compact Disc) standard with a wavelength of 780 nm and NA of 0.53 can be read or written.
  • BD Blu-Ray Disc
  • CD Compact Disc
  • the weight of the optical function part and the flange part after the gate cut of the objective lens 10 is 0.003 g or more and 0.009 g or less.
  • the optical function unit 11 of the objective lens 10 has a convex first optical surface OS1 having a relatively large curvature on the front side, and a convex second optical surface OS2 having a smaller curvature than the first optical surface OS1 on the back side.
  • the first optical surface OS1 is disposed on the side closer to the laser light source for writing (recording) or reading (reproducing) or reading and writing when the objective lens 10 is incorporated into an optical pickup device such as a notebook computer and operated. Is done.
  • the second optical surface OS2 is disposed to face a BD or the like that is an optical information recording medium when the objective lens 10 is incorporated in an optical pickup device and operated.
  • the first optical surface OS1 is provided with a fine structure or fine shape FS that is a diffractive structure.
  • the fine shape FS is formed in a concentric annular zone, and the outermost periphery thereof reaches a position near the outer edge of the optical function unit 11.
  • the second optical surface OS2 is a mirror surface having no diffractive structure.
  • the diffractive structure referred to in this specification is a general term for structures that have a step and have a function of converging or diverging a light beam by diffraction.
  • a plurality of unit shapes are arranged around the optical axis, and a light beam is incident on each unit shape, and the wavefront of the transmitted light is shifted between adjacent annular zones, resulting in new It includes a structure that converges or diverges light by forming a simple wavefront.
  • the diffractive structure preferably has a plurality of steps, and the steps may be arranged with a periodic interval in the direction perpendicular to the optical axis, or may be arranged with a non-periodic interval in the direction perpendicular to the optical axis.
  • the objective lens provided with a diffractive structure is a single aspherical lens
  • the incident angle of the light beam on the objective lens differs depending on the height from the optical axis. It becomes.
  • the objective lens is a single aspherical convex lens, even if it is a diffractive structure that generates diffracted light of the same diffraction order, generally, the distance from the optical axis tends to increase.
  • the diffractive structure has a plurality of concentric annular zones around the optical axis.
  • the diffractive structure can have various cross-sectional shapes (cross-sectional shapes on the plane including the optical axis), and the cross-sectional shape including the optical axis is a blaze structure, a staircase structure, or a staircase structure and a blaze structure. There is a structure in which is superimposed.
  • the minimum value of the pitch of the diffractive structure is preferably 2.4 ⁇ m or more and 10 ⁇ m or less.
  • the maximum value of the pitch of the diffractive structure is preferably 110 ⁇ m or less.
  • the pitch is the length of the unit diffraction structure in the direction perpendicular to the optical axis.
  • the total number of annular zones of the diffractive structure in the entire objective lens is 150 or more and 250 or less.
  • the total number of ring zones of the diffractive structure in the entire objective lens is large, such as 150 or more and 250 or less, the problem of imperfect transfer is further increased, and the present invention is more useful. .
  • the flange portion 12 is an annular protruding portion 14 provided on the radially outer side of the neck portion 13.
  • the protruding portion 14 is a portion that is relatively thicker than the neck portion 13.
  • the protruding portion 14 protrudes from the neck portion 13 toward the laser light source, that is, the first optical surface OS1, and also protrudes toward the optical information recording medium, that is, the second optical surface OS2.
  • the protruding portion 14 has, on the first optical surface OS1 side, a first flange surface 12a perpendicular to the lens optical axis OA and an inner diameter surface 14a facing the fine shape FS (first optical surface OS1) of the optical function unit 11.
  • the inner diameter surface 14a is a surface that connects the first flange surface 12a and a first end surface EP1 of the neck portion 13 described later
  • the inner diameter surface 14b is the second flange surface 12b and the second end surface EP2 of the neck portion 13. It is a surface to connect.
  • the inner diameter surface 14a extends at an angle with respect to the lens optical axis OA and has a tapered shape spreading toward the laser light source side, and the inner diameter surface 14b extends at an angle with respect to the lens optical axis OA, It has a taper shape spreading toward the information recording medium.
