WO2012043190A1 - Method for manufacturing lens - Google Patents

Method for manufacturing lens Download PDF

Info

Publication number
WO2012043190A1
WO2012043190A1 PCT/JP2011/070527 JP2011070527W WO2012043190A1 WO 2012043190 A1 WO2012043190 A1 WO 2012043190A1 JP 2011070527 W JP2011070527 W JP 2011070527W WO 2012043190 A1 WO2012043190 A1 WO 2012043190A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
gate
manufacturing
optical
gate portion
Prior art date
Application number
PCT/JP2011/070527
Other languages
French (fr)
Japanese (ja)
Inventor
菅忍
Original Assignee
コニカミノルタオプト株式会社
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 コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Priority to JP2012536314A priority Critical patent/JPWO2012043190A1/en
Publication of WO2012043190A1 publication Critical patent/WO2012043190A1/en

Links

Images

Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a method for manufacturing a lens incorporated in an optical pickup device or the like for recording and / or reproducing information.
  • a lens used in an optical pickup device or the like there is a lens provided with a side gate formation portion (so-called gate portion) so as to protrude from a part of a flange portion constituting the outer periphery of an optical function portion (Patent Document 1). FIG. 1 etc.).
  • a gate portion extending in a column shape in the lateral direction from the flange portion is formed, and even if the gate portion is excised so as to leave a part, or even the flange portion is excised, the gate portion is excised.
  • the performance of the optical function part is affected at the time of mold release, and the influence on the optical function part may be changed whenever the dimensions of the gate part are changed.
  • the size of lenses has been reduced, and there is a concern that the optical performance due to the cutting of the gate portion may be seriously affected.
  • An object of the present invention is to provide a method of manufacturing a lens that can reduce the influence on the optical performance due to the cutting of the gate portion.
  • a method for manufacturing a lens according to the present invention includes forming a molded product including a lens body having a pair of optical surfaces and a gate extending from a part of the outer periphery of the lens body by injection molding. And a step of forming a finish convex portion by partially cutting the gate portion, wherein the gate portion has a step along a direction perpendicular to the optical axis of the lens body portion. To do.
  • the gate portion since the gate portion has a step along the direction perpendicular to the optical axis of the lens body, the cross-sectional size of the gate portion can be adjusted closer to the runner portion than the step. In this case, the influence of the cutting of the gate portion or the like hardly affects the optical performance of the lens main body portion, and the manufacturing conditions relating to the gate and the like can be easily adjusted.
  • the step is changed by changing at least one of a horizontal width parallel to a reference plane perpendicular to the optical axis and a vertical width parallel to the optical axis. Is formed. In this case, it is easy to form a step.
  • the gate part is provided on the lens body part side with the step as a boundary, and the first part having a large cross-sectional size, and the second part provided on the runner part side with the step as a boundary, Have
  • the cross-sectional size of the gate portion is increased on the lens body side, and the shape of the gate portion is stabilized.
  • the injection molding conditions of the lens are adjusted by changing the cross-sectional size of the second portion.
  • various conditions such as a resin flow rate at the time of injection molding can be easily adjusted at a portion away from the lens body.
  • the finish convex portion is formed on the lens main body side of the step.
  • a gate portion ie, a finish convex portion
  • the remaining marks are constant regardless of the adjustment of the manufacturing conditions regarding the gate.
  • the lens is incorporated into an optical pickup device for recording and / or reproducing information on an optical disc.
  • the lens since the lens is small, it is particularly important that the influence of the cutting off of the gate portion does not easily affect the optical performance of the lens body and that the manufacturing conditions relating to the gate and the like can be easily adjusted. become.
  • the lens is incorporated in an optical pickup device for BD (Blu-ray Disc).
  • BD coupling lenses, objective lenses, etc. are compact and have strict specifications on optical characteristics.
  • the effect of cutting off the gate is difficult to affect the optical performance of the lens body, making it easy to adjust the manufacturing conditions related to the gate. Therefore, a high-performance lens can be provided stably.
  • the diameter of the lens body is 1.6 mm or more and 3.5 mm or less.
  • the lens body has a diameter of 1.6 mm or more, and the influence of the gate part cutting is likely to appear when the diameter is 3.5 mm or less.
  • the projection length of the finish convex portion from the outer periphery of the lens body is 0.06 mm or more and 0.35 mm or less.
  • (A) And (B) is the top view and side view explaining the external appearance of the molded article which is a process target in the manufacturing method of the lens which concerns on 1st Embodiment.
  • (A) And (B) is a side view explaining the intermediate
  • (C) And (D) is a side view explaining the external appearance of the lens after a finishing process,
  • (E) are top views explaining the lens after a finishing process.
  • (A) to (E) are plan views for explaining a molded product to be processed in the manufacturing method of the second embodiment.
  • (A) And (B) is a side view explaining the molded article which is a process target in the manufacturing method of 3rd Embodiment. It is a side view explaining the molded article which is a process target in the manufacturing method of 4th Embodiment.
  • a molded product 100 taken out from an injection mold includes a lens body 11 and a two-stage gate 12 extending from a part of the outer periphery thereof. , And a runner portion 16 connected to the tip of the gate portion 12.
  • the base 10 of the gate portion 12 is finished by partially cutting the gate portion 12 in the lens 10 as a product after cutting the gate portion. It remains as a convex portion 14.
  • the lens body 11 of the molded product 100 has a circular optical function unit 21 in plan view and extends from the optical function unit 21 in the outer diameter direction. And an annular flange portion 22.
  • the optical function unit 21 is a coupling lens, an objective lens, or the like disposed on the optical path in the optical pickup device, and performs parallelization, convergence, and the like of the laser light.
  • the optical function unit 21 includes a convex first optical surface 21a and a convex second optical surface 21b. That is, the illustrated optical function unit 21 is thick on the center side through which the optical axis OA passes.
  • the flange portion 22 is a bowl-shaped portion for supporting the lens 10 from the periphery, and is connected to the outer periphery of the optical function portion 21.
  • the flange portion 22 has a flat first flange surface 22a, a flat second flange surface 22b, and a cylindrical side surface 22c.
  • the first flange surface 22a extends adjacent to the outside of the first optical surface 21a
  • the second flange surface 22b extends adjacent to the outside of the second optical surface 21b
  • both flange surfaces 22a and 22b are arranged substantially parallel to each other.
  • the size of the lens body 11 described above is appropriately set depending on the application, but in the case of an optical element for an optical pickup device, the diameter d is usually in the range of 1.6 mm to 3.5 mm.
  • the gate portion 12 is a constricted portion sandwiched between the lens main body portion 11 and the runner portion 16, and extends in a radial direction from a part of the side surface 22 c provided on the outer periphery of the lens main body portion 11.
  • the gate portion 12 is not a simple column or rod, but has a step 12c at one location along the axial direction, that is, the Y direction.
  • the gate portion 12 is provided on the lens body 11 side with the step 12c as a boundary, and the second portion 31 with a large cross-sectional size is provided on the runner portion 16 side with the step 12c as a boundary. Part 32.
  • the step 12c is disposed in the XZ plane perpendicular to the axial direction of the gate portion 12, and has a lateral width parallel to the reference plane perpendicular to the optical axis OA of the optical function unit 21, that is, the XY plane, and the optical axis OA.
  • the size is adjusted by changing the vertical width parallel to the vertical axis. Specifically, the horizontal width t11 of the first portion 31 is wider than the horizontal width t12 of the second portion 32, and the vertical width t21 of the first portion 31 is wider than the vertical width t22 of the second portion 32.
  • the first portion 31 and the second portion 32 have their upper surfaces S1 and S2 made to coincide with each other.
  • the top surfaces of the first and second portions 31 and 32 are aligned with the parting line of the mold for injection molding, but at least the top surfaces of the first and second portions 31 and 32 are the same. It is also possible to shift one from the parting line.
  • the size of the gate portion 12 is appropriately set according to the molding conditions such as the size of the lens main body portion 11, the type of molding resin, and the molding temperature.
