JP5927637B1 - Glass material for press molding, method for producing glass material for press molding, and method for producing optical element - Google Patents

Glass material for press molding, method for producing glass material for press molding, and method for producing optical element Download PDF

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JP5927637B1
JP5927637B1 JP2015124048A JP2015124048A JP5927637B1 JP 5927637 B1 JP5927637 B1 JP 5927637B1 JP 2015124048 A JP2015124048 A JP 2015124048A JP 2015124048 A JP2015124048 A JP 2015124048A JP 5927637 B1 JP5927637 B1 JP 5927637B1
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glass material
press molding
surface roughness
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JP2017007890A (en
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藤本　忠幸
忠幸 藤本
泰匡 和田
泰匡 和田
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Hoya Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/40—Product characteristics
    • C03B2215/46—Lenses, e.g. bi-convex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

【課題】プレス成形された光学素子の形状精度を損なうことなく、所望の光学性能を得ることができ、低コストに、プレス成形用ガラス素材、プレス成形用ガラス素材の製造方法、および光学素子の製造方法を提供すること。【解決手段】本発明によれば、表面粗さＲａが第１の表面粗さＲａ１である、少なくとも一つの凸面１０ａと、凸面の周囲に配置され、表面粗さＲａが第２の表面粗さＲａ２である側端面１１と、を備え、第２の表面粗さＲａ２は０．１０μｍ未満であり、かつ第２の表面粗さＲａ２は第１の表面粗さＲａよりも大きいプレス成形用ガラス素材１０が提供される。【選択図】図１[PROBLEMS] To obtain desired optical performance without impairing the shape accuracy of a press-molded optical element, and at a low cost, a method for producing a glass material for press molding, a glass material for press molding, and an optical element Providing a manufacturing method. According to the present invention, at least one convex surface 10a having a surface roughness Ra of a first surface roughness Ra1 and the periphery of the convex surface are disposed, and the surface roughness Ra is a second surface roughness. A glass material for press molding, the second surface roughness Ra2 being less than 0.10 μm, and the second surface roughness Ra2 being larger than the first surface roughness Ra. 10 is provided. [Selection] Figure 1

Description

本発明は、プレス成形用ガラス素材、及びプレス成形用ガラス素材の製造方法に関し、特に、少なくとも一つの凸面を有するプレス成形用ガラス素材、プレス成形用ガラス素材の製造方法、及び光学素子の製造方法に関する。   The present invention relates to a glass material for press molding and a method for manufacturing a glass material for press molding, and in particular, a glass material for press molding having at least one convex surface, a method for manufacturing a glass material for press molding, and a method for manufacturing an optical element. About.

少なくとも一つの凸面を有する光学素子（ガラスレンズ）を製造する方法の一つに、少なくとも一つの凸面を有するプレス成形用ガラス素材を成形型によりプレスする成形方法がある。   One method for producing an optical element (glass lens) having at least one convex surface is a molding method in which a glass material for press molding having at least one convex surface is pressed with a molding die.

芯取り工程等の冷間加工を経て形成されたプレス成形用ガラス素材の側端面は、一般に、鋭角的な凹凸を備えた砂摺り状の粗面を有している。このため、上記の成形方法では、プレス成形用ガラス素材の側端面から、鋭角的な凹凸の先端部が微小粒として脱離し、成形型上に落下することがある。そして、このような微小粒が、プレス成形中に、プレス成形用ガラス素材と成形型の間に入り込み、プレス成形された光学素子（ガラスレンズ）の表面に点状の不良部分を生じさせるという問題が生じていた。   The side end face of a glass material for press molding formed through cold working such as a centering process generally has a sand-sliding rough surface with acute irregularities. For this reason, in said shaping | molding method, the front-end | tip part of acute unevenness | corrugation may detach | leave from a side end surface of the glass material for press molding as a microparticle, and may fall on a shaping | molding die. And, such a fine particle enters between the glass material for press molding and the mold during press molding, and causes a point-like defective portion on the surface of the press-molded optical element (glass lens). Has occurred.

このような問題に対処すべく、プレス成形に先だって、プレス成形用ガラス素材の側端面を加熱して、鋭角的な凹凸を有する表面を溶融することにより、鋭角的な凹凸の先端部を鈍角化し、側端面からの微小粒の脱離を防止する処理が提案されている（特許文献１）。   In order to deal with such problems, prior to press forming, the side end face of the glass material for press molding is heated to melt the surface having acute unevenness, thereby obtuse the tip of acute unevenness. A process for preventing detachment of fine particles from the side end face has been proposed (Patent Document 1).

特開２０１１−１６６７５号公報JP 2011-16675 A

しかしながら、特許文献１に記載の処理を行った場合であっても、プレス成形用ガラス素材の側端面には、依然として凹凸形状が残存している。   However, even when the treatment described in Patent Document 1 is performed, the uneven shape still remains on the side end face of the glass material for press molding.

一方、プレス成形時では、プレス成形用ガラス素材が成形型によって変形させられていくとき、凸面に隣接する側端面が、成形型の成形面側に巻き込まれてプレスされ、プレス成形された光学素子（ガラスレンズ）の周縁部を構成することになる。   On the other hand, during press molding, when the glass material for press molding is deformed by the molding die, the side end surface adjacent to the convex surface is wound around the molding surface side of the molding die and pressed, and the optical element is press molded. The peripheral part of (glass lens) will be comprised.

凹凸形状が残存していた側端面がプレスされて成形された成形面は、形状不良を有するため、所望の光学性能が得られないという問題が生じていた。これにより、この形状不良を有する部分は廃棄せざるを得ず、無駄なガラス素材の増加、すなわちコスト増大を招いていた。   Since the molding surface formed by pressing the side end face where the uneven shape remained has a shape defect, there has been a problem that desired optical performance cannot be obtained. As a result, the portion having the defective shape has to be discarded, resulting in an increase in useless glass material, that is, an increase in cost.

本発明は、このような課題に鑑みなされたものであり、プレス成形された光学素子の形状精度を損なうことなく、所望の光学性能を得ることができ、低コストに、プレス成形用ガラス素材、プレス成形用ガラス素材の製造方法、および光学素子の製造方法を提供するものである。   The present invention has been made in view of such problems, and can obtain desired optical performance without impairing the shape accuracy of the press-molded optical element. A method for producing a glass material for press molding and a method for producing an optical element are provided.