  • the outer diameter surface 14c extends in parallel to the lens optical axis OA and has a cylindrical shape.
  • the first and second flange surfaces 12a and 12b are flat surfaces extending perpendicular to the lens optical axis OA.
  • the first flange surface 12a is disposed lower than the vertex Q1 of the first optical surface OS1
  • the second flange surface 12b is disposed lower than the vertex Q2 of the second optical surface OS2. That is, the first and second optical surfaces OS1 and OS2 protrude beyond the first and second flange surfaces 12a and 12b.
  • the neck part 13 is a thinner part than the optical function part 11 and the flange part 12.
  • a ring-shaped first end surface EP1 perpendicular to the optical axis OA is formed on the laser light source side of the neck portion 13, that is, the first optical surface OS1, and on the optical information recording medium side, that is, the second optical surface OS2 side.
  • a second end surface EP2 having an annular shape perpendicular to the optical axis OA is formed.
  • the first and second end surfaces EP1, EP2 are mirror surfaces.
  • the boundary between the second optical surface OS2 and the second end surface EP2 (the outer periphery of the second optical surface OS2) is inward of the boundary between the first optical surface OS1 and the first end surface EP1 (the outer periphery of the first optical surface OS1).
  • the first end surface EP1 or the second end surface EP2 has a region formed of a flat surface that regularly reflects collimated light, for example, and is used when the objective lens 10 is aligned.
  • the objective lens 10 satisfies 1.45 ⁇ G ⁇ 4.05 when the lens outer diameter in the direction perpendicular to the lens optical axis OA is G (mm) (see FIG. 1B).
  • the lens outer diameter G of the objective lens 10 is more preferably 2.95 ⁇ G ⁇ 4.05. This is because a larger lens outer diameter G can make the cross-sectional area of the neck portion 13 larger, which is advantageous for resin filling.
  • the thickness on the lens axis in the direction parallel to the lens optical axis OA is t (mm) (see FIG. 1A)
  • the minimum of the neck unit 13 in the direction parallel to the lens optical axis OA is
  • the thickness deviation ratio t / T indicating the necking degree of the neck portion 13 satisfies the following conditional expression (1).
  • the thickness t on the lens axis is the thickness of the thickest portion of the optical function unit 11 that is parallel to the lens optical axis OA.
  • the uneven thickness ratio t / T more preferably satisfies the following conditional expression (2). 4.0 ⁇ t / T ⁇ 5.0 (2)
  • the maximum thickness of the flange portion 12 in the direction parallel to the lens optical axis OA is F (mm)
  • the minimum thickness of the neck portion 13 in the direction parallel to the lens optical axis OA is set.
  • T (mm) the flange ratio F / T satisfies the following conditional expression (3). 1.00 ⁇ F / T ⁇ 2.75 (3)
  • the flange ratio F / T more preferably satisfies the following conditional expression (4). 1.00 ⁇ F / T ⁇ 2.00 (4)
  • the objective lens 10 has a thickness on the lens axis in a direction parallel to the lens optical axis OA as t (mm), and a focal length of the objective lens 10 in a light beam having a wavelength of 500 nm or less as f (mm). 0.8 ⁇ t / f ⁇ 2.0, preferably 1.0 ⁇ t / f ⁇ 1.8.
  • the objective lens 10 in which t / f satisfies the above range has a relatively large lens axis thickness t in a direction parallel to the lens optical axis OA.
  • the illustrated mold 40 includes a movable mold 41 as a first mold and a fixed mold 42 as a second mold.
  • the movable mold 41 is driven by the mold opening / closing drive device 51 and can move forward and backward in the AB direction which is the axial direction of the movable mold 41, and can be opened and closed with the fixed mold 42.
  • a mold space for injection molding can be formed as will be described in detail below by clamping the molds 41 and 42 together with the parting surfaces PS1 and PS2.
  • the mold space CV corresponds to the shape of the objective lens 10 shown in FIG. 1A and the like.
