WO2012043190A1 - Method for manufacturing lens - Google Patents
Method for manufacturing lens Download PDFInfo
- 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
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- WO
- WIPO (PCT)
- Prior art keywords
- lens
- gate
- manufacturing
- optical
- gate portion
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 67
- 238000001746 injection moulding Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 17
- 238000000465 moulding Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007730 finishing process Methods 0.000 description 2
- 238000002271 resection Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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.
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- Engineering & Computer Science (AREA)
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- 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
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.
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.
〔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 moldedproduct 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.
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
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.
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.
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.
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)
- 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. - 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. .
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
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Cited By (4)
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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 |
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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 |
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