  • the length da is normally in the range of 0.06 mm to 0.35 mm.
  • the axial length db of the second portion 32 can be arbitrarily increased or decreased as a molding condition that does not affect the appearance of the lens body 11.
  • the process of the 1st part 31 becomes easy, so that the length da of the 1st part 31 becomes larger than the length db of the 2nd part 32.
  • the fluidity of the resin in the gate portion 12 can be increased as the length da of the first portion 31 becomes smaller than the length db of the second portion 32.
  • Runner portion 16 extends in a direction extending gate portion 12.
  • the runner portion 16 as a whole has a cross-sectional size much larger than the cross-sectional sizes of the portions 31 and 32 of the gate portion 12, but the second portion 32 is connected to the second portion 32 of the gate portion 12. The same cross-sectional size.
  • the lens 10 shown in FIG. 2C and the like will be described.
  • the lens 10 is obtained by subjecting the molded product 100 to gate part cutting, and includes a lens body 11 and a part of the outer periphery thereof. And a finish convex portion 14 protruding from the surface.
  • the finishing convex portion 14 is obtained by removing the second portion 32 of the gate portion 12, and has a rectangular end surface EF corresponding to the position of the finishing surface CF (see FIG. 1A) by the cutting tool. Yes.
  • the lens 10 is a coupling lens or an objective lens incorporated in an optical pickup device for BD
  • the diameter d is further miniaturized, and it is difficult to visually recognize by partially cutting the flange portion 22 as in the past. It has become.
  • the lens 10 incorporated in the optical pickup device for BD or the like when the finish convex portion 14 is considered as a mark, it is important to leave the gate portion 12, particularly the first portion 31 having a large size. .
  • the protrusion amount tp of the finish convex portion 14 is set in a range of 0.06 mm or more and 0.35 mm or less.
  • the finishing convex portion 14 is a block or a block for preventing the influence of stress, heat, etc. on the lens body portion 11 (particularly the optical function portion 21) when performing work such as excision on the gate portion 12.
  • the cross-sectional size of the first portion 31 on the lens body portion 11 side and partially remaining after resection is larger than the cross-sectional size of the second portion 32 on the runner portion 16 side.
  • the molding die gate (not shown) corresponding to the gate portion 12 has a meaning of reducing the flow rate of the resin, but it is desirable that the flow path shape of the gate can be adjusted from the viewpoint of adjusting the molding conditions. However, when the flow path shape of the gate is adjusted, it is not desirable that the adjustment result remains in the lens 10. From such a viewpoint, it is desirable that the cross-sectional size of the first portion 31 on the lens body portion 11 side and partially remaining after resection is larger than the cross-sectional size of the second portion 32 on the runner portion 16 side. That is, the lens injection molding conditions are adjusted by changing the cross-sectional size of the second portion 32.
  • a method for manufacturing the lens 10 will be described.
  • a molded product 100 as shown in FIG. 1A is produced by an injection molding apparatus (not shown).
  • the sprue part (not shown) is normally attached to the tip of the runner part 16 in the molded article 100, it is assumed that the sprue part has been removed by cutting an appropriate portion of the runner part 16 in advance.
  • the thin second portion 32 of the gate portion 12 of the molded product 100 is cut in a cross section substantially parallel to the XZ plane with a cutting tool such as a nipper.
  • cutting is performed along the finishing surface CF provided on the thick first part 31 of the gate part 12 by a cutting tool such as an end mill, and the second part 32 and a part of the first part 31 Remove.
  • the finish convex part 14 remains as a trace of the gate part 12, and a rectangular end face EF is formed at the position of the finish face CF.
  • the partial cutting of the first portion 31 may affect the lens main body 11 due to processing stress, heat, etc., but by making the finish convex portion 14 relatively large, such a Can be blocked or blocked.
  • the width of the flange portion 22 is also reduced.
  • the finish convex portion 14 so as to protrude from the flange portion 22, the space or distance from the finish surface CF to the optical function portion 21 can be reduced. Can be secured.
  • the gate portion 12 has the step 12c along the Y direction perpendicular to the optical axis OA of the lens main body 11, so that the runner portion is more than the step 12c.
  • the cross-sectional size of the gate portion 12 can be adjusted without affecting the appearance of the lens 10 on the 16 side. In this case, the influence of the cutting off of the gate portion or the like is less likely to affect the optical performance of the lens main body portion 11, and the manufacturing conditions relating to the shape and size of the gate are easily adjusted.
  • the second portion 32 of the gate portion 12 is tapered from the runner portion 16 toward the lens body portion 11.
  • the flow path in the mold for injection-molding the molded product 100 is once narrowed in the space for the gate portion 12 and communicated with the cavity corresponding to the lens body portion 11.
  • the second portion 32 of the gate portion 12 is widened from the runner portion 16 toward the lens body portion 11.
  • the flow path in the mold for injection molding the molded product 100 is narrowed forward in the space for the gate portion 12 and communicates with the cavity corresponding to the lens body portion 11.
  • the second portion 32 of the gate portion 12 is inclined with respect to the axis of the runner portion 16, that is, the Y direction (see FIG. 1A). Yes.
  • the flow path in the mold for injection-molding the molded product 100 is inclined in the space for the gate portion 12 and communicates with the cavity corresponding to the lens main body portion 11. The flow can have a tendency to swirl.
  • the lateral width t12 of the second portion 32 of the gate portion 12 is made half thinner than that shown in FIG. 1 (A).
  • the flow path in the mold for injection molding the molded product 100 is extremely narrowed in the space for the gate portion 12 and communicates with the cavity corresponding to the lens body portion 11.
  • the cross-sectional shapes of the first portion 31 and the second portion 32 of the gate portion 12 are trapezoidal.
  • the cross-sectional shape of the second portion 32 can be adjusted to an appropriate one in consideration of the fluidity of the resin, the release property of the molded product 100, and the like.
  • the lower surface S3 of the first portion 31 and the lower surface S4 of the second portion 32 are made to coincide with each other by arranging the second portion 32 of the gate portion 12 on the ⁇ Z side.
  • the cross-sectional shapes of the portion 31 and the second portion 32 are trapezoidal. In this case, parting lines are arranged at the positions of the lower surfaces S3 and S4.
  • the vertical width t ⁇ b> 21 of the first portion 31 of the gate portion 12 is smaller than the thickness of the flange portion 22.
  • the size of the first portion 31, that is, the finish convex portion 14 can also be changed as appropriate according to the application and specifications.
  • the lens manufacturing method has been described above as a specific embodiment, but the lens manufacturing method according to the present invention is not limited to the above.
  • the lens 10 is not limited to the optical pickup device for BD, but can be incorporated in an optical pickup device for DVD (Digital Versatile Disc) and CD (Compact Disc).
  • DVD Digital Versatile Disc
  • CD Compact Disc
  • the optical surface 21a and the optical surface 21b are used.
  • the shape is also changed as appropriate.
  • the lens 10 is not limited to the optical pickup device, but can be incorporated into a mobile phone or the like as a small imaging lens.
  • the gate portion 12 is not limited to two stages, but can have a shape in which the cross-sectional size is changed to three or more stages.
  • the finish convex portion 14 is not limited to a single step, and can have a shape in which the cross-sectional size is changed to two or more steps.
  • one or more flat portions substantially parallel to a plane including the optical axis OA may be provided on the outer periphery of the flange portion 22 of the lens 10.
  • one or a plurality of flat portions substantially parallel to the plane including the optical axis OA may be provided on the outer periphery of the optical surface 21a or the optical surface 21b of the lens 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The purpose of the present invention is to provide a method for manufacturing a lens in a manner that makes it possible to reduce the effect produced by the cutting of a gate portion or the like on optical performance. A gate portion (12) has a step (12c) in a Y direction perpendicular to the optical axis (OA) of the lens main body (11). The cross-sectional size of the gate portion (12) can therefore be adjusted on the runner portion (16) side of the step (12c) without affecting the appearance of the lens (10). In this case, cutting the gate portion or the like is less prone to affect the optical performance of the lens main body (11), and production conditions relating to the size and shape of the gate and other parameters can be readily adjusted.