本発明は、
表面粗さＲａが第１の表面粗さＲａ１である、少なくとも一つの凸面と、
前記凸面の周囲に配置され、表面粗さＲａが第２の表面粗さＲａ２である側端面と、を備え
第２の表面粗さＲａ２は０．１０μｍ未満であり、かつ第２の表面粗さＲａ２は第１の表面粗さＲａ１よりも大きい、プレス成形用ガラス素材、
に関する。 The present invention
At least one convex surface whose surface roughness Ra is the first surface roughness Ra1,
A side end surface disposed around the convex surface and having a surface roughness Ra of the second surface roughness Ra2, and the second surface roughness Ra2 is less than 0.10 μm and the second surface roughness Ra2 is larger than the first surface roughness Ra1, a glass material for press molding,
About.

さらに、本発明は、
少なくとも一つの凸面と、凸面の周囲に配置され、凸面の第１の表面粗さＲａよりも大きい表面粗さＲａの側端面と、を有するプレス成形用ガラス素材材料を準備する準備工程と、
側端面を表面粗さＲａが０．１０μｍ未満、かつ凸面の第１の表面粗さＲａより大きい表面粗さＲａになるように研磨する研磨工程と、を備える、プレス成形用ガラス素材の製造方法、
に関する。 Furthermore, the present invention provides
A preparatory step of preparing a glass material for press molding having at least one convex surface and a side end surface having a surface roughness Ra larger than the first surface roughness Ra of the convex surface disposed around the convex surface;
And a polishing step of polishing the side end face so that the surface roughness Ra is less than 0.10 μm and the surface roughness Ra is larger than the first surface roughness Ra of the convex surface. ,
About.

本発明に係るプレス成形用ガラス素材、及びプレス成形用ガラス素材の製造方法によれば、側端面の第２の表面粗さＲａ２が少なくとも一つの凸面の第１の表面粗さＲａ１よりも大きい場合において、第２の表面粗さＲａ２が０．１０μｍ未満となっている。そのため、凸面に隣接する側端面が、成形型の成形面側に巻き込まれてプレスされても、形状精度を損なうことなく、良好な光学性能を有する光学素子を得ることができる。   According to the glass material for press molding and the method for producing a glass material for press molding according to the present invention, when the second surface roughness Ra2 of the side end surface is larger than the first surface roughness Ra1 of at least one convex surface. , The second surface roughness Ra2 is less than 0.10 μm. Therefore, even when the side end surface adjacent to the convex surface is wound and pressed on the molding surface side of the mold, an optical element having good optical performance can be obtained without impairing the shape accuracy.

このような構成の本発明によれば、プレス成形された光学素子の形状精度を損なうことなく、所望の光学性能を得ることができ、低コストに、プレス成形用ガラス素材、プレス成形用ガラス素材の製造方法、および光学素子の製造方法を提供できる。   According to the present invention having such a configuration, a desired optical performance can be obtained without impairing the shape accuracy of the press-molded optical element, and the glass material for press molding and the glass material for press molding can be obtained at low cost. And a method for manufacturing an optical element can be provided.

プレス成形用ガラス素材の模式的な側面図である。It is a typical side view of the glass raw material for press molding. 芯取り加工を経た、砂摺り状の側端面を有するプレス成形用ガラス素材材料の断面図である。It is sectional drawing of the glass raw material for press molding which has a sand slide-like side end surface which passed through the centering process. プレス成形用ガラス素材材料の側端面に対する研磨時間と表面粗さＲａ２（第２の表面粗さ）との関係を示すグラフである。It is a graph which shows the relationship between polishing time with respect to the side end surface of the glass raw material for press molding, and surface roughness Ra2 (2nd surface roughness). 一面に凸面と、他面に平坦面と、凸面と平坦面との間の周囲に配置された側端面と、を備える、プレス成形用ガラス素材を示す断面図である。It is sectional drawing which shows the glass raw material for press molding provided with a convex surface on one surface, a flat surface on the other surface, and a side end surface disposed around the convex surface and the flat surface. 一面に凸面と、他面に凹面と、凸面と凹面との間の周囲に配置された側端面と、を備える、プレス成形用ガラス素材を示す断面図である。It is sectional drawing which shows the glass raw material for press molding provided with a convex surface on one surface, a concave surface on the other surface, and a side end surface arranged around the convex surface and the concave surface. プレス成形用ガラス素材材料の研磨工程の一例を説明する模式的な側面図である。It is a typical side view explaining an example of the grinding | polishing process of the glass raw material material for press molding.

以下、本発明のプレス成形用ガラス素材、プレス成形用ガラス素材の製造方法、及び光学素子の製造方法の一実施形態を、図面を参照しながら詳細に説明する。   Hereinafter, an embodiment of a glass material for press molding, a method for manufacturing a glass material for press molding, and a method for manufacturing an optical element of the present invention will be described in detail with reference to the drawings.

本明細書では、「プレス成形用ガラス素材」とは、主にモ―ルドプレス成形に用いられるガラス素材であって、冷間プリフォームを指すものとする。冷間プリフォームとは、芯取り加工等の冷間加工を経て形成されたプリフォームである。また、「プレス成形用ガラス素材材料」とは、本明細書での「プレス成形用ガラス素材」を形成するための前段階での冷間プリフォームであって、特に芯取り加工を経た砂摺り状の側端面を有する冷間プリフォームを指す。加えて、「プレス成形用ガラス素材材料」は、側端面が砂摺り状に比べて平坦化されてはいるものの、本発明において課題とするプレス成形後の光学素子の形状精度を確保する観点からは、プレス成形には適していない冷間プリフォームをも含むものとする。   In this specification, “a glass material for press molding” is a glass material mainly used for mold press molding, and refers to a cold preform. A cold preform is a preform formed through cold working such as centering. In addition, the “glass material for press molding” is a cold preform in the previous stage for forming the “glass material for press molding” in the present specification, and is particularly a sand slide that has undergone centering processing. Refers to a cold preform having a shaped side end face. In addition, the “glass material for press molding” has a side end surface that is flattened in comparison with a sand-sliding shape, but from the viewpoint of ensuring the shape accuracy of the optical element after press molding, which is a problem in the present invention. Includes cold preforms that are not suitable for press molding.

