WO2009096230A1 - 光学素子の製造方法及び光学素子 - Google Patents
光学素子の製造方法及び光学素子 Download PDFInfo
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- WO2009096230A1 WO2009096230A1 PCT/JP2009/050444 JP2009050444W WO2009096230A1 WO 2009096230 A1 WO2009096230 A1 WO 2009096230A1 JP 2009050444 W JP2009050444 W JP 2009050444W WO 2009096230 A1 WO2009096230 A1 WO 2009096230A1
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- Prior art keywords
- gate
- optical element
- air vent
- cut
- molded
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- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/02—Deburring or deflashing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- 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
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
- B29C2045/0058—Shaping removing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
Definitions
- the present invention relates to an optical element manufacturing method and an optical element.
- an objective lens of an optical pickup apparatus that records and reproduces information using an information recording medium such as a CD or DVD is manufactured by molding a resin material using a molding die 100 as shown in FIG. Has been.
- the forming die 100 has a fixed die 101 and a movable die 102 that can be moved toward and away from the fixed die 101 in the X direction.
- a cavity 104 for molding the resin material into the shape of the objective lens By bringing the fixed mold 101 and the movable mold 102 into contact with each other, a cavity 104 for molding the resin material into the shape of the objective lens, a gate 103 for flowing the resin material into the cavity 104, and a cavity for spreading the resin material
- An air vent 105 and the like for releasing the air in the cavity 104 to the outside of the cavity 104 are formed on the back side of the 104.
- the objective lens of the optical pickup device has a larger numerical aperture NA.
- An objective lens having a large numerical aperture NA has a shape that swells in the thickness direction more than that of a conventional lens. Therefore, it is necessary to spread the resin material more reliably in the cavity during molding.
- the resin material is surely spread in the cavity swelled in the thickness direction, in the molded product, in addition to the gate molded portion described above, the cured portion of the resin material in the air vent, that is, the air vent burr is formed. It will be formed large. Since the air vent burr is formed large and integrated with the objective lens, the air vent burr is caught by the lens case for conveyance, making it difficult to put in and out the objective lens, or breaking from the objective lens part during conveyance The surface may be scratched, dusted and adhered to the lens surface, or may interfere with the assembly of the optical pickup device.
- An object of the present invention is to provide an optical element manufacturing method and an optical element that can eliminate an air vent burr and can identify a gate side position at the time of molding.
- the invention described in claim 1 is a method of manufacturing an optical element, An optical element molded by a cavity, a gate molding part molded by a gate, and an air vent burr molded by an air vent are formed into a molded product having the cavity, the gate, and the air vent. Molding process using resin material, The step of removing the gate molded part and the air vent burrs from the molded product, and cutting the base parts of the gate molded part and the air vent burrs into different shapes, To produce an optical element.
- the invention described in claim 2 is the method of manufacturing an optical element according to claim 1, In the cutting step, While cutting the base part of the gate molding part over the entire width of the molded product, The base portion of the air vent burr is cut only in a part in the thickness direction of the molded product.
- the invention described in claim 3 is the method of manufacturing an optical element according to claim 1, In the cutting step, While cutting the base of the gate molding part only about a part in the thickness direction of the molding, The base of the air vent burr is cut across the entire width in the thickness direction of the molded product.
- the invention described in claim 4 is the method of manufacturing an optical element according to claim 1, In the cutting step, While cutting the base part of the gate molding part into a D-cut shape or a U-cut shape over the entire width in the thickness direction of the molded product, The base portion of the air vent burr is cut into an arc cut shape over the entire width in the thickness direction of the molded product.
- the invention according to claim 5 is the method of manufacturing an optical element according to claim 1, In the cutting step, While cutting the base of the gate molding part into a D-cut shape or a U-cut shape for only a part in the thickness direction of the molded product, The base portion of the air vent burr is cut into an arc cut shape only for a part in the thickness direction of the molded product.
- the invention according to claim 6 is an optical element,
- the optical element is manufactured by the method for manufacturing an optical element according to any one of claims 1 to 5.
- the invention of claim 7 is an optical element for an optical pickup device,
- the gate cut part and the air vent cut part have different shapes.
- the air vent burr since the base of the air vent burr is cut so that the air vent burr formed by the air vent is removed from the molded product obtained from the molding process, the air vent burr can be eliminated from the optical element. .
- the gate molded part and the air vent burr bases are cut into different shapes, so that the gate side position at the time of molding can be identified after cutting. Therefore, the optical element can be accurately arranged at the time of manufacturing the optical device.
- FIG. 1 is a conceptual diagram showing a schematic configuration of an optical pickup device 1 in which an optical element according to the present invention is used as an objective lens.