Description

レンズの製造方法Lens manufacturing method
　本発明は、情報の記録及び／又は再生等を行うための光ピックアップ装置等に組み込まれるレンズの製造方法に関する。 The present invention relates to a method for manufacturing a lens incorporated in an optical pickup device or the like for recording and / or reproducing information.
　光ピックアップ装置等で使用されるレンズとして、光機能部の外周を構成するフランジ部の一部から突出するようにサイドゲート内形成部位（所謂ゲート部）を設けたものが存在する（特許文献１の図１等参照）。 As a lens used in an optical pickup device or the like, there is a lens provided with a side gate formation portion (so-called gate portion) so as to protrude from a part of a flange portion constituting the outer periphery of an optical function portion (Patent Document 1). FIG. 1 etc.).
　また、同様のレンズであるが、ゲート部とともに光機能部の外周を構成するフランジ部を部分的に切除するものが存在する（例えば、特許文献２の図７、特許文献３の図５等参照）。 Further, there is a similar lens, but there is a lens that partially cuts out the flange portion that forms the outer periphery of the optical function portion together with the gate portion (for example, see FIG. 7 of Patent Document 2 and FIG. 5 of Patent Document 3). ).
　しかしながら、従来のレンズでは、フランジ部から横方向に柱状に延びるゲート部を形成しており、ゲート部を部分的に残すように切除しても、フランジ部まで切除しても、ゲート部の切除や離型時に光機能部の性能に影響が発生する可能性があり、ゲート部の寸法を変更するごとに光機能部への影響も変化する可能性があった。特に、光ピックアップ装置等の分野では、レンズの小型化が進んでおり、ゲート部の切除等による光学性能への深刻な影響が懸念されている。 However, in the conventional lens, a gate portion extending in a column shape in the lateral direction from the flange portion is formed, and even if the gate portion is excised so as to leave a part, or even the flange portion is excised, the gate portion is excised. In addition, there is a possibility that the performance of the optical function part is affected at the time of mold release, and the influence on the optical function part may be changed whenever the dimensions of the gate part are changed. In particular, in the field of optical pickup devices and the like, the size of lenses has been reduced, and there is a concern that the optical performance due to the cutting of the gate portion may be seriously affected.
特開２００７－２９２８４２号公報JP 2007-292842 A 特開２００２－２００６５３号公報JP 2002-200653 A 特開２００８－１２６６１１号公報JP 2008-126611 A
　本発明は、ゲート部の切除等による光学性能への影響を低減できるレンズの製造方法を提供することを目的とする。 An object of the present invention is to provide a method of manufacturing a lens that can reduce the influence on the optical performance due to the cutting of the gate portion.
　上記課題を解決するため、本発明に係るレンズの製造方法は、一対の光学面を有するレンズ本体部と、レンズ本体部の外周の一部から延びるゲート部とを備える成形品を射出成形によって形成する工程と、ゲート部を部分的に切除することによって仕上凸部を形成する工程とを有し、ゲート部は、レンズ本体部の光軸に垂直な方向に沿って段差を有することを特徴とする。 In order to solve the above-described problems, a method for manufacturing a lens according to the present invention includes forming a molded product including a lens body having a pair of optical surfaces and a gate extending from a part of the outer periphery of the lens body by injection molding. And a step of forming a finish convex portion by partially cutting the gate portion, wherein the gate portion has a step along a direction perpendicular to the optical axis of the lens body portion. To do.
　上記レンズの製造方法によれば、ゲート部がレンズ本体部の光軸に垂直な方向に沿って段差を有するので、段差よりもランナー部側でゲート部の断面サイズを調整することができる。この場合、ゲート部の切除等の影響がレンズ本体部の光学性能に及びにくくなり、ゲート等に関する製造条件の調整が容易である。 According to the above-described lens manufacturing method, since the gate portion has a step along the direction perpendicular to the optical axis of the lens body, the cross-sectional size of the gate portion can be adjusted closer to the runner portion than the step. In this case, the influence of the cutting of the gate portion or the like hardly affects the optical performance of the lens main body portion, and the manufacturing conditions relating to the gate and the like can be easily adjusted.
　本発明の具体的な態様又は側面では、上記レンズの製造方法において、段差が、光軸に垂直な基準面に平行な横幅と、光軸に平行な縦幅との少なくとも一方を変化させることによって形成されている。この場合、段差の形成が容易である。 In a specific aspect or aspect of the present invention, in the method for manufacturing a lens, the step is changed by changing at least one of a horizontal width parallel to a reference plane perpendicular to the optical axis and a vertical width parallel to the optical axis. Is formed. In this case, it is easy to form a step.
　本発明の別の側面では、ゲート部が、段差を境としてレンズ本体部側に設けられ断面サイズの大きな第１部分と、段差を境としてランナー部側に設けられ断面サイズの小さな第２部分とを有する。この場合、レンズ本体部側でゲート部の断面サイズが大きくなり、ゲート部の形状が安定化する。 In another aspect of the present invention, the gate part is provided on the lens body part side with the step as a boundary, and the first part having a large cross-sectional size, and the second part provided on the runner part side with the step as a boundary, Have In this case, the cross-sectional size of the gate portion is increased on the lens body side, and the shape of the gate portion is stabilized.
　本発明のさらに別の側面では、第２部分の断面サイズを変化させることによって、レンズの射出成形の条件を調節する。この場合、レンズ本体部から離れた部分で射出成形時の樹脂流量等の諸条件を簡易に調整できる。 In yet another aspect of the present invention, the injection molding conditions of the lens are adjusted by changing the cross-sectional size of the second portion. In this case, various conditions such as a resin flow rate at the time of injection molding can be easily adjusted at a portion away from the lens body.
　本発明のさらに別の側面では、仕上凸部が、段差よりもレンズ本体部側に形成される。この場合、最終製品のレンズに方向性を示すマークとしてのゲート部すなわち仕上凸部を所望のサイズで残すことができる。この際、残ったマークは、ゲートに関する製造条件の調整に関わらず一定のものになる。 In yet another aspect of the present invention, the finish convex portion is formed on the lens main body side of the step. In this case, it is possible to leave a gate portion, ie, a finish convex portion, as a mark indicating directionality in the lens of the final product with a desired size. At this time, the remaining marks are constant regardless of the adjustment of the manufacturing conditions regarding the gate.
　本発明のさらに別の側面では、レンズが、光ディスクに情報の記録及び／又は再生を行うための光ピックアップ装置に組み込まれる。この場合、レンズが小型となるので、ゲート部切除等の影響がレンズ本体部の光学性能に及びにくい点や、ゲート等に関する製造条件の調整が容易である点が、特に重要な意味を持つようになる。 In still another aspect of the present invention, the lens is incorporated into an optical pickup device for recording and / or reproducing information on an optical disc. In this case, since the lens is small, it is particularly important that the influence of the cutting off of the gate portion does not easily affect the optical performance of the lens body and that the manufacturing conditions relating to the gate and the like can be easily adjusted. become.
　本発明のさらに別の側面では、レンズが、ＢＤ（Blu-ray Disc）用の光ピックアップ装置に組み込まれる。ＢＤ用のカップリングレンズ、対物レンズ等は、小型で光学特性の仕様も厳しいが、上記のようにゲート部切除の影響がレンズ本体部の光学性能に及びにくく、ゲートに関する製造条件の調整が容易であるので、高性能のレンズを安定して提供することができる。 In yet another aspect of the present invention, the lens is incorporated in an optical pickup device for BD (Blu-ray Disc). BD coupling lenses, objective lenses, etc. are compact and have strict specifications on optical characteristics. However, as described above, the effect of cutting off the gate is difficult to affect the optical performance of the lens body, making it easy to adjust the manufacturing conditions related to the gate. Therefore, a high-performance lens can be provided stably.
　本発明のさらに別の側面では、レンズ本体部の直径が、１．６ｍｍ以上３．５ｍｍ以下である。一般的な用途では、レンズ本体部の直径が１．６ｍｍ以上であり、ゲート部切除の影響が現れやすくなるのは、直径が３．５ｍｍ以下の場合である。 In still another aspect of the present invention, the diameter of the lens body is 1.6 mm or more and 3.5 mm or less. In a general application, the lens body has a diameter of 1.6 mm or more, and the influence of the gate part cutting is likely to appear when the diameter is 3.5 mm or less.