プレス成形用ガラス素材又はプレス成形用ガラス素材材料の「側端面」とは、プレス成形用ガラス素材又はプレス成形用ガラス素材材料の外周面だけでなく、その面取り部が設けられている場合は、その面取り部も含むものとする。
「表面粗さＲａ」とは、２００１年ＪＩＳ規格Ｂ６０１に基づく、算術平均粗さを指す。表面粗さＲａの測定は、ＪＩＳ規格に基づく方法で、既知の測定装置を用いて、測定することができる。 The `` side end surface '' of the glass material for press molding or the glass material for press molding is not only the outer peripheral surface of the glass material for press molding or the glass material for press molding, but when its chamfered portion is provided, The chamfer is also included.
“Surface roughness Ra” refers to the arithmetic average roughness based on the 2001 JIS standard B601. The surface roughness Ra can be measured by a method based on the JIS standard using a known measuring device.

（プレス成形用ガラス素材）
図１は、本実施形態のプレス成形用ガラス素材１０の模式的な側面図である。プレス成形用ガラス素材１０は、表面粗さＲａが第１の表面粗さＲａ１である、少なくとも一つの凸面１０ａと、凸面１０ａの周囲に配置され、表面粗さＲａが第２の表面粗さＲａ２である側端面１１と、を備え、第２の表面粗さＲａ２は０．１０μｍ未満であり、かつ第２の表面粗さＲａ２は第１の表面粗さＲａよりも大きい。 (Glass material for press molding)
FIG. 1 is a schematic side view of a glass material 10 for press molding according to the present embodiment. The press-molding glass material 10 is arranged around at least one convex surface 10a having a surface roughness Ra of the first surface roughness Ra1, and around the convex surface 10a, and the surface roughness Ra is a second surface roughness Ra2. The second surface roughness Ra2 is less than 0.10 μm, and the second surface roughness Ra2 is larger than the first surface roughness Ra.

また、プレス成形用ガラス素材１０の側端面１１は、凸面１０ａの外縁から外方に向けて連続して設けられている、凸面１０ａは、球面形状とすることができる。プレス成形用ガラス素材１０の形状は、例示として、凹メニスカス形状となっている。   Moreover, the side end surface 11 of the glass material 10 for press molding is provided continuously outward from the outer edge of the convex surface 10a. The convex surface 10a can have a spherical shape. The shape of the press-molding glass material 10 is, for example, a concave meniscus shape.

さらに、図１に示されるように、プレス成形用ガラス素材１０は、凸面１０ａと反対の面に配置され、側端面１１に連結された連結面４０と、をさらに備え、連結面４０の表面粗さＲａ（以下、「表面粗さＲａ３」と略す）は０．１０μｍ未満にすることができる。なお、図１では、連結面４０は、平面形状となっている。   Further, as shown in FIG. 1, the press-molding glass material 10 further includes a connection surface 40 disposed on the surface opposite to the convex surface 10 a and connected to the side end surface 11. The thickness Ra (hereinafter abbreviated as “surface roughness Ra3”) can be less than 0.10 μm. In FIG. 1, the connecting surface 40 has a planar shape.

なお、上記のとおり、側端面１１は、プレス成形用ガラス素材１０の外周面１１ａ及びその面取り部１１ｂを含む。   In addition, as above-mentioned, the side end surface 11 contains the outer peripheral surface 11a and the chamfer 11b of the glass raw material 10 for press molding.

本実施形態で用いられるプレス成形用ガラス素材１０は、例えば、ホウ酸及び希土類元素酸化物を主成分とする、ホウ酸ランタン系ガラスである。なお、本発明のプレス成形用ガラス素材の材料は、ホウ酸ランタン系ガラスに限定されるものではなく、例えば、リン酸塩を主成分とするリン酸塩ガラス、シリカを主成分とするシリカ系ガラスであってもよい。   The glass material 10 for press molding used in the present embodiment is, for example, lanthanum borate glass containing boric acid and a rare earth element oxide as main components. In addition, the material of the glass material for press molding of the present invention is not limited to lanthanum borate glass. For example, phosphate glass mainly containing phosphate, silica based silica Glass may also be used.

本実施形態のプレス成形用ガラス素材１０の物性は、側端面の研磨加工性の観点から、摩耗度（ＦA）が４００以下の材料を用いることが好ましい。プレス成形用ガラス素材１０の摩耗度（ＦA）は、２００以下がより好ましく、１００以下がさらに好ましい。 As the physical properties of the glass material 10 for press molding according to the present embodiment, it is preferable to use a material having an abrasion degree (F A ) of 400 or less from the viewpoint of polishing processability of the side end face. The abrasion degree (F A ) of the glass material 10 for press molding is more preferably 200 or less, and further preferably 100 or less.

同様に、側端面の研磨加工性の観点から、本実施形態のプレス成形用ガラス素材１０のヌープ硬さは、４００ＭＰａ以上が好ましい。プレス成形用ガラス素材１０のヌープ硬さは、５００ＭＰａ以上がさらに好ましく、６００ＭＰａ以上がより好ましい。   Similarly, the Knoop hardness of the glass material 10 for press molding of this embodiment is preferably 400 MPa or more from the viewpoint of polishing processability of the side end face. The Knoop hardness of the glass material 10 for press molding is more preferably 500 MPa or more, and more preferably 600 MPa or more.

なお、摩耗度（ＦA）及びヌープ硬さは、以下の手順により求められる。
摩耗度（ＦA）は、測定面積が９ｃｍ2の試料を、水平に毎分６０回転する鋳鉄製平面皿の中心より８０ｍｍの定位置に保持し、平均粒径２０μｍのアルミナ砥粒１０ｇに水２０ｍｌを添加したラップ液を５分間一様に供給し、９．８０７Nの荷重をかけてラップする。そして、ラップ前後の試料質量を秤量して求めた摩耗質量ｍと、日本光学硝子工業会で指定された標準試料（ＢＳＣ７）について同様に測定した摩耗質量ｍ0を次式にあてはめて算出される。
ＦA＝｛（ｍ／ｄ）／（ｍ0／ｄ0）｝×１００
ここで、ｄは試料の比重、ｄ0は標準試料（ＢＳＣ７）の比重である。 The degree of wear (F A ) and Knoop hardness are obtained by the following procedure.
The degree of wear (F A ) was determined by holding a sample having a measurement area of 9 cm 2 at a fixed position of 80 mm from the center of a flat plate made of cast iron that rotates horizontally 60 minutes per minute. The wrap solution added with 20 ml is uniformly supplied for 5 minutes, and a load of 9.807 N is applied to wrap. The wear mass m obtained by weighing the sample mass before and after the lap and the wear mass m 0 measured in the same manner for the standard sample (BSC7) designated by the Japan Optical Glass Industry Association are calculated by the following equation. .
F A = {(m / d) / (m 0 / d 0 )} × 100
Here, d is the specific gravity of the sample, and d 0 is the specific gravity of the standard sample (BSC7).