- the optical pickup device 1 includes a semiconductor laser oscillator 2.
- the semiconductor laser oscillator 2 is a light source of a so-called blue-violet laser having a use wavelength of 405 nm.
- the collimator 3, the beam splitter 4, and the quarter are separated in a direction away from the semiconductor laser oscillator 2 (from the bottom to the top in the figure).
- a wave plate 5, a diaphragm 6, and an objective lens 7 are sequentially arranged.
- the objective lens 7 is disposed at a position facing the optical disc D, and condenses the laser light emitted from the semiconductor laser oscillator 2 on the surface of the optical disc D.
- the objective lens 7 in this embodiment is mounted on a two-dimensional actuator (bobbin) 10 via a flange portion 7b formed in an annular shape around the lens body 7a. It is free to move on.
- the optical disk D is a so-called “high-density optical disk”, which has a protective substrate thickness of 0.1 mm and a storage capacity of about 30 GB.
- the magnitude of the thickness and the information pits of the protection of the optical disc D substrate D 1, unlike aperture NA required for the objective lens 7, in the present embodiment, the numerical aperture NA is set to 0.85.
- a sensor lens group 8 and a sensor 9 including two lenses are sequentially arranged on the side (right side in the drawing) of the beam splitter 4.
- the optical pickup device 1 in the present embodiment emits laser light from the semiconductor laser oscillator 2 at the time of recording information on the optical disc D or at the time of reproducing information recorded on the optical disc D.
- the emitted laser light becomes a light beam L 1 , is collimated to infinite parallel light through the collimator 3, then passes through the beam splitter 4, and is a quarter wavelength plate 5. Transparent.
- the aperture 6 and the objective lens 7 After sequentially passing through the aperture 6 and the objective lens 7 to form a converged spot on the information recording surface D 2 through the protective substrate D 1 of the optical disc D.
- the light that forms the condensed spot is modulated by the information pits on the information recording surface D 2 of the optical disc D and reflected by the information recording surface D 2 .
- the reflected light becomes a light beam L 2 and sequentially passes through the objective lens 7 and the diaphragm 6, and then the polarization direction is changed by the quarter wavelength plate 5 and reflected by the beam splitter 4.
- astigmatism is given through the sensor lens group 8 and is received by the sensor 9, and finally is subjected to photoelectric conversion by the sensor 9 to become an electrical signal.
- a molding 70 integrally including the objective lens 7 is molded from a resin material using a molding die 100 (molding process).
- a molding die 100 molding process
- an air vent burr 72a (see FIG. 2) described later is formed to be large.
- the molten resin material is caused to flow into the cavity 104 from the gate 103 in a state where the movable mold 102 is in contact with the fixed mold 101.
- the air in the cavity 104 is driven out of the cavity 104 through the air vent 105, and the resin material is cured in a state of reaching the cavity 104.
- the objective lens 7 formed by the cavity 104, the gate forming portion 71 formed by the gate 103, and the air vent burr 72 formed by the air vent 105 are integrally formed as a molded product 70.
- the gate molding portion 71 is continuously provided with a rod-shaped resin portion (hereinafter referred to as a rod-shaped portion) cured inside the sprue or runner (not shown) of the mold 100. Is provided.
- the molded product 70 is taken out from the molding die 100 by holding the rod-shaped portion, and the rod-shaped portion is cut from the gate molding portion 71 with a metal rotary saw or the like. .
- a gate cut portion 71a and a cut portion of the air vent burr 72 are formed (cut process).
- the end portion E is used to place the base 720 of the air vent burr 72 in the thickness direction of the molded product 70 (the optical axis direction of the objective lens 7). Only a part (the upper part in the figure) is cut in an arc shape, that is, the gate is cut in a substantially arc shape along the outer periphery of the lens, and the base portion 710 of the gate molding portion 71 is formed in the thickness direction of the molding 70. Cut into a circular cut shape over the entire width.
- the cutting position is adjusted so that the center position of the gate forming portion 71 is the center of the gate cut portion 71a in the circumferential direction of the molded product 70. 3 and 4 and FIG. 5 described later, the optical surface of the objective lens 7 is simplified and flattened.
- the air vent burr 72 is formed to be biased toward one optical surface side of the objective lens 7 (see FIG. 3A), and the end mill E is pressed obliquely with respect to the thickness direction of the molded product 70. As a result, the air vent burr 72 is cut.
- a method for moving the end mill E when cutting the gate forming portion 71 for example, a method disclosed in Japanese Patent Application Laid-Open No. 2005-161564 can be used.