　本発明のさらに別の側面では、仕上凸部のレンズ本体部の外周からの突出長は、０．０６ｍｍ以上０．３５ｍｍ以下である。０．０６ｍｍ以上とすることで、ゲート部切除によって残ったマークの視認が比較的容易になり、０．３５ｍｍ以下とすることで、製品レンズの外観に与える影響を低減できる。 In yet another aspect of the present invention, the projection length of the finish convex portion from the outer periphery of the lens body is 0.06 mm or more and 0.35 mm or less. By setting the distance to 0.06 mm or more, it becomes relatively easy to visually recognize the mark remaining after cutting the gate portion. By setting the distance to 0.35 mm or less, the influence on the appearance of the product lens can be reduced.
（Ａ）及び（Ｂ）は、第１実施形態に係るレンズの製造方法における加工対象である成形品の外観を説明する平面図及び側面図である。(A) And (B) is the top view and side view explaining the external appearance of the molded article which is a process target in the manufacturing method of the lens which concerns on 1st Embodiment. （Ａ）及び（Ｂ）は、切断工程後の中間段階を説明する側面図であり、（Ｃ）及び（Ｄ）は、仕上工程後のレンズの外観を説明する側面図であり、（Ｅ）は、仕上工程後のレンズを説明する平面図である。(A) And (B) is a side view explaining the intermediate | middle stage after a cutting process, (C) And (D) is a side view explaining the external appearance of the lens after a finishing process, (E) These are top views explaining the lens after a finishing process. （Ａ）～（Ｅ）は、第２実施形態の製造方法における加工対象である成形品を説明する平面図である。(A) to (E) are plan views for explaining a molded product to be processed in the manufacturing method of the second embodiment. （Ａ）及び（Ｂ）は、第３実施形態の製造方法における加工対象である成形品を説明する側面図である。(A) And (B) is a side view explaining the molded article which is a process target in the manufacturing method of 3rd Embodiment. 第４実施形態の製造方法における加工対象である成形品を説明する側面図である。It is a side view explaining the molded article which is a process target in the manufacturing method of 4th Embodiment.
　〔第１実施形態〕
　図１（Ａ）及び１（Ｂ）に示すように、射出成形用の金型から取り出された成形品１００は、レンズ本体部１１と、その外周の一部から延びる２段のゲート部１２と、ゲート部１２の先端に接続されたランナー部１６とを備える。なお、図２（Ｃ）～２（Ｅ）に示すように、ゲート部切除加工を行った後の製品としてのレンズ１０には、ゲート部１２の部分的切除によって、ゲート部１２の根元側が仕上凸部１４となって残っている。 [First Embodiment]
As shown in FIGS. 1 (A) and 1 (B), a molded product 100 taken out from an injection mold includes a lens body 11 and a two-stage gate 12 extending from a part of the outer periphery thereof. , And a runner portion 16 connected to the tip of the gate portion 12. As shown in FIGS. 2 (C) to 2 (E), the base 10 of the gate portion 12 is finished by partially cutting the gate portion 12 in the lens 10 as a product after cutting the gate portion. It remains as a convex portion 14.
　まず、図１（Ａ）等に示す成形品１００について説明すると、成形品１００のうちレンズ本体部１１は、平面視円形の光機能部２１と、光機能部２１から外径方向に延在する環状のフランジ部２２とを有する。 First, the molded product 100 shown in FIG. 1A and the like will be described. The lens body 11 of the molded product 100 has a circular optical function unit 21 in plan view and extends from the optical function unit 21 in the outer diameter direction. And an annular flange portion 22.
　光機能部２１は、光ピックアップ装置内の光路上に配置されるカップリングレンズ、対物レンズ等であり、レーザ光の平行化、収束等を行う。光機能部２１は、図示の例では、凸の第１光学面２１ａと、凸の第２光学面２１ｂとを有する。すなわち、図示の光機能部２１は、光軸ＯＡが通る中心側で肉厚となっている。 The optical function unit 21 is a coupling lens, an objective lens, or the like disposed on the optical path in the optical pickup device, and performs parallelization, convergence, and the like of the laser light. In the illustrated example, the optical function unit 21 includes a convex first optical surface 21a and a convex second optical surface 21b. That is, the illustrated optical function unit 21 is thick on the center side through which the optical axis OA passes.
　フランジ部２２は、レンズ１０を周囲から支持するための鍔状の部分であり、光機能部２１の外周に接続されている。フランジ部２２は、平坦な第１フランジ面２２ａと、平坦な第２フランジ面２２ｂと、円筒状の側面２２ｃとを有する。ここで、第１フランジ面２２ａは、第１光学面２１ａの外側に隣接して延在し、第２フランジ面２２ｂは、第２光学面２１ｂの外側に隣接して延在し、両フランジ面２２ａ，２２ｂは、互いに略平行に配置されている。 The flange portion 22 is a bowl-shaped portion for supporting the lens 10 from the periphery, and is connected to the outer periphery of the optical function portion 21. The flange portion 22 has a flat first flange surface 22a, a flat second flange surface 22b, and a cylindrical side surface 22c. Here, the first flange surface 22a extends adjacent to the outside of the first optical surface 21a, the second flange surface 22b extends adjacent to the outside of the second optical surface 21b, and both flange surfaces 22a and 22b are arranged substantially parallel to each other.
　以上のレンズ本体部１１のサイズは、用途によって適宜設定されるが、光ピックアップ装置用の光学素子の場合、直径ｄが通常１．６ｍｍ以上３．５ｍｍ以下の範囲となる。 The size of the lens body 11 described above is appropriately set depending on the application, but in the case of an optical element for an optical pickup device, the diameter d is usually in the range of 1.6 mm to 3.5 mm.
　ゲート部１２は、レンズ本体部１１とランナー部１６とに挟まれてくびれた部分であり、レンズ本体部１１の外周に設けた側面２２ｃの一部から半径方向に延びている。ゲート部１２は、単純な柱状又はロッド状でなく、軸方向すなわちＹ方向に沿った一箇所に段差１２ｃを有する。結果的に、ゲート部１２は、段差１２ｃを境としてレンズ本体部１１側に設けられ断面サイズの大きな第１部分３１と、段差１２ｃを境としてランナー部１６側に設けられ断面サイズの小さな第２部分３２とを有する。 The gate portion 12 is a constricted portion sandwiched between the lens main body portion 11 and the runner portion 16, and extends in a radial direction from a part of the side surface 22 c provided on the outer periphery of the lens main body portion 11. The gate portion 12 is not a simple column or rod, but has a step 12c at one location along the axial direction, that is, the Y direction. As a result, the gate portion 12 is provided on the lens body 11 side with the step 12c as a boundary, and the second portion 31 with a large cross-sectional size is provided on the runner portion 16 side with the step 12c as a boundary. Part 32.
　ここで、段差１２ｃは、ゲート部１２の軸方向に垂直なＸＺ面内に配置されており、光機能部２１の光軸ＯＡに垂直な基準面すなわちＸＹ面に平行な横幅と、光軸ＯＡに平行な縦幅とを変化させることによってサイズが調整されている。具体的には、第１部分３１の横幅ｔ１１は第２部分３２の横幅ｔ１２よりも広くなっており、第１部分３１の縦幅ｔ２１は第２部分３２の縦幅ｔ２２よりも広くなっている。なお、ゲート部１２において、第１部分３１と第２部分３２とは、それぞれの上面Ｓ１，Ｓ２を一致させたものとなっている。これは、成形の便宜上、第１及び第２部分３１，３２の上面を射出成形用の金型のパーティングラインに合わせたものであるが、第１及び第２部分３１，３２の上面の少なくとも一方をパーティングラインからずらすことも可能である。 Here, the step 12c is disposed in the XZ plane perpendicular to the axial direction of the gate portion 12, and has a lateral width parallel to the reference plane perpendicular to the optical axis OA of the optical function unit 21, that is, the XY plane, and the optical axis OA. The size is adjusted by changing the vertical width parallel to the vertical axis. Specifically, the horizontal width t11 of the first portion 31 is wider than the horizontal width t12 of the second portion 32, and the vertical width t21 of the first portion 31 is wider than the vertical width t22 of the second portion 32. . In the gate portion 12, the first portion 31 and the second portion 32 have their upper surfaces S1 and S2 made to coincide with each other. For convenience of molding, the top surfaces of the first and second portions 31 and 32 are aligned with the parting line of the mold for injection molding, but at least the top surfaces of the first and second portions 31 and 32 are the same. It is also possible to shift one from the parting line.
　以上のゲート部１２のサイズは、レンズ本体部１１のサイズ、成形用樹脂の種類、成形温度等の成形条件に応じて適宜設定されるが、特にゲート部１２のうち第１部分３１の軸方向の長さｄａは、第１部分３１の殆どが仕上凸部１４として残ることを考慮して、通常０．０６ｍｍ以上０．３５ｍｍ以下の範囲とされる。一方、第２部分３２の軸方向の長さｄｂは、レンズ本体部１１の外観に影響を与えない成形条件として任意に増減調整できる。なお、第２部分３２の形状を固定した場合、第１部分３１の長さｄａが第２部分３２の長さｄｂよりも大きくなるほど、第１部分３１の加工が容易になるといえる。逆に、第１部分３１の長さｄａが第２部分３２の長さｄｂよりも小さくなるほど、ゲート部１２における樹脂の流動性を高めることができるといえる。 The size of the gate portion 12 is appropriately set according to the molding conditions such as the size of the lens main body portion 11, the type of molding resin, and the molding temperature. In particular, the axial direction of the first portion 31 of the gate portion 12. In consideration of the fact that most of the first portion 31 remains as the finish convex portion 14, the length da is normally in the range of 0.06 mm to 0.35 mm. On the other hand, the axial length db of the second portion 32 can be arbitrarily increased or decreased as a molding condition that does not affect the appearance of the lens body 11. In addition, when the shape of the 2nd part 32 is fixed, it can be said that the process of the 1st part 31 becomes easy, so that the length da of the 1st part 31 becomes larger than the length db of the 2nd part 32. On the contrary, it can be said that the fluidity of the resin in the gate portion 12 can be increased as the length da of the first portion 31 becomes smaller than the length db of the second portion 32.