ヌープ硬さは、平面研磨されたガラス面に、対稜角が１７２°３０’及び１３０°の横断面が菱形のダイヤモンド四角錐圧子に０．９８０７Ｎの荷重を１５秒間かけてくぼみを付け、生じた永久くぼみの長い方の対角線の長さを測定して、次式により求められる。
Ｈｋ＝１．４５１・（Ｆ／ｌ2）
ここで、Ｆは荷重（Ｎ）、ｌはくぼみの長い方の対角線の長さ（ｍｍ）である。 Knoop hardness was caused by indenting a diamond quadrangular pyramid indenter having a cross-sectional angle of 172 ° 30 ′ and a 130 ° rhombus with a 0.9807 N load over 15 seconds on a flat-polished glass surface. The length of the diagonal line of the longer permanent depression is measured and is obtained by the following equation.
Hk = 1.451 · (F / l 2 )
Here, F is the load (N), and l is the length (mm) of the diagonal line with the longer recess.

次に、プレス成形用ガラス素材１０の側端面１１の表面粗さＲａ２及び凸面１０ａの表面粗さＲａ１と、プレス成形された光学素子の形状精度との関係について詳細に説明する。ここで、プレス成形用ガラス素材材料１０の側端面１１の表面粗さＲａ２の調整、すなわち平坦化は既知の研磨加工により行った。   Next, the relationship between the surface roughness Ra2 of the side end surface 11 and the surface roughness Ra1 of the convex surface 10a of the press-molding glass material 10 and the shape accuracy of the press-molded optical element will be described in detail. Here, the adjustment of the surface roughness Ra2 of the side end surface 11 of the glass material for press forming 10, that is, the flattening, was performed by a known polishing process.

図２は、芯取り加工を経た、一つの凸面１０ａ’と、凸面１０ａ’の周囲に配置された砂摺り状の側端面１１’と、を有するプレス成形用ガラス素材材料１０’の断面図である。プレス成形用ガラス素材材料１０’の形状は、例示として、図１と同様な凹メニスカス形状である。なお、側端面１１’の一端には、面取り部１１ｂが形成されている。なお、図１と図２の凸面１０ａと１０ａ’の表面粗さＲａ１は同じである。
また、図２に示されるように、プレス成形用ガラス素材材料１０’は、凸面１０ａ’の反対の面に、側端面１１’に連結された連結面４０’をさらに備えている。なお、図２では、連結面４０’は、平面形状となっている。 FIG. 2 is a cross-sectional view of a press-molding glass material 10 ′ having a single convex surface 10a ′ that has undergone centering and a sand slide-shaped side end surface 11 ′ disposed around the convex surface 10a ′. is there. The shape of the press-molding glass material 10 ′ is, for example, a concave meniscus shape similar to that of FIG. A chamfered portion 11b is formed at one end of the side end surface 11 ′. The surface roughness Ra1 of the convex surfaces 10a and 10a ′ in FIGS. 1 and 2 is the same.
As shown in FIG. 2, the glass material for press forming 10 ′ further includes a connection surface 40 ′ connected to the side end surface 11 ′ on the surface opposite to the convex surface 10 a ′. In FIG. 2, the connecting surface 40 ′ has a planar shape.

図３は、図２のプレス成形用ガラス素材材料１０’の側端面１１’に対する研磨時間と表面粗さＲａ２（第２の表面粗さ）との関係を示すグラフである。研磨時間は０〜３００ｓとした。なお、研磨時間０のＲａ２は、芯取り加工後の砂摺り状の側端面の表面ラフネスを意味する。表面粗さＲａ測定時の基準長さｌは、０．８５ｍｍとした。プレス成形用ガラス素材材料１０’には、ホウ酸ランタン系ガラスを用いた。なお、表面粗さＲａの測定には、Taylor Hobson社製Form Talysurf（型名：Laser 635）を用いた。   FIG. 3 is a graph showing the relationship between the polishing time and the surface roughness Ra2 (second surface roughness) for the side end face 11 'of the press-molding glass material 10' shown in FIG. The polishing time was 0 to 300 s. In addition, Ra2 of the grinding | polishing time 0 means the surface roughness of the sand-slip-shaped side end surface after a centering process. The reference length l when measuring the surface roughness Ra was 0.85 mm. Lanthanum borate glass was used as the glass material 10 'for press molding. For measurement of the surface roughness Ra, Form Talysurf (model name: Laser 635) manufactured by Taylor Hobson was used.

図３に示されるように、側端面の表面粗さＲａ２は、研磨時間が１２０ｓ以下では、研磨時間の増加に対し緩やかな減少傾向を示し、研磨時間が１２０ｓを超えると急激に低下した。そして、１４０ｓ以上において、０．１０μｍ未満となった。このことに対応し、研磨時間が１２０ｓを超え、１４０ｓ以上になると、側端面は目視においてクモリ面から光沢面へと変化していた。   As shown in FIG. 3, the surface roughness Ra2 of the side end face showed a gradual decrease tendency with respect to the increase of the polishing time when the polishing time was 120 s or less, and rapidly decreased when the polishing time exceeded 120 s. And it became less than 0.10 micrometer in 140 s or more. Corresponding to this, when the polishing time exceeded 120 s and became 140 s or more, the side end face was visually changed from the spider surface to the glossy surface.

表１は、各研磨時間に対する、側端面の表面粗さＲａ２、及びプレス成形用ガラス素材材料１０’をプレス成形した光学素子の形状精度の指標を示したものである。表１の「光学素子の形状精度」において、○は光学性能上、十分な形状精度が確保されていた場合、×は形状不良が生じていた場合を示す。また、表１には記載していないが、プレス成形用ガラス素材１０の凸面１０ａの表面粗さＲａ１は０．００２５μｍであった。   Table 1 shows the index of the surface roughness Ra2 of the side end face and the shape accuracy of the optical element obtained by press-molding the press-molding glass material 10 'for each polishing time. In “Shape accuracy of optical element” in Table 1, “◯” indicates a case where sufficient shape accuracy is ensured in terms of optical performance, and “×” indicates a case where a shape defect has occurred. Moreover, although not described in Table 1, the surface roughness Ra1 of the convex surface 10a of the glass material 10 for press molding was 0.0025 μm.