  • the flow path space FC is a space corresponding to the runner portion RP of the molded product before the objective lens 10 is separated, and the gate portion GS is a space corresponding to the gate portion GP of the molded product.
  • the gate portion GP is completely removed by finishing.
  • the mold space CV includes a main body space CV1, a flange space CV2, and a neck space CV3.
  • the main body space CV1 is defined by the first and second transfer surfaces S1, S2, and the flange space CV2 is the third, fourth, fifth, sixth, and seventh transfer surfaces S3, S4, S5, S6, S7.
  • the neck space CV3 is defined by the eighth and ninth transfer surfaces S8 and S9.
  • the pair of opposing first and second transfer surfaces S1 and S2 facing the main body space CV1 form the first and second optical surfaces OS1 and OS2 of the optical function unit 11 in the center of the objective lens 10, respectively. This corresponds to the end faces of core dies 64a and 74a described later.
  • the outer periphery of the second transfer surface S2 is formed inside the outer periphery of the first transfer surface S1.
  • the first transfer surface S1 is deeper and has a larger curvature than the second transfer surface S2. Further, a mold surface portion S11 corresponding to the fine shape FS of the objective lens 10 is provided on the first transfer surface S1.
  • a pair of opposing third and fourth transfer surfaces S3 and S4 facing the flange space CV2 are first and second for forming the first and second flange surfaces 12a and 12b of the flange portion 12 of the objective lens 10, respectively. 2 corresponding to the end surfaces of the outer peripheral molds 64b and 74b described later.
  • the fifth and sixth transfer surfaces facing the flange space CV2 are for forming the inner diameter surfaces 14a and 14b of the flange portion 12, respectively, and correspond to the end surfaces of the outer peripheral molds 64b and 74b.
  • the fifth and sixth transfer surfaces S5 and S6 are formed to be inclined with respect to the lens optical axis OA of the objective lens 10.
  • the seventh transfer surface S7 facing the flange space CV2 is for forming the outer diameter surface 14c of the objective lens 10, and corresponds to the end surfaces of the outer peripheral molds 64b and 74b.
  • the fourth transfer surface S4 is formed at a shallow position that is not so far from the parting surface PS2 than the vertex Q2 of the second transfer surface S2.
  • a pair of opposed eighth and ninth transfer surfaces S8, S9 facing the neck space CV3 are the third and fourth for forming the first and second end surfaces EP1, EP2 of the neck portion 13 of the objective lens 10, respectively. And corresponds to the end surfaces of the outer peripheral molds 64b and 74b.
  • the eighth and ninth transfer surfaces S8, S9 are flat surfaces so that the first and second end surfaces EP1, EP2 of the neck portion 13 are mirror surfaces.
  • the movable mold 41 on the movable side includes a mold plate 61 that forms the parting surface PS ⁇ b> 1, a receiving plate 62 that supports the mold plate 61 from behind, and an attachment plate that supports the receiving plate 62 from behind.
  • a core mold 64a as a mold insert that forms the mold space CV (particularly the main body space CV1) shown in FIG. 3, and a peripheral part that forms the mold space CV (particularly the flange space CV2 and the neck space CV3).
  • an outer peripheral mold 64b is an outer peripheral mold 64b.
  • the movable mold 41 has a protruding pin 65 that protrudes and releases the runner portion RP of the molded product before separating the objective lens 10, a movable rod 67a that pushes the core mold 64a from the back, and the protruding pin 65 behind.
  • a movable rod 67b that pushes from the front and a movable member 67 that moves the movable rods 67a and 67b back and forth.
  • the core mold 64a is driven by the advancing movable rod 67a to advance toward the fixed mold 42, and automatically retracts and returns to the original position as the movable rod 67a retracts.
  • the ejecting pin 65 is driven by the moving movable rod 67b to move forward to the fixed mold 42 side, and automatically retracts and returns to the original position as the movable rod 67b moves backward.
  • the advancing / retracting member 68 is driven by the advancing / retreating drive device 52 and moves forward and backward in the AB direction at an appropriate timing and amount.