- chucking means for gripping the molded product 70, and the end mill E and the chucking means are automatically moved by numerical control. Conventionally known devices such as a movable table can be used.
- the objective lens 7 from which the gate forming portion 71 and the air vent burr 72 are removed as shown in FIG. 5 is manufactured.
- the base 720 of the air vent burr 72 is cut so that the air vent burr 72 formed by the air vent 105 is removed from the formed product 70 out of the formed product 70 obtained by molding.
- the air vent burr 72 can be eliminated from the objective lens 7.
- the gate molded portion 71 and the bases 710 and 720 of the air vent burrs 72 are cut into different shapes, that is, the gate cut portion 71a (the gate molded portion 71 in the objective lens 7 (optical element) is removed).
- Part) and the air vent cut part 72a are formed in different shapes, so that the position on the gate 103 side during molding can be identified even after the cutting process. be able to. Therefore, when the objective lens 7 is fixed to the two-dimensional actuator 10, the accurate position of the original gate forming portion 71 can be used as a positioning reference. That is, the objective lens 7 can be accurately arranged.
- the base portion 710 of the gate forming portion 71 is cut so that the center position of the gate forming portion 71 is the center of the gate cut portion 71a in the circumferential direction of the molded product 70, the position of the original gate forming portion 71 is more accurately determined. It can be made identifiable after cutting. Therefore, the objective lens 7 can be disposed more accurately.
- flash 72 formed biased to the one optical surface side of the objective lens 7 is cut only about a part of the thickness direction, as shown in FIG. 6, when cutting over the full width of the thickness direction ( Unlike FIG. 6B, the side peripheral surface of the objective lens 7 positioned above or below the air vent cut portion 72a can be in an uncut state (see FIG. 6A). Accordingly, even when the objective lens 7 is downsized and the contact area with the two-dimensional actuator 10 is small, the contact area with the two-dimensional actuator 20 is prevented from being further reduced by the cut of the air vent burr 72 and the objective lens 7 is fixed to the two-dimensional actuator 20. Can be stabilized.
- the optical element of the present invention is an objective lens having an NA of 0.75 or more and 0.9 or less, an air vent burr is more likely to occur, and thus the effect of the present invention becomes more remarkable.
- d represents the thickness (mm) on the optical axis of the optical element
- f represents the focal length (mm) at the used wavelength of the optical pickup device in which the optical element is used.
- the wavelength used is preferably 390 nm or more and 420 nm or less.
- the gate forming portion 71 is cut into an arc cut shape over the entire width in the thickness direction of the molded product 70, and the air vent burr 72 is cut into an arc cut shape only for a part thereof.
- the gate forming portion 71 and the base portions 710 and 720 of the air vent burr 72 are cut into different shapes, they may be cut into other shapes as shown in FIG. Even in these cases, since the gate forming portion 71 and the base portions 710 and 720 of the air vent burr 72 are cut into different shapes, the position on the gate 103 side at the time of forming can be identified even after cutting, and the optical pickup device The objective lens 7 can be accurately arranged at the time of manufacturing 1.
- full width means that cutting is performed over the entire width in the thickness direction of the molded product 70
- part means that only a part of the molded product 70 in the thickness direction is cut.
- D cut in FIG. 7 means that the base 710 (or base 720) of the gate forming portion 71 (or the air vent burr 72) is cut into a D cut shape.
- FIG. As shown in b) and (c), it means a cutting method in which the base portion 710 (or the base portion 720) is removed in a straight line to form the molded product 70 as a whole in a substantially D shape when viewed from the front.
- the cut may be performed by applying the end mill E to the molded product 70 in parallel with the tangential direction of the optical surface. You may cut by making it apply to the molding 70 in parallel with the thickness direction.
- U-cut in FIG. 7 means that the base 710 (or the base 720) of the gate forming portion 71 (or the air vent burr 72) is cut into a U-cut shape.
- FIG. 3 (b) shows the positional relationship at the time of cutting between the end mill E and the molded product 70 when the end mill E is a small cylinder
- FIG. 3 (b) shows the case where the end mill E is tapered. The positional relationship at is shown.