　ランナー部１６は、ゲート部１２を延長した方向に延びている。ランナー部１６は、全体としてゲート部１２の各部分３１，３２の断面サイズよりも遙かに大きな断面サイズを有するが、ゲート部１２の第２部分３２に連結される部分では、第２部分３２と同じ断面サイズに絞られている。 Runner portion 16 extends in a direction extending gate portion 12. The runner portion 16 as a whole has a cross-sectional size much larger than the cross-sectional sizes of the portions 31 and 32 of the gate portion 12, but the second portion 32 is connected to the second portion 32 of the gate portion 12. The same cross-sectional size.
　図２（Ｃ）等に示すレンズ１０について説明すると、レンズ１０は、成形品１００に対してゲート部切除加工を施すことによって得られたものであり、レンズ本体部１１と、その外周の一部から突起する仕上凸部１４とを有する。仕上凸部１４は、ゲート部１２の第２部分３２を除去することによって得られ、切削工具による仕上面ＣＦ（図１（Ａ）参照）の位置に対応して矩形の端面ＥＦを有している。このような仕上凸部１４を製品としてレンズ１０に残すことにより、レンズ１０の光学特性等に関する方向性を示すマークとしての機能を持たせることができる。レンズ１０がＢＤ用の光ピックアップ装置に組み込まれるカップリングレンズや対物レンズである場合、その直径ｄがますます小型化しており、従来のようなフランジ部２２の部分的な切除では視認が困難になっている。つまり、ＢＤ用の光ピックアップ装置等に組み込まれるレンズ１０については、仕上凸部１４をマークとして考えた場合、ゲート部１２を残すこと、特にサイズの大きな第１部分３１を残すことが重要である。一方、仕上凸部１４をマークとして目立たせるためには、仕上凸部１４の突出量ｔｐ（仕上凸部１４のレンズ本体部１１の外周からの突出長）を大きくすることが望ましいが、突出量ｔｐを大きくし過ぎるとレンズ１０の取り付けや取り扱い上の支障が生じやすい。このような観点から、仕上凸部１４の突出量ｔｐは、０．０６ｍｍ以上０．３５ｍｍ以下の範囲としている。なお、この仕上凸部１４は、ゲート部１２に対して切除等の作業を行う際に、応力、熱等の影響がレンズ本体部１１（特に光機能部２１）に及ぶことを防止するブロック又は緩衝材としての役割を有する。また、仕上凸部１４は、成形品１００を金型外に取り出す際に、ランナー部１６等からの力によってゲート部１２を折り曲げるような応力が生じても、段差１２ｃに応力を集中させてレンズ本体部１１に影響が生じないようにする役割も有している。このような観点から、レンズ本体部１１側にあって切除後も部分的に残る第１部分３１の断面サイズは、ランナー部１６側の第２部分３２の断面サイズよりも大きくすることが望ましい。 The lens 10 shown in FIG. 2C and the like will be described. The lens 10 is obtained by subjecting the molded product 100 to gate part cutting, and includes a lens body 11 and a part of the outer periphery thereof. And a finish convex portion 14 protruding from the surface. The finishing convex portion 14 is obtained by removing the second portion 32 of the gate portion 12, and has a rectangular end surface EF corresponding to the position of the finishing surface CF (see FIG. 1A) by the cutting tool. Yes. By leaving such a finish convex portion 14 as a product in the lens 10, it is possible to provide a function as a mark indicating the directionality of the optical characteristics and the like of the lens 10. When the lens 10 is a coupling lens or an objective lens incorporated in an optical pickup device for BD, the diameter d is further miniaturized, and it is difficult to visually recognize by partially cutting the flange portion 22 as in the past. It has become. In other words, regarding the lens 10 incorporated in the optical pickup device for BD or the like, when the finish convex portion 14 is considered as a mark, it is important to leave the gate portion 12, particularly the first portion 31 having a large size. . On the other hand, in order to make the finish convex portion 14 stand out as a mark, it is desirable to increase the protrusion amount tp of the finish convex portion 14 (the protrusion length of the finish convex portion 14 from the outer periphery of the lens body 11). If tp is too large, the lens 10 may be easily attached or handled. From such a viewpoint, the protrusion amount tp of the finish convex portion 14 is set in a range of 0.06 mm or more and 0.35 mm or less. The finishing convex portion 14 is a block or a block for preventing the influence of stress, heat, etc. on the lens body portion 11 (particularly the optical function portion 21) when performing work such as excision on the gate portion 12. Has a role as a cushioning material. Further, when the finished convex portion 14 takes out the molded product 100 out of the mold, even if a stress that bends the gate portion 12 due to a force from the runner portion 16 or the like is generated, the stress is concentrated on the step 12c and the lens is formed. It also has a role to prevent the main body 11 from being affected. From such a viewpoint, it is desirable that the cross-sectional size of the first portion 31 on the lens body portion 11 side and partially remaining after resection is larger than the cross-sectional size of the second portion 32 on the runner portion 16 side.
　なお、ゲート部１２に対応する成形金型のゲート（不図示）は、樹脂の流量を絞る意味があるが、成形条件の調整の観点からは、ゲートの流路形状を調整できることが望ましい。しかしながら、ゲートの流路形状を調整した場合に、その調整結果がレンズ１０に残ることは望ましくない。このような観点から、レンズ本体部１１側にあって切除後も部分的に残る第１部分３１の断面サイズは、ランナー部１６側の第２部分３２の断面サイズよりも大きくすることが望ましい。つまり、第２部分３２の断面サイズを変化させることによって、レンズの射出成形の条件を調節する。 It should be noted that the molding die gate (not shown) corresponding to the gate portion 12 has a meaning of reducing the flow rate of the resin, but it is desirable that the flow path shape of the gate can be adjusted from the viewpoint of adjusting the molding conditions. However, when the flow path shape of the gate is adjusted, it is not desirable that the adjustment result remains in the lens 10. From such a viewpoint, it is desirable that the cross-sectional size of the first portion 31 on the lens body portion 11 side and partially remaining after resection is larger than the cross-sectional size of the second portion 32 on the runner portion 16 side. That is, the lens injection molding conditions are adjusted by changing the cross-sectional size of the second portion 32.
　以下、レンズ１０の製造方法について説明する。まず、不図示の射出成形装置により、図１（Ａ）に示すような成形品１００を作製する。なお、成形品１００には、通常ランナー部１６の先にスプル部（不図示）が付随するが、予めランナー部１６の適所を切断することで、スプル部を除去してあるものとする。次に、成形品１００のゲート部１２のうち細い第２部分３２を、ニッパー等の切断工具によりＸＺ面に略平行な断面で切断する。その後、エンドミル等の切削工具によりゲート部１２のうち太い第１部分３１に設けた仕上面ＣＦに沿って切削（ゲート部切除加工）を行い、第２部分３２と第１部分３１の一部とを除去する。これにより、ゲート部１２の跡として仕上凸部１４が残り、仕上面ＣＦの位置には、矩形の端面ＥＦが形成される。この際、第１部分３１の部分的な切除によって、加工時の応力、熱等の影響がレンズ本体部１１に及ぶ可能性があるが、仕上凸部１４を比較的大きくすることによって、そのような影響をブロック又は遮断することができる。特に、レンズ本体部１１が小さくなるとフランジ部２２の幅も狭くなるが、フランジ部２２から突起するように仕上凸部１４を残すことで、仕上面ＣＦから光機能部２１までのスペース又は距離を確保することができる。 Hereinafter, a method for manufacturing the lens 10 will be described. First, a molded product 100 as shown in FIG. 1A is produced by an injection molding apparatus (not shown). In addition, although the sprue part (not shown) is normally attached to the tip of the runner part 16 in the molded article 100, it is assumed that the sprue part has been removed by cutting an appropriate portion of the runner part 16 in advance. Next, the thin second portion 32 of the gate portion 12 of the molded product 100 is cut in a cross section substantially parallel to the XZ plane with a cutting tool such as a nipper. Then, cutting (gate part cutting) is performed along the finishing surface CF provided on the thick first part 31 of the gate part 12 by a cutting tool such as an end mill, and the second part 32 and a part of the first part 31 Remove. Thereby, the finish convex part 14 remains as a trace of the gate part 12, and a rectangular end face EF is formed at the position of the finish face CF. At this time, the partial cutting of the first portion 31 may affect the lens main body 11 due to processing stress, heat, etc., but by making the finish convex portion 14 relatively large, such a Can be blocked or blocked. In particular, when the lens body 11 is reduced, the width of the flange portion 22 is also reduced. However, by leaving the finish convex portion 14 so as to protrude from the flange portion 22, the space or distance from the finish surface CF to the optical function portion 21 can be reduced. Can be secured.