  • a mold plate 61 which is a mold part on the mold surface side, includes a runner recess 61b that forms a runner portion RP shown in FIG. 1A, a gate recess 61c that forms a gate portion GP, and an outer periphery mold 64b. And through holes 61e and 61f provided for inserting the protruding pins 65, respectively.
  • the fixed mold 42 on the fixed side forms a mold plate 71 that forms the parting surface PS2, a mounting plate 72 that supports the mold plate 71 from behind, and a mold space CV (particularly a main body space CV1) shown in FIG.
  • a core die 74a as a mold insert and an outer peripheral die 74b as a peripheral part forming a die space CV (particularly, a flange space CV2 and a neck space CV3) are provided.
  • a mold plate 71 which is a mold part on the mold surface side includes a runner recess 71b for forming a runner portion RP shown in FIG. 1A, a gate surface 71c for forming a gate portion GP, and an outer peripheral die 74b. And a through hole 71e provided for the insertion.
  • the mold space CV has a shape obtained by inverting the contour of the objective lens 10, and the dimensions of the mold space CV correspond to the dimensions of the objective lens 10 described above. That is, when the lens outer diameter in the direction perpendicular to the lens optical axis OA is G (mm) (see FIG. 1B), 1.45 ⁇ G ⁇ 4.05, which corresponds to the optical function unit 11.
  • the thickness on the lens axis in the direction parallel to the lens optical axis OA is t (mm)
  • the neck space CV3 corresponding to the neck portion 13, the minimum thickness of the neck portion in the direction parallel to the lens optical axis OA.
  • the uneven thickness ratio t / T indicating the degree of necking of the neck portion 13 satisfies the following conditional expression (1).
  • the uneven thickness ratio t / T more preferably satisfies the following conditional expression (2).
  • the maximum thickness of the flange portion 12 in the direction parallel to the lens optical axis OA is F (mm)
  • the neck space CV3 corresponding to the neck portion 13 the lens optical axis OA.
  • the flange ratio F / T satisfies the following conditional expression (3), where T (mm) is the minimum thickness of the neck portion 13 in the direction parallel to. 1.00 ⁇ F / T ⁇ 2.75 (3)
  • the flange ratio F / T more preferably satisfies the following conditional expression (4). 1.00 ⁇ F / T ⁇ 2.00 (4)
  • the molten resin passes through the gate portion GS in the molding of the objective lens 10
  • the molten resin that comes into contact with the mold surface such as the wall surface of the gate portion GS is the first and second gold. Cooled by the molds 41 and 42, the viscosity increases. Therefore, the molten resin substantially flows only through the central portion of the gate portion GS and flows into the mold space CV.
  • the conditional expression (1) in the mold space CV the molten resin can be fully filled in the mold space CV without requiring an excessive injection pressure. Thereby, it is possible to prevent optical performance deterioration due to unfilling due to insufficient injection pressure and excessive pressure.
  • the objective lens 10 for a small pickup device such as a notebook personal computer has a lens outer diameter G of 1.45 ⁇ G ⁇ 4.05.
  • the cross-sectional area of the neck portion 13 is relatively small, and it is necessary to prevent the molten resin from flowing in the neck portion 13.
  • the mold space CV dimension of the objective lens 10
  • the mold space CV dimension of the objective lens 10
  • the lens outer diameter G is 1.45 (mm) or more, it is possible to prevent the fine shape provided on the lens optical surface from becoming too small, and thus it is possible to perform transfer with higher accuracy. Become.
  • the movable mold 41 and the fixed mold 42 are appropriately heated by a mold temperature controller (not shown). Thereby, the temperature of the mold part that forms the mold space CV in both molds 41 and 42 is set to a temperature state suitable for molding.
  • the mold opening / closing drive device 51 is operated, the movable mold 41 is advanced to the fixed mold 42 side to close the mold, and the closing operation of the mold opening / closing drive device 51 is further continued.
  • the mold is clamped to clamp the fixed mold 42 with a necessary pressure.
  • the molten resin is injected into the mold space CV between the clamped movable mold 41 and the fixed mold 42 with a necessary pressure through the gate portion GS or the like. Let the injection to inject. 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.