Figure 0005927637
Figure 0005927637

図３及び表１から、プレス成形用ガラス素材１０の側端面１１の表面粗さＲａ２は、光学素子の形状精度確保の観点から、０．１０μｍ未満であり、かつ表面粗さＲａ２は表面粗さＲａ１よりも大きいこと、が好ましいことがわかる。Ｒａ２の上限は、プレス成形後の光学素子の形状精度をより向上させる観点から、研磨時間２００ｓ〜３００ｓに対応する、表面粗さ０．０２０μｍ未満とすることがより好ましい。   From FIG. 3 and Table 1, the surface roughness Ra2 of the side end surface 11 of the glass material 10 for press molding is less than 0.10 μm from the viewpoint of ensuring the shape accuracy of the optical element, and the surface roughness Ra2 is the surface roughness. It can be seen that it is preferably larger than Ra1. The upper limit of Ra2 is more preferably less than the surface roughness of 0.020 μm corresponding to the polishing time of 200 s to 300 s, from the viewpoint of further improving the shape accuracy of the optical element after press molding.

さらに、図２に示されるような、凸面１０’と反対の面に配置され、側端面１１’に連結された連結面４０’を備えるプレス成形用ガラス素材材料１０’を用いる場合には、連結面４０’の表面粗さＲａ３を０．１０μｍ未満とすることが好ましい。このような連結面４０’を備えるプレス成形用ガラス素材材料１０’を用いる場合には、プレス成形時に、側端面１１’に加え、連結面４０’も成形型の成形面側に巻き込まれてプレスされ、プレス成形された光学素子の周縁部を構成する場合があるためである。   Furthermore, when using the glass material 10 'for press molding provided with the connection surface 40' arranged on the surface opposite to the convex surface 10 'and connected to the side end surface 11' as shown in FIG. The surface roughness Ra3 of the surface 40 ′ is preferably less than 0.10 μm. When using a glass material for press molding 10 ′ having such a connecting surface 40 ′, in addition to the side end surface 11 ′, the connecting surface 40 ′ is also wound on the molding surface side of the mold during press molding. This is because the peripheral portion of the press-molded optical element may be formed.

側端面１１’の表面粗さＲａ２及び側端面１１’に連結された連結面４０’の表面粗さＲａ３のそれぞれを０．１０μｍ以下にすることで、さらに光学素子の表面精度向上に寄与することができる。また、表面粗さＲａ３は、光学素子の形状精度をより向上させる観点から、０．０２０μｍ未満とすることがより好ましい。表面粗さＲａ３の下限は、特に制限は無いが、例えば０、又は凸面１０ａ’の表面粗さＲａ１とすることができる。なお、図２に示されるように、連結面４０’は、平面形状となっている。   By making each of the surface roughness Ra2 of the side end face 11 ′ and the surface roughness Ra3 of the connecting face 40 ′ connected to the side end face 11 ′ less than or equal to 0.10 μm, it contributes to further improving the surface accuracy of the optical element. Can do. The surface roughness Ra3 is more preferably less than 0.020 μm from the viewpoint of further improving the shape accuracy of the optical element. The lower limit of the surface roughness Ra3 is not particularly limited, but may be 0 or the surface roughness Ra1 of the convex surface 10a ', for example. As shown in FIG. 2, the connecting surface 40 'has a planar shape.

なお、本実施形態でのプレス成形用ガラス素材材料１０’には、ホウ酸ランタン系ガラスを用いたが、リン酸塩系ガラス、シリカ系ガラス等においても、表面粗さＲａ２、表面粗さＲａ１、及びプレス成形後の光学素子の形状精度の関係は、ホウ酸ランタン系ガラスを用いた場合と同様な結果を示した。   In addition, although the lanthanum borate glass was used for the glass raw material 10 ′ for press molding in the present embodiment, the surface roughness Ra2 and the surface roughness Ra1 are also used in phosphate glass, silica glass, and the like. The relationship between the shape accuracy of the optical element after press molding showed the same result as when lanthanum borate glass was used.

さらに、本実施形態では、凹メニスカス形状のプレス成形用ガラス素材を用いたが、一面及び他面の両面が凸面の形状や一面が凸面であって他面が平面である形状等のプレス成形用ガラス素材においても、表面粗さＲａ２、表面粗さＲａ１、及びプレス成形後の光学素子の形状精度の関係は、凹メニスカス形状のプレス成形用ガラス素材と同様な結果を示した。   Furthermore, in this embodiment, the concave meniscus-shaped glass material for press molding is used. However, one side and the other side are both convex and the other side is convex and the other side is flat. Also in the glass material, the relationship between the surface roughness Ra2, the surface roughness Ra1, and the shape accuracy of the optical element after press molding showed the same result as that of the glass material for press molding having a concave meniscus shape.

図４は、一面に凸面２０ａと、他面に平坦面２０ｂと、凸面２０ａと平坦面２０ｂとの間の周囲に配置された側端面２１と、を備える、プレス成形用ガラス素材２０を示す断面図である。本発明の課題である、プレス成形された光学素子の形状精度の悪化の度合いは、凸面２０ａの直径Ｄ１に対するプレス成形用ガラス素材２０の中心軸Ｏ方向の凸面の頂点から外周端までの距離Δｈ１の比（Δｈ１／Ｄ１）に依存する傾向がある。   FIG. 4 is a cross-sectional view showing a press-molding glass material 20 having a convex surface 20a on one surface, a flat surface 20b on the other surface, and a side end surface 21 disposed around the convex surface 20a and the flat surface 20b. FIG. The degree of deterioration of the shape accuracy of the press-molded optical element, which is the subject of the present invention, is the distance Δh1 from the vertex of the convex surface in the direction of the central axis O of the glass material 20 for press molding to the diameter D1 of the convex surface 20a. It tends to depend on the ratio (Δh1 / D1).