　以上のように、本実施形態に係るレンズの製造方法によれば、ゲート部１２がレンズ本体部１１の光軸ＯＡに垂直なＹ方向に沿って段差１２ｃを有するので、段差１２ｃよりもランナー部１６側でレンズ１０の外観に影響を与えることなくゲート部１２の断面サイズを調整することができる。この場合、ゲート部切除等の影響がレンズ本体部１１の光学性能に及びにくくなり、ゲートの形状やサイズ等に関する製造条件の調整が容易である。 As described above, according to the method for manufacturing a lens according to the present embodiment, the gate portion 12 has the step 12c along the Y direction perpendicular to the optical axis OA of the lens main body 11, so that the runner portion is more than the step 12c. The cross-sectional size of the gate portion 12 can be adjusted without affecting the appearance of the lens 10 on the 16 side. In this case, the influence of the cutting off of the gate portion or the like is less likely to affect the optical performance of the lens main body portion 11, and the manufacturing conditions relating to the shape and size of the gate are easily adjusted.
　〔第２実施形態〕
　以下、第２実施形態に係るレンズの製造方法について説明する。なお、第２実施形態の製造方法は、第１実施形態の製造方法を変形したものであり、特に説明しない部分については、第１実施形態と同様であるものとする。 [Second Embodiment]
Hereinafter, a method for manufacturing a lens according to the second embodiment will be described. Note that the manufacturing method of the second embodiment is a modification of the manufacturing method of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment.
　図３（Ａ）に示す例では、ゲート部１２のうち第２部分３２をランナー部１６からレンズ本体部１１に向けて先細りにしたものとなっている。この場合、成形品１００を射出成形するための金型内の流路がゲート部１２用の空間で一旦先細りに絞られ、レンズ本体部１１に対応するキャビティ内に連通するものとなる。 In the example shown in FIG. 3A, the second portion 32 of the gate portion 12 is tapered from the runner portion 16 toward the lens body portion 11. In this case, the flow path in the mold for injection-molding the molded product 100 is once narrowed in the space for the gate portion 12 and communicated with the cavity corresponding to the lens body portion 11.
　図３（Ｂ）に示す例では、ゲート部１２のうち第２部分３２をランナー部１６からレンズ本体部１１に向けて先広がりにしたものとなっている。この場合、成形品１００を射出成形するための金型内の流路がゲート部１２用の空間で先広がりに絞られ、レンズ本体部１１に対応するキャビティ内に連通するものとなる。 In the example shown in FIG. 3 (B), the second portion 32 of the gate portion 12 is widened from the runner portion 16 toward the lens body portion 11. In this case, the flow path in the mold for injection molding the molded product 100 is narrowed forward in the space for the gate portion 12 and communicates with the cavity corresponding to the lens body portion 11.
　図３（Ｃ）及び３（Ｄ）に示す例では、ゲート部１２のうち第２部分３２をランナー部１６の軸つまりＹ方向（図１（Ａ）参照）に対して傾けたものとなっている。この場合、成形品１００を射出成形するための金型内の流路がゲート部１２用の空間で傾けられレンズ本体部１１に対応するキャビティ内に連通するものとなるので、キャビティ内の樹脂の流れに旋回する傾向を持たせることができる。 3C and 3D, the second portion 32 of the gate portion 12 is inclined with respect to the axis of the runner portion 16, that is, the Y direction (see FIG. 1A). Yes. In this case, the flow path in the mold for injection-molding the molded product 100 is inclined in the space for the gate portion 12 and communicates with the cavity corresponding to the lens main body portion 11. The flow can have a tendency to swirl.
　図３（Ｅ）に示す例では、ゲート部１２のうち第２部分３２の横幅ｔ１２を図１（Ａ）に示すものに比較して半分程度に細くしたものとなっている。この場合、成形品１００を射出成形するための金型内の流路がゲート部１２用の空間で極端に絞られ、レンズ本体部１１に対応するキャビティ内に連通するものとなる。 In the example shown in FIG. 3 (E), the lateral width t12 of the second portion 32 of the gate portion 12 is made half thinner than that shown in FIG. 1 (A). In this case, the flow path in the mold for injection molding the molded product 100 is extremely narrowed in the space for the gate portion 12 and communicates with the cavity corresponding to the lens body portion 11.
　〔第３実施形態〕
　以下、第３実施形態に係るレンズの製造方法について説明する。なお、第３実施形態の製造方法は、第１実施形態の製造方法を変形したものであり、特に説明しない部分については、第１実施形態と同様であるものとする。 [Third Embodiment]
Hereinafter, a method for manufacturing a lens according to the third embodiment will be described. Note that the manufacturing method of the third embodiment is a modification of the manufacturing method of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment.
　図４（Ａ）に示す例では、ゲート部１２の第１部分３１及び第２部分３２の断面形状を台形にしている。第２部分３２の断面形状は、樹脂の流動性、成形品１００の離型性等を考慮して適切なものに調整することができる。 In the example shown in FIG. 4A, the cross-sectional shapes of the first portion 31 and the second portion 32 of the gate portion 12 are trapezoidal. The cross-sectional shape of the second portion 32 can be adjusted to an appropriate one in consideration of the fluidity of the resin, the release property of the molded product 100, and the like.
　図４（Ｂ）に示す例では、ゲート部１２のうち第２部分３２を－Ｚ側に配置することで第１部分３１の下面Ｓ３と第２部分３２の下面Ｓ４とを一致させ、第１部分３１及び第２部分３２の断面形状を台形にしている。なお、この場合、下面Ｓ３，Ｓ４の位置にパーティングラインが配置される。 In the example shown in FIG. 4B, the lower surface S3 of the first portion 31 and the lower surface S4 of the second portion 32 are made to coincide with each other by arranging the second portion 32 of the gate portion 12 on the −Z side. The cross-sectional shapes of the portion 31 and the second portion 32 are trapezoidal. In this case, parting lines are arranged at the positions of the lower surfaces S3 and S4.
　〔第４実施形態〕
　以下、第４実施形態に係るレンズの製造方法について説明する。なお、第４実施形態の製造方法は、第１実施形態の製造方法を変形したものであり、特に説明しない部分については、第１実施形態と同様であるものとする。 [Fourth Embodiment]
Hereinafter, a method for manufacturing a lens according to the fourth embodiment will be described. Note that the manufacturing method of the fourth embodiment is a modification of the manufacturing method of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment.
　図５に示すように、ゲート部１２のうち第１部分３１の縦幅ｔ２１は、フランジ部２２の厚みよりも小さくなっている。このように、第１部分３１すなわち仕上凸部１４のサイズも用途や仕様に応じて適宜変更することができる。 As shown in FIG. 5, the vertical width t <b> 21 of the first portion 31 of the gate portion 12 is smaller than the thickness of the flange portion 22. Thus, the size of the first portion 31, that is, the finish convex portion 14 can also be changed as appropriate according to the application and specifications.
　以上、具体的な実施形態としてレンズの製造方法を説明したが、本発明に係るレンズの製造方法は上記のものには限られない。例えば、レンズ１０は、ＢＤ用の光ピックアップ装置に限らず、ＤＶＤ（Digital Versatile Disc）用、ＣＤ（Compact Disc）用の光ピックアップ装置に組み込むことができ、その際、光学面２１ａ，光学面２１ｂの形状も適宜変更される。 The lens manufacturing method has been described above as a specific embodiment, but the lens manufacturing method according to the present invention is not limited to the above. For example, the lens 10 is not limited to the optical pickup device for BD, but can be incorporated in an optical pickup device for DVD (Digital Versatile Disc) and CD (Compact Disc). In this case, the optical surface 21a and the optical surface 21b are used. The shape is also changed as appropriate.
　また、レンズ１０は、光ピックアップ装置に限らず、小型の撮像レンズとして携帯電話機等に組み込むこともできる。 Further, the lens 10 is not limited to the optical pickup device, but can be incorporated into a mobile phone or the like as a small imaging lens.
　また、ゲート部１２は、２段に限らず３段以上に断面サイズを変更した形状とすることができる。この際、仕上凸部１４も、１段に限らず２段以上に断面サイズを変更した形状とすることができる。 Further, the gate portion 12 is not limited to two stages, but can have a shape in which the cross-sectional size is changed to three or more stages. At this time, the finish convex portion 14 is not limited to a single step, and can have a shape in which the cross-sectional size is changed to two or more steps.
　また、レンズ１０のフランジ部２２の外周に光軸ＯＡを含む平面と略平行な１つあるいは複数の平坦部を設けても良い。同様にレンズ１０の光学面２１ａや光学面２１ｂの外周に光軸ＯＡを含む平面と略平行な１つあるいは複数の平坦部を設けても良い。これにより、光軸ＯＡと直交する方向にレンズ１０を小型化することが可能となるので、かかるレンズ１０を組み込んだ光ピックアップ装置や携帯電話機を小型化することが可能となる。 Further, one or more flat portions substantially parallel to a plane including the optical axis OA may be provided on the outer periphery of the flange portion 22 of the lens 10. Similarly, one or a plurality of flat portions substantially parallel to the plane including the optical axis OA may be provided on the outer periphery of the optical surface 21a or the optical surface 21b of the lens 10. As a result, the lens 10 can be reduced in size in a direction orthogonal to the optical axis OA, so that an optical pickup device or a mobile phone incorporating the lens 10 can be reduced in size.