  • the mold opening / closing drive device 51 is operated to retract the movable mold 41 and perform mold opening to separate the movable mold 41 from the fixed mold 42. As a result, the objective lens 10, which is a molded product, is released from the fixed mold 42 while being held by the movable mold 41.
  • the advancing / retreating drive device 52 is operated, and the objective lens 10 is projected by the core mold 64a and the ejection pin 65 via the movable rods 67a and 67b.
  • the objective lens 10 is urged by the movable rod 67a or the like and pushed out toward the fixed mold 42, and the objective lens 10 is released from the movable mold 41.
  • the objective lens 10 released from both molds 41 and 42 is carried out of the molding apparatus by gripping a sprue portion extending from the runner portion RP of the objective lens 10.
  • the objective lens 10 after being carried out is subjected to external processing such as removal of the gate portion GP to be a product for shipment.
  • the mold closing process from the mold closing process to the unloading process is repeated in the molding apparatus.
  • the objective lens 10 satisfying the conditional expression (1) satisfies the lens outer diameter G of 1.45 ⁇ G ⁇ 4.05.
  • the thickness deviation ratio t / T becomes relatively small, so that the restriction of the amount of molten resin flowing into the objective lens 10 can be suppressed and the unfilled state can be prevented.
  • the objective lens 10 having the fine shape FS transferred with high accuracy can be manufactured.
  • the thickness ratio t / T necessary for the objective lens 10 having compatibility with BD, DVD, and CD is secured.
  • the objective lens 10 having the fine shape FS transferred with high accuracy can be obtained.
  • by making the uneven thickness ratio t / T smaller than 9.0 even if the minimum thickness T of the neck portion 13 becomes relatively small, it is possible to suppress the restriction on the amount of molten resin flowing into the neck portion 13.
  • Light utilization efficiency is defined as the ratio of the amount of light of the spot light that has passed through the objective lens and collected with respect to the amount of light incident on the optical surface of the objective lens that is the target optical lens. is there.
  • the light utilization efficiency is obtained by using, for example, a measuring device similar to a microscope, and without using an objective lens as a test lens, that is, using a light amount value L1 in a state without a test lens as a reference as an eyepiece. It is calculated by measuring with a power meter arranged at the corresponding position, and then measuring the light amount value L2 in the same manner with the lens to be tested, and setting L2 ⁇ L1 ⁇ 100 [%] from both measurement results.
  • a measuring device similar to a microscope and without using an objective lens as a test lens, that is, using a light amount value L1 in a state without a test lens as a reference as an eyepiece. It is calculated by measuring with a power meter arranged at the corresponding position, and then measuring the light amount value L2 in the same manner with the lens to be tested, and setting L2 ⁇ L1 ⁇ 100 [%] from both measurement results.
  • a power meter arranged at the corresponding position
  • BD light (wavelength 405 nm), DVD light (wavelength 660 nm), and CD light (wavelength 785 nm) are used.
  • Table 1 shows the test results of the above test regarding the relationship between the external dimensions of the objective lens and the optical performance.
  • ⁇ indicates that the optical performance, particularly “light utilization efficiency” is good, and “ ⁇ ” indicates that the optical performance, particularly “light utilization efficiency” is further than “ ⁇ ”. It indicates that the value is good and is a value near the center of the standard, “XX” indicates that a transfer failure occurs on the optical surface, and “light utilization efficiency” is out of the standard. “X” indicates that the area of the optical surface is insufficient in optical design, and “aberration performance” cannot be measured.
  • the optical performance of the objective lens 10 is “good” because the deviation ratio t / T is 8.00, 7.20, 6.55, 5.14, 4.80, 4 .24. These satisfy the conditional expression (1). Further, when the thickness deviation ratio t / T was 4.80, 4.24, the conditional expression (2) was satisfied, and the optical performance was particularly good.
  • Table 2 shows test results regarding the relationship between the deviation ratio t / T of the objective lens 10 and the optical performance. The evaluation of the test results is the same as in Example 1.