すなわち、このΔｈ１／Ｄ１とプレス成形後の光学素子の形状精度との関係を調べた結果、本発明の課題は、Δｈ１／Ｄ１が０．１５以上である場合に、より顕在化しやすいことがわかった。本発明は、凸面２０のΔｈ１／Ｄ１が０．１５以上の場合に、より好適である。Δｈ１／Ｄ１の上限は、特に制限はないが、例えば０．４０とすることができる。   That is, as a result of investigating the relationship between Δh1 / D1 and the shape accuracy of the optical element after press molding, it is found that the subject of the present invention is more obvious when Δh1 / D1 is 0.15 or more. It was. The present invention is more suitable when Δh1 / D1 of the convex surface 20 is 0.15 or more. The upper limit of Δh1 / D1 is not particularly limited, but can be set to 0.40, for example.

図５は、一面に凸面３０ａと、他面に凹面３０ｂと、凸面３０ａと凹面３０ｂとの間の周囲に配置された側端面３１と、を備える、プレス成形用ガラス素材３０を示す断面図である。本発明の課題は、図５に示すような一面に凸面及び他面に凹面を有する、プレス成形用ガラス素材を用いた場合に、さらに顕在化する傾向がある。   FIG. 5 is a cross-sectional view showing a press-molding glass material 30 including a convex surface 30a on one surface, a concave surface 30b on the other surface, and a side end surface 31 disposed around the convex surface 30a and the concave surface 30b. is there. The subject of the present invention tends to become more apparent when a glass material for press molding having a convex surface on one surface and a concave surface on the other surface as shown in FIG. 5 is used.

図５に示すような形状のプレス成形用ガラス素材３０では、下型の凹状成形面上にこのプレス成形用ガラス素材を配置し、上型を下降させてプレス成形用ガラス素材を加圧し、プレス成形用ガラス素材を上型の凸型形状の成形面に沿わせようとすると、凸型形状の成形面の中央部分が先行してプレス成形用ガラス素材に接触する。この状態で加圧を続けると、凸型形状の成形面の頂部からプレス成形用ガラス素材に加えられる圧力により、プレス成形用ガラス素材の外周縁が上方に向かって湾曲し、プレス成形用ガラス素材の外周部が、外周部と中央部の間の部分よりも先に凸型形状の成形面に接触してしまうからである。   In the press-molding glass material 30 having a shape as shown in FIG. 5, the press-molding glass material is disposed on the concave molding surface of the lower mold, the upper mold is lowered, and the press-molding glass material is pressurized. When the molding glass material is to be aligned with the convex surface of the upper convex shape, the central portion of the convex molding surface comes into contact with the press molding glass material first. If pressurization is continued in this state, the outer peripheral edge of the glass material for press molding is curved upward by the pressure applied to the glass material for press molding from the top of the convex molding surface, and the glass material for press molding This is because the outer peripheral portion of the contact portion comes into contact with the convex shaped molding surface before the portion between the outer peripheral portion and the central portion.

すなわち、凸面３０ａの直径Ｄ２に対するプレス成形用ガラス素材２０の中心軸Ｏ方向の凸面３０ａの頂点から外周端までの距離Δｈ２の比（Δｈ２／Ｄ２）、及び凹面の曲率半径Ｒ２に対する凸面の曲率半径Ｒ１の比（Ｒ１／Ｒ２）を系統的に変化させ、プレス成形後の光学素子の形状精度を調べた結果、本発明の課題はΔｈ２／Ｄ２が０．１５以上、及び、Ｒ１／Ｒ２が１／４以上、かつ２以下において、さらに顕在化することがわかった。   That is, the ratio (Δh2 / D2) of the distance Δh2 from the apex of the convex surface 30a in the direction of the central axis O of the press-molding glass material 20 to the outer peripheral end with respect to the diameter D2 of the convex surface 30a (Δh2 / D2), and the curvature radius of the convex surface with respect to the curvature radius R2 of the concave surface As a result of systematically changing the ratio of R1 (R1 / R2) and investigating the shape accuracy of the optical element after press molding, the subject of the present invention is that Δh2 / D2 is 0.15 or more and R1 / R2 is 1 / 4 or more and 2 or less.

本発明は、図５に示すような一面に凸面３０ａ及び他面に凹面３０ａを有するプレス成形用ガラス素材３０において、Δｈ２／Ｄ１の比が０．１５以上である場合、及び、Ｒ１／Ｒ２が１／４以上、かつ２以下である場合に、さらに好適である。Δｈ２／Ｄ２の上限は、特に制限はないが、例えば０．４０とすることができる。   In the press-molding glass material 30 having a convex surface 30a on one surface and a concave surface 30a on the other surface as shown in FIG. 5, the present invention has a ratio Δh2 / D1 of 0.15 or more, and R1 / R2 is It is more preferable when it is 1/4 or more and 2 or less. The upper limit of Δh2 / D2 is not particularly limited, but can be set to 0.40, for example.

（プレス成形用ガラス素材の製造方法、及び光学素子の製造方法）
次に、本実施形態のプレス成形用ガラス素材１０の製造方法について、図６を用いて説明する。図６は、プレス成形用ガラス素材１０の研磨工程の一例を説明する、模式的な側面図である。 (Method for producing glass material for press molding and method for producing optical element)
Next, the manufacturing method of the glass material 10 for press molding of this embodiment is demonstrated using FIG. FIG. 6 is a schematic side view for explaining an example of the polishing process of the glass material 10 for press molding.

本実施形態に係る製造方法は、少なくとも一つの凸面１０ａ’と、凸面１０ａ’の周囲に配置され、凸面１０ａ’の第１の表面粗さＲａよりも大きい表面粗さＲａの側端面１１’と、を有するプレス成形用ガラス素材材料１０’を準備する準備工程と、側端面１１’を、表面粗さＲａが０．１０μｍ未満、かつ凸面１０ａ’の第１の表面粗さＲａより大きい第２の表面粗さＲａになるように研磨する研磨工程と、を備える。   The manufacturing method according to the present embodiment includes at least one convex surface 10a ′ and a side end surface 11 ′ having a surface roughness Ra that is disposed around the convex surface 10a ′ and is larger than the first surface roughness Ra of the convex surface 10a ′. And a preparatory step of preparing a glass material for press forming 10 ′ having a second end surface 11 ′ having a surface roughness Ra of less than 0.10 μm and a convex surface 10a ′ greater than the first surface roughness Ra. And a polishing step of polishing so as to have a surface roughness Ra.