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
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- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
キャビティで成形される光学素子と、ゲートで成形されるゲート成形部と、エアベントで成形されるエアベントバリと、が一体化された成形物を、前記キャビティ、前記ゲート及び前記エアベントを有する成形型を用いて樹脂材料から成形する成形工程と、
前記成形物から、前記ゲート成形部と前記エアベントバリとを除去し、前記ゲート成形部及び前記エアベントバリの各基部を互いに異なる形状にカットするカット工程と、
によって光学素子を製造することを特徴とする。
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の全幅に亘ってカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の一部のみについてカットすることを特徴とする。
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の一部のみについてカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の全幅に亘ってカットすることを特徴とする。
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の全幅に亘ってDカット形状またはUカット形状にカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の全幅に亘って円弧カット形状にカットすることを特徴とする。
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の一部のみについてDカット形状またはUカット形状にカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の一部のみについて円弧カット形状にカットすることを特徴とする。
請求の範囲第1項~第5項の何れか一項に記載の光学素子の製造方法によって製造されたことを特徴とする。
ゲートカット部とエアベントカット部との形状が互いに異なることを特徴とする。
70 成形物
71 ゲート成形部
72 エアベントバリ
100 成形型
103 ゲート
104 キャビティ
105 エアベント
710 ゲート成形部の基部
720 エアベントバリの基部
1.1<d/f<2.0
但し、dは光学素子の光軸上の厚み(mm)を表し、fは光学素子が用いられる光ピックアップ装置の使用波長での焦点距離(mm)を表す。尚、使用波長は、390nm以上、420nm以下であることが好ましい。
Claims (7)
- キャビティで成形される光学素子と、ゲートで成形されるゲート成形部と、エアベントで成形されるエアベントバリと、が一体化された成形物を、前記キャビティ、前記ゲート及び前記エアベントを有する成形型を用いて樹脂材料から成形する成形工程と、
前記成形物から、前記ゲート成形部と前記エアベントバリとを除去し、前記ゲート成形部及び前記エアベントバリの各基部を互いに異なる形状にカットするカット工程と、
によって光学素子を製造することを特徴とする光学素子の製造方法。 - 請求の範囲第1項記載の光学素子の製造方法において、
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の全幅に亘ってカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の一部のみについてカットすることを特徴とする光学素子の製造方法。 - 請求の範囲第1項記載の光学素子の製造方法において、
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の一部のみについてカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の全幅に亘ってカットすることを特徴とする光学素子の製造方法。 - 請求の範囲第1項記載の光学素子の製造方法において、
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の全幅に亘ってDカット形状またはUカット形状にカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の全幅に亘って円弧カット形状にカットすることを特徴とする光学素子の製造方法。 - 請求の範囲第1項記載の光学素子の製造方法において、
前記カット工程では、
前記ゲート成形部の基部を、前記成形物の厚み方向の一部のみについてDカット形状またはUカット形状にカットするとともに、
前記エアベントバリの基部を、前記成形物の厚み方向の一部のみについて円弧カット形状にカットすることを特徴とする光学素子の製造方法。 - 請求の範囲第1項~第5項の何れか一項に記載の光学素子の製造方法によって製造されたことを特徴とする光学素子。
- 光ピックアップ装置用の光学素子であって、
ゲートカット部とエアベントカット部との形状が互いに異なることを特徴とする光学素子。
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JP2010076196A (ja) * | 2008-09-25 | 2010-04-08 | Konica Minolta Opto Inc | 凸部の除去方法及びレンズ |
JP2011204335A (ja) * | 2010-03-26 | 2011-10-13 | Konica Minolta Opto Inc | 光学素子の製造方法、光学素子、及び対物レンズ |
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TWI476092B (zh) * | 2012-07-05 | 2015-03-11 | Largan Precision Co Ltd | 光學塑膠鏡片及其射出成型方法 |
JP7215399B2 (ja) * | 2019-11-18 | 2023-01-31 | 株式会社デンソー | 成型体及びその製造方法 |
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- 2009-01-15 CN CN2009801034430A patent/CN101932423A/zh active Pending
- 2009-01-15 JP JP2009551460A patent/JPWO2009096230A1/ja active Pending
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JP2003211500A (ja) * | 2002-01-23 | 2003-07-29 | Matsushita Electric Ind Co Ltd | プラスチックレンズの成形金型及び成形方法 |
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JP2005084080A (ja) * | 2003-09-04 | 2005-03-31 | Matsushita Electric Ind Co Ltd | プラスチックレンズの製造方法 |
JP2006039012A (ja) * | 2004-07-23 | 2006-02-09 | Hitachi Maxell Ltd | プラスチックレンズ及びプラスチックレンズの製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010076196A (ja) * | 2008-09-25 | 2010-04-08 | Konica Minolta Opto Inc | 凸部の除去方法及びレンズ |
JP2011204335A (ja) * | 2010-03-26 | 2011-10-13 | Konica Minolta Opto Inc | 光学素子の製造方法、光学素子、及び対物レンズ |
Also Published As
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CN101932423A (zh) | 2010-12-29 |
JPWO2009096230A1 (ja) | 2011-05-26 |
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