  • the optical performance of the objective lens 10 is “good” because the deviation ratio t / T is 8.84, 8.40, 5.60, 5.09, 4.94, 4 .42, 4.10. These satisfy the conditional expression (1). Further, when the thickness ratio t / T was 4.94, 4.42, 4.10, the conditional expression (2) was satisfied, and the optical performance was particularly good.
  • Table 3 shows test results regarding the relationship between the thickness deviation ratio t / T of the objective lens 10 and the optical performance. The evaluation of the test results is the same as in Example 1.
  • the optical performance of the objective lens 10 is “good” because the deviation ratio t / T is 8.75, 8.08, 7.24, 5.12, 5.00, 4 .67, 4.20, 4.04. These satisfy the conditional expression (1). Further, when the thickness deviation ratio t / T was 5.00, 4.67, 4.20, 4.04, the conditional expression (2) was satisfied and the optical performance was particularly good.
  • Table 4 shows the test results regarding the relationship between the flange ratio F / T of the objective lens 10 and the optical performance.
  • the evaluation of the test results indicates that “XX” indicates that a transfer failure has occurred on the optical surface, “ ⁇ ” indicates that the area of the optical surface is insufficient for optical design, and “ ⁇ ”.
  • “ ⁇ ” indicates that the optical performance is good, and “ ⁇ ” indicates that the optical performance is better than “ ⁇ ”.
  • “ ⁇ ” indicates that the optical performance is better than “ ⁇ ”.
  • the optical performance of the objective lens 10 is “good” when the flange ratio F / T is 2.20, 2.00, 1.29, 1.10, 1.00. there were. These satisfy the conditional expression (3). Further, when the flange ratio F / T was 2.00, 1.29, 1.10, 1.00, the conditional expression (4) was satisfied, and the optical performance was particularly good.
  • the optical performance of the objective lens 10 is “good” when the flange ratio F / T is 2.750, 2.063, 1.980, 1.414, 1.238. there were. These satisfy the conditional expression (3). Further, when the flange ratio F / T was 1.980, 1.414, and 1.238, the conditional expression (4) was satisfied, and the optical performance was particularly good.
  • the first flange surface 12 a is disposed so as to be recessed from the first end surface EP ⁇ b> 1 of the neck portion 13. That is, the protruding portion 214 of the flange portion 212 has a shape in which only the optical information recording medium side, that is, the second optical surface OS2 side protrudes.
  • the inner diameter surface 214a has a tapered shape that narrows on the laser light source side.
  • the molding die 40 for molding the objective lens 210 corresponds to the dimensions of the objective lens 210.
  • the fifth transfer surface S5 is formed so as to be inclined with respect to the lens optical axis OA corresponding to the inner diameter surface 214a of the flange portion 212.
  • the convex portion of the neck portion 13 that obstructs the flow of the molten resin is eliminated in the neck portion 13 on the first optical surface OS1 side where the first flange surface 12a is recessed.
  • turbulent flow due to obstruction of the flow of the molten resin does not occur, and the objective lens 210 flows smoothly. Therefore, it is possible to suppress the deterioration of the optical performance in the vicinity of the neck portion 13 of the first and second optical surfaces OS1, OS2.
  • the objective lens of the third embodiment is a modification of the objective lens of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
  • the second flange surface 12b has a step shape 315 that changes the thickness in the direction parallel to the lens optical axis OA.
  • the step shape 315 is formed in two steps on the inner diameter surface 14 b of the flange portion 312. Specifically, a first step 315a is formed on the inner side of the second flange surface 12b, that is, on the optical function unit 11 side, and a second step 315b is disposed on the outer side of the second flange surface 12b adjacent to the first step 315a. Is formed.
  • the first step portion 315a is provided at a position far from the information recording medium side
  • the second step portion 315b is provided at a position closer to the information recording medium side than the first step portion 315a. That is, the step shape 315 has a staircase shape in which the flange thickness increases toward the outside of the flange portion 12.
  • a surface 315c connecting the first step portion 315a and the second step portion 315b is a tapered surface extending toward the information recording medium side.