本実施形態のプレス成形用ガラス素材１０の製造方法では、まず、図２に示されているような、少なくとも一つの凸面１０ａ’と、この凸面の周囲に配置され、凸面１０ａ’よりも表面粗さＲａが大きい側端面１１’とを有するプレス成形用ガラス素材材料１０’が準備される（準備工程）。なお、このプレス成形用ガラス素材材料１０’は、既知の製造方法により製造された、冷間プリフォームである。   In the manufacturing method of the glass material 10 for press molding of this embodiment, first, as shown in FIG. 2, at least one convex surface 10a ′ and the periphery of the convex surface are arranged, and the surface roughness is larger than the convex surface 10a ′. A press-molding glass material 10 ′ having a side end face 11 ′ having a large thickness Ra is prepared (preparation step). The press-molding glass material 10 'is a cold preform manufactured by a known manufacturing method.

次に、プレス成形用ガラス素材材料１０’の側端面１１’の表面粗さＲａを０．１０μｍ未満、かつ凸面１０ａ’の第１の表面粗さＲａより大きい第２の表面粗さＲａになるように研磨する（研磨工程）。   Next, the surface roughness Ra of the side end face 11 ′ of the press-molding glass material 10 ′ is less than 0.10 μm, and the second surface roughness Ra is larger than the first surface roughness Ra of the convex surface 10a ′. Polishing (polishing step).

図６に示されるように、プレス成形用ガラス素材材料１０’の凸面１０ａ’側部分を、回転可能なプレス成形用ガラス素材材料固定用治具１４に固定する。次いで、パッド固定用治具１６に取付けられた研磨用パッド１４をプレス成形用ガラス素材材料１０’の側端面１１’に接触させた状態で、プレス成形用ガラス素材材料固定用治具１４を回転させ、プレス成形用ガラス素材材料１０’の側端面１１’と、研磨用パッド１２とを相対移動させて、側端面１１’を、表面粗さが０．１０μｍ未満、かつ凸面１０ａ’の表面粗さＲａ１より大きい表面粗さＲａ２になるまで研磨し、本実施形態のプレス成形用ガラス素材１０を得る。なお、面取り部１１ｂ’の研磨は、パッド固定用治具１６に取り付けられた研磨用パッド１０ｄの面を面取り部１０ｃの面取り角度に合わせて接触させることにより、同様に行なうことができる。連結面４０’の研磨についても、同様な方法により行うことができる。   As shown in FIG. 6, the convex surface 10 a ′ side portion of the press-molding glass material 10 ′ is fixed to a rotatable press-molding glass material material fixing jig 14. Next, the press molding glass material fixing jig 14 is rotated in a state where the polishing pad 14 attached to the pad fixing jig 16 is in contact with the side end face 11 ′ of the press molding glass material 10 ′. The side end face 11 ′ of the press-molding glass material 10 ′ and the polishing pad 12 are moved relative to each other so that the side end face 11 ′ has a surface roughness of less than 0.10 μm and a convex surface 10a ′. Polishing is performed until the surface roughness Ra2 is greater than the thickness Ra1, and the glass material 10 for press molding of the present embodiment is obtained. The chamfered portion 11b 'can be similarly polished by bringing the surface of the polishing pad 10d attached to the pad fixing jig 16 into contact with the chamfering angle of the chamfered portion 10c. The connection surface 40 ′ can be polished by a similar method.

プレス成形用ガラス素材材料１０’の側端面１１’は、表面粗さＲａ２が０．１０μｍ未満、かつ凸面１０ａ’の表面粗さＲａ１より大きい表面粗さＲａ２になるまで研磨される。
表面粗さＲａ２の上限は、プレス成形後の光学素子の形状精度をより向上させる観点から、０．０２０μｍ未満とすることが、より好ましい。 The side end face 11 ′ of the glass material for press forming 10 ′ is polished until the surface roughness Ra2 is less than 0.10 μm and the surface roughness Ra2 is larger than the surface roughness Ra1 of the convex surface 10a ′.
The upper limit of the surface roughness Ra2 is more preferably less than 0.020 μm from the viewpoint of further improving the shape accuracy of the optical element after press molding.

連結面４０の表面粗さＲａ３の上限は、０．１０μｍ未満、０．０２０μ未満の順に好ましい。表面粗さＲａ３の下限は、特に制限は無いが、例えば０、又は凸面１０ａ’の表面粗さＲａ１と同じ値にすることができる。   The upper limit of the surface roughness Ra3 of the connecting surface 40 is preferable in the order of less than 0.10 μm and less than 0.020 μm. The lower limit of the surface roughness Ra3 is not particularly limited, but can be 0 or the same value as the surface roughness Ra1 of the convex surface 10a ', for example.

なお、研磨用パッドには、例えば樹脂製のパッド、研磨剤には、例えば酸化セリウムを用いることができる。   For example, a resin pad can be used as the polishing pad, and cerium oxide can be used as the polishing agent.

プレス成形用ガラス素材１０を用いてプレス成形を行うプレス成形工程を含む、光学素子の製造方法が提供される。例えば、ＳＵＳ等の耐熱性及び耐腐食性を有する金属から形成され、凸形状の成形面を有する上型と、凹形状の成形面を有する下型等を備えた成型型を用い、プレス成形用ガラス素材をプレス成形することにより、光学素子が製造される。   A method for manufacturing an optical element is provided, which includes a press molding step of performing press molding using the glass material for press molding 10. For example, for press molding using a mold formed of a metal having heat resistance and corrosion resistance such as SUS and having an upper mold having a convex molding surface and a lower mold having a concave molding surface. An optical element is manufactured by press-molding a glass material.

本実施形態において用いることができるプレス成形用ガラス素材材料１０’は、（プレス成形用ガラス素材）で説明したものと同様である。すなわち、例えば、ホウ酸ランタン系ガラス、リン酸塩系ガラス、シリカ系ガラス、等である。   The press-molding glass material 10 'that can be used in the present embodiment is the same as that described in (Press-molding glass material). That is, for example, lanthanum borate glass, phosphate glass, silica glass, and the like.