Claims (9)

  1. 　一対の光学面を有するレンズ本体部と、前記レンズ本体部の外周の一部から延びるゲート部とを備える成形品を射出成形によって形成する工程と、
    　前記ゲート部を部分的に切除することによって仕上凸部を形成する工程とを有し、
    　前記ゲート部は、前記レンズ本体部の光軸に垂直な方向に沿って段差を有する、レンズの製造方法。     Forming a molded product comprising a lens body having a pair of optical surfaces and a gate extending from a part of the outer periphery of the lens body by injection molding;
    Forming a finish convex portion by partially excising the gate portion,
    The method for manufacturing a lens, wherein the gate portion has a step along a direction perpendicular to an optical axis of the lens body portion.
  2. 　前記段差は、前記光軸に垂直な基準面に平行な横幅と、前記光軸に平行な縦幅との少なくとも一方を変化させることによって形成されている、請求項１に記載のレンズの製造方法。 The lens manufacturing method according to claim 1, wherein the step is formed by changing at least one of a lateral width parallel to a reference plane perpendicular to the optical axis and a vertical width parallel to the optical axis. .
  3. 　前記ゲート部は、前記段差を境として前記レンズ本体部側に設けられ断面サイズの大きな第１部分と、前記段差を境としてランナー部側に設けられ断面サイズの小さな第２部分とを有する、請求項１に記載のレンズの製造方法。 The gate portion includes a first portion having a large cross-sectional size provided on the lens body portion side with the step as a boundary, and a second portion having a small cross-sectional size provided on the runner portion side with the step as a boundary. Item 2. A method for producing a lens according to Item 1.
  4. 　前記第２部分の断面サイズを変化させることによって、前記レンズの射出成形の条件を調節する、請求項３に記載のレンズの製造方法。 The method for manufacturing a lens according to claim 3, wherein conditions for injection molding of the lens are adjusted by changing a cross-sectional size of the second portion.
  5. 　前記仕上凸部は、前記段差よりも前記レンズ本体部側に形成される、請求項１に記載のレンズの製造方法。 2. The lens manufacturing method according to claim 1, wherein the finish convex portion is formed closer to the lens body than the step.
  6. 　前記レンズは、光ディスクに情報の記録及び／又は再生を行うための光ピックアップ装置に組み込まれる、請求項１に記載のレンズの製造方法。 The lens manufacturing method according to claim 1, wherein the lens is incorporated in an optical pickup device for recording and / or reproducing information on an optical disc.
  7. 　前記レンズは、ＢＤ用の光ピックアップ装置に組み込まれる、請求項６に記載のレンズの製造方法。 The lens manufacturing method according to claim 6, wherein the lens is incorporated in an optical pickup device for BD.
  8. 　前記レンズ本体部の直径は、１．６ｍｍ以上３．５ｍｍ以下である、請求項１から請求項７までのいずれか一項に記載のレンズの製造方法。 The lens manufacturing method according to any one of claims 1 to 7, wherein a diameter of the lens body is 1.6 mm or more and 3.5 mm or less.
  9. 　前記仕上凸部の前記レンズ本体部の外周からの突出長は、０．０６ｍｍ以上０．３５ｍｍ以下である、請求項１から請求項７までのいずれか一項に記載のレンズの製造方法。 The method for producing a lens according to any one of claims 1 to 7, wherein a projection length of the finish convex portion from the outer periphery of the lens main body portion is 0.06 mm or more and 0.35 mm or less.
PCT/JP2011/070527 2010-09-30 2011-09-08 Method for manufacturing lens WO2012043190A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2012536314A JPWO2012043190A1 (en) 2010-09-30 2011-09-08 Lens manufacturing method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-222624 2010-09-30
JP2010222624 2010-09-30