  • a surface 315d adjacent to the inside of the first step portion 315b is a tapered surface extending toward the information recording medium side.
  • the molding die 40 for molding the objective lens 310 corresponds to the dimensions of the objective lens 310.
  • the sixth transfer surface S6 is formed with a step-shaped transfer surface ST1 corresponding to the step shape 315 of the flange portion 312.
  • the step shape 315 that is an inclined portion that is the boundary between the second flange surface 12b and the second end surface EP2 becomes gentle, and the molten resin is more smoothly formed when the objective lens 310 is molded. Can flow into the neck portion 13.
  • a step shape 315 may be provided on the first flange surface 12a.
  • the objective lens and the like according to the fourth embodiment will be described below.
  • the objective lens of the fourth embodiment is a modification of the objective lens of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
  • the neck portion 13 of the present embodiment has a convex mark M for mold identification on the second end face EP2.
  • the mark M is substantially hemispherical, and is arranged near the boundary between the neck portion 13 and the optical function portion 11 on the information recording medium side.
  • the mark M is also obtained by satisfying the conditional expression (1). Transfer with high accuracy.
  • the place where the mark M is arranged is not limited to the second end surface EP2, but may be arranged on the second flange surface 12b as shown in FIG. 7A.
  • the molding die 40 for molding the objective lens 410 corresponds to the dimensions of the objective lens 410.
  • the ninth transfer surface S9 is formed with a concave transfer surface PT corresponding to the mark M of the neck portion 13.
  • the concave transfer surface PT is formed on the fourth transfer surface S4 as shown in FIG. 7B.
  • the objective lens and the like according to the fifth embodiment will be described below.
  • the objective lens of the fifth embodiment is a modification of the objective lens of the second embodiment, and parts not specifically described are the same as those of the second embodiment.
  • the first flange surface 12a has a step shape 515 that changes the thickness parallel to the lens optical axis OA.
  • the step shape 515 is formed in two steps on the inner diameter surface 14 a of the flange portion 512. Specifically, a first step 515a is formed on the inner side of the first flange surface 12a, that is, on the optical function unit 11 side, and a second step 515b is disposed on the outer side of the first flange surface 12a adjacent to the first step 515a. Is formed.
  • the first step portion 515a is provided at a position closer to the laser light source side, and the second step portion 515b is provided at a position farther from the laser light source side than the first step portion 515a. That is, the step shape 515 has a stepped shape in which the flange thickness decreases toward the outside of the flange portion 12.
  • a surface 515c that connects the first step portion 515a and the second step portion 515b is a tapered surface that narrows toward the laser light source side.
  • a surface 515d adjacent to the outside of the second step portion 515b is a surface in a direction parallel to the lens optical axis OA.
  • a step shape 515 may be provided on the second flange surface 12b.
  • the molding die 40 for molding the objective lens 510 corresponds to the dimensions of the objective lens 510.
  • a step-shaped transfer surface ST2 corresponding to the step shape 515 of the flange portion 512 is formed on the fifth transfer surface S5.
  • the shape of the mold space CV provided in the injection mold constituted by the fixed mold 42 and the movable mold 41 may be various shapes as long as the conditional expression (1) is satisfied. can do. That is, the shape of the mold space CV formed by the core molds 64a and 74a is merely an example, and can be appropriately changed according to the purpose of the objective lens 10 and other optical elements.
  • the first optical surface OS1 of the objective lens 10 may be molded with the fixed mold 42, and the second optical surface OS2 having a smaller curvature than the first optical surface OS1 may be molded with the movable mold 41. it can.
  • the fine shape FS formed in the optical function unit 11 of the objective lens 10 is not limited to the illustrated one, and various diffractive structures and the like according to applications can be used.
  • the second flange surface 12b is arranged lower than the vertex Q2 of the second optical surface OS2, but if the molten resin flow at the neck portion 13 is not hindered, The second flange surface 12b may be disposed higher than the vertex Q2 of the second optical surface OS2. That is, the second flange surface 12b may protrude beyond the second optical surface OS2.