また、プレス成形用ガラス素材材料１０’の好ましい物性（摩耗度（ＦA）、ヌープ硬さ）についても（プレス成形用ガラス素材）で説明したものと同様である。すなわち、プレス成形用ガラス素材材料１０’の摩耗度（ＦA）は、側端面の研磨加工性の観点から、４００以下が好ましく、２００以下がより好ましく、１００以下がさらに好ましい。プレス成形用ガラス素材材料１０’のヌープ硬さは、側端面の研磨加工性の観点から、４００ＭＰａ以上が好ましく、５００ＭＰａ以上がさらに好ましく、６００ＭＰａ以上がより好ましい。 Further, preferable physical properties (abrasion degree (F A ), Knoop hardness) of the glass material for press forming 10 ′ are the same as those described in (Press forming glass material). That is, the degree of wear (F A ) of the press-molding glass material 10 ′ is preferably 400 or less, more preferably 200 or less, and even more preferably 100 or less, from the viewpoint of polishing processability on the side end face. The Knoop hardness of the glass material 10 ′ for press molding is preferably 400 MPa or more, more preferably 500 MPa or more, and more preferably 600 MPa or more, from the viewpoint of polishing processability of the side end face.

プレス成形用ガラス素材１０は、側端面１１の表面粗さＲａが０．１０μｍ未満にされているので、プレス成形中に、凸面１０ａ’に隣接する側端面１１の端部が、成形型の成形面側に巻き込まれて、プレス成形された光学素子の周縁部を構成することになった場合でも、プレス成形後の光学素子の形状精度を損なうことなく、低コストに、所望の光学性能を有する光学素子を得ることができる。   In the glass material 10 for press molding, since the surface roughness Ra of the side end surface 11 is less than 0.10 μm, the end portion of the side end surface 11 adjacent to the convex surface 10a ′ is formed into a molding die during press molding. Even when it is wound on the surface side and constitutes the peripheral portion of the press-molded optical element, it has desired optical performance at low cost without impairing the shape accuracy of the optical element after press molding. An optical element can be obtained.

以下、図面を参照しながら、本発明を総括する。
プレス成形用ガラス素材１０は、表面粗さＲａが第１の表面粗さＲａ１である、少なくとも一つの凸面１０ａと、凸面１０ａの周囲に配置され、表面粗さＲａが第２の表面粗さＲａ２の側端面１１と、を備え、第２の表面粗さＲａ２は０．１０μｍ未満であり、かつ第２の表面粗さＲａ２は第１の表面粗さＲａ１よりも大きい。 The present invention will be summarized below with reference to the drawings.
The press-molding glass material 10 is arranged around at least one convex surface 10a having a surface roughness Ra of the first surface roughness Ra1, and around the convex surface 10a, and the surface roughness Ra is a second surface roughness Ra2. The second surface roughness Ra2 is less than 0.10 μm, and the second surface roughness Ra2 is larger than the first surface roughness Ra1.

そして、プレス成形用ガラス素材１０の製造方法は、少なくとも一つの凸面１０ａ’と、凸面１０ａ’の周囲に配置され、凸面１０ａ’の第１の表面粗さＲａよりも大きい表面粗さＲａの側端面１１’と、を有するプレス成形用ガラス素材材料１０’を準備する準備工程と、側端面１１’の表面粗さを０．１０μｍ未満、かつ凸面１０ａ’の第１の表面粗さＲａより大きい第２の表面粗さＲａになるように研磨する研磨工程と、を備えている。   And the manufacturing method of the glass raw material 10 for press molding is arrange | positioned around at least 1 convex surface 10a 'and convex surface 10a', and the surface roughness Ra side larger than 1st surface roughness Ra of convex surface 10a '. A preparation step of preparing a glass material for press molding 10 ′ having an end surface 11 ′, a surface roughness of the side end surface 11 ′ of less than 0.10 μm, and greater than a first surface roughness Ra of the convex surface 10a ′. And a polishing step for polishing to have the second surface roughness Ra.

１０、２０、３０：プレス成形用ガラス素材
１０ａ、２０ａ、３０ａ：凸面
１１：側端面
１１ａ、１１ａ’：外周面
１１ｂ、１１ｂ’：面取り部
１０’：プレス成形用ガラス素材材料
１０ａ’：プレス成形用ガラス素材材料の凸面
１１’：プレス成形用ガラス素材材料の側端面
１２：研磨用パッド
１４：プレス成形用ガラス素材材料固定用治具
１６：パッド固定用治具
２０ｂ：平坦面
３０ｂ：凹面
４０、４０’：連結面 10, 20, 30: Glass material for press molding 10a, 20a, 30a: Convex surface 11: Side end surface 11a, 11a ′: Outer peripheral surface 11b, 11b ′: Chamfered portion 10 ′: Glass material for press molding 10a ′: Press molding Convex surface 11 'of glass material for use: Side end surface 12 of glass material for press molding 12: Polishing pad 14: Fixing jig 16 for press forming glass material 20: Fixing jig 20b: Flat surface 30b: Concave surface 40 , 40 ': connecting surface

Claims (12)

表面粗さＲａが第１の表面粗さＲａ１である、少なくとも一つの凸面と、
前記凸面の周囲に配置され、表面粗さＲａが第２の表面粗さＲａ２である側端面と、を備え、
前記第２の表面粗さＲａ２は０．１０μｍ未満であり、かつ前記第２の表面粗さＲａ２は前記第１の表面粗さＲａよりも大きい、
プレス成形用ガラス素材。 At least one convex surface whose surface roughness Ra is the first surface roughness Ra1,
A side end surface disposed around the convex surface and having a surface roughness Ra of the second surface roughness Ra2.
The second surface roughness Ra2 is less than 0.10 μm, and the second surface roughness Ra2 is larger than the first surface roughness Ra.
Glass material for press molding. 前記側端面が、前記凸面の外縁から外方に向けて連続して設けられている、
請求項１に記載のプレス成形用ガラス素材。 The side end surface is continuously provided outward from the outer edge of the convex surface,
The glass material for press molding according to claim 1. 前記凸面と反対の面に配置され、前記側端面に連結された連結面と、をさらに備え、
前記連結面の表面粗さＲａが０．１０μｍ未満である、
請求項１または２に記載のプレス成形用ガラス素材。 A connecting surface disposed on a surface opposite to the convex surface and connected to the side end surface;
The connection surface has a surface roughness Ra of less than 0.10 μm.
The glass material for press molding according to claim 1 or 2. 前記プレス成形用ガラス素材の前記凸面の直