Publications (1)

Publication Number Publication Date
WO2012043190A1 true WO2012043190A1 (en) 2012-04-05

Family

ID=45892663

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/070527 WO2012043190A1 (en) 2010-09-30 2011-09-08 Method for manufacturing lens

Country Status (2)

Country Link
JP (1) JPWO2012043190A1 (en)
WO (1) WO2012043190A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013153940A1 (en) * 2012-04-09 2015-12-17 コニカミノルタ株式会社 Manufacturing method of optical components
WO2016098833A1 (en) * 2014-12-17 2016-06-23 コニカミノルタ株式会社 Optical element and light source device
JPWO2014045891A1 (en) * 2012-09-18 2016-08-18 コニカミノルタ株式会社 Mold, optical element manufacturing method, and optical element
JP2016147502A (en) * 2016-05-16 2016-08-18 日本ゼオン株式会社 Mold for molding optical lens and method for producing optical lens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0292606A (en) * 1988-09-30 1990-04-03 Olympus Optical Co Ltd Mold for injection molding
JP2002219734A (en) * 2001-01-25 2002-08-06 Alps Electric Co Ltd Resin-molded optical member and fitting structure thereof
JP2006181830A (en) * 2004-12-27 2006-07-13 Mitsubishi Electric Corp Gate-treated molding
JP2007001054A (en) * 2005-06-21 2007-01-11 Ipm:Kk Injection molding mold and injection molding method
JP2007121512A (en) * 2005-10-26 2007-05-17 Enplas Corp Optical element and optical element molding die
JP2008119890A (en) * 2006-11-09 2008-05-29 Jsr Corp Method for producing thin optical lens molding

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0292606A (en) * 1988-09-30 1990-04-03 Olympus Optical Co Ltd Mold for injection molding
JP2002219734A (en) * 2001-01-25 2002-08-06 Alps Electric Co Ltd Resin-molded optical member and fitting structure thereof
JP2006181830A (en) * 2004-12-27 2006-07-13 Mitsubishi Electric Corp Gate-treated molding
JP2007001054A (en) * 2005-06-21 2007-01-11 Ipm:Kk Injection molding mold and injection molding method
JP2007121512A (en) * 2005-10-26 2007-05-17 Enplas Corp Optical element and optical element molding die
JP2008119890A (en) * 2006-11-09 2008-05-29 Jsr Corp Method for producing thin optical lens molding

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2013153940A1 (en) * 2012-04-09 2015-12-17 コニカミノルタ株式会社 Manufacturing method of optical components
JPWO2014045891A1 (en) * 2012-09-18 2016-08-18 コニカミノルタ株式会社 Mold, optical element manufacturing method, and optical element
WO2016098833A1 (en) * 2014-12-17 2016-06-23 コニカミノルタ株式会社 Optical element and light source device
JP2016147502A (en) * 2016-05-16 2016-08-18 日本ゼオン株式会社 Mold for molding optical lens and method for producing optical lens

Also Published As

Publication number Publication date
JPWO2012043190A1 (en) 2014-02-06

Similar Documents

Publication Publication Date Title
US8842376B2 (en) Plastic optical lens
WO2012043190A1 (en) Method for manufacturing lens
WO2010035619A1 (en) Method of producing objective lens for optical pickup, mold of objective lens for optical pickup, and objective lens for optical pickup
CN103524021B (en) A kind of manufacture method of aspherical lens of glass accurate die pressing
KR20110117117A (en) Lens and molding die
JP2010194780A (en) Injection molded product
KR20070084492A (en) Optical component production system
KR101359118B1 (en) Metal mold, optical device, process for manufacturing metal mold for forming optical device
US6008957A (en) Optical lens and method of making the same
JP5067664B2 (en) Mold for optical element and optical element
JP2009259393A (en) Molded lens
JP2007331311A (en) Optical element molding method
JP5760555B2 (en) Aperture array manufacturing apparatus and manufacturing method
JP2006150902A (en) Optical element, optical element molding die and manufacturing method of optical element
JP2008257261A (en) Optical device, optical device molding die, and method for molding optical device
JP2006347809A (en) Optical element and mold for forming optical element
JP4883331B2 (en) Optical element manufacturing method for optical pickup apparatus and optical element manufacturing apparatus for optical pickup apparatus
JPWO2012118041A1 (en) Optical element, molding die, and method of manufacturing optical element
CN102821924B (en) The manufacture method of mould, optical element and optical element
TW201408474A (en) Plastic lens with improved eccentricity and method for manufacturing the same
JP5254731B2 (en) Optical element molding die and optical element manufacturing method using the same
JP2017185759A (en) Plastic lens and manufacturing method thereof
JP2007265617A (en) Molded lens and die for molded lens
JP2010167614A (en) Die for formation of optical element
JP6179522B2 (en) Mold, optical element manufacturing method, and optical element

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11828751

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2012536314

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11828751

Country of ref document: EP

Kind code of ref document: A1