  • the outer periphery of the second optical surface OS2 is formed inside the outer periphery of the first optical surface OS1, but the outer periphery of the second optical surface OS2 is the same as the outer periphery of the first optical surface OS1. They may be formed at substantially the same position on the vertical line. Moreover, you may form outside the outer periphery of 1st optical surface OS1.
  • 1st and 2nd end surface EP1, EP2 of the neck part 13 had a mirror surface, it does not need to be a mirror surface. Moreover, it is good also considering either one of 1st and 2nd end surface EP1, EP2 as a mirror surface.

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

Abstract

La présente invention vise à fournir une lentille de focalisation qui réduit au maximum la limitation de la quantité de résine fondue qui s'écoule dans l'espace d'un moule correspondant à une section à fonction optique d'une lentille, et qui peut bénéficier du transfert à haute précision d'une forme fine ou autre. Le respect de l'expression conditionnelle (1) : permet de rendre assez faible le rapport de l'écart d'épaisseur t/T dans une lentille de focalisation (10), même lorsque le diamètre extérieur G de la lentille de focalisation est tel que 1,45 ≤ G ≤ 4,05 ; réduit au maximum la limitation de la quantité de résine fondue s'écoulant vers l'intérieur lorsque la lentille de focalisation (10) est moulée ; et permet d'éviter le non-remplissage. Il est par conséquent possible de fabriquer une lentille de focalisation (10) ayant une forme fine qui a été transférée avec une haute précision.
PCT/JP2012/058230 2011-03-28 2012-03-28 Lentille de focalisation, procédé de fabrication d'une lentille de focalisation et matrice de moulage WO2012133578A1 (fr)

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WO2016021577A1 (fr) * 2014-08-08 2016-02-11 株式会社ダイセル Article moulé en résine époxy de forme spéciale, et dispositif optique comportant cet article
AU2013321207B2 (en) * 2012-09-28 2017-03-30 Suntory Holdings Limited Monomeric proanthocyanidin-removed plant extract

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WO2010087068A1 (fr) * 2009-01-30 2010-08-05 コニカミノルタオプト株式会社 Lentille et matrice de moulage
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JP2010186550A (ja) * 2002-11-26 2010-08-26 Hitachi Maxell Ltd プラスチックレンズ及び光ピックアップ装置
WO2010116804A1 (fr) * 2009-03-30 2010-10-14 コニカミノルタオプト株式会社 Lentille

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JP2010186550A (ja) * 2002-11-26 2010-08-26 Hitachi Maxell Ltd プラスチックレンズ及び光ピックアップ装置
JP2008287757A (ja) * 2007-05-15 2008-11-27 Konica Minolta Opto Inc 光ピックアップ装置及び対物レンズユニット
JP2009277311A (ja) * 2008-05-16 2009-11-26 Fujinon Corp 対物レンズ、光ピックアップ装置、光記録・再生装置
WO2010087068A1 (fr) * 2009-01-30 2010-08-05 コニカミノルタオプト株式会社 Lentille et matrice de moulage
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AU2013321207B2 (en) * 2012-09-28 2017-03-30 Suntory Holdings Limited Monomeric proanthocyanidin-removed plant extract
WO2016021577A1 (fr) * 2014-08-08 2016-02-11 株式会社ダイセル Article moulé en résine époxy de forme spéciale, et dispositif optique comportant cet article
CN106662679A (zh) * 2014-08-08 2017-05-10 株式会社大赛璐 具有特殊形状的环氧树脂成型物、以及具备该成型物的光学装置
JPWO2016021577A1 (ja) * 2014-08-08 2017-05-25 株式会社ダイセル 特殊形状を有するエポキシ樹脂成形物、及びそれを備えた光学装置
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JP2019014909A (ja) * 2014-08-08 2019-01-31 株式会社ダイセル 特殊形状を有するエポキシ樹脂成形物、及びそれを備えた光学装置
US10843423B2 (en) 2014-08-08 2020-11-24 Daicel Corporation Specially-shaped epoxy resin molded article, and optical device provided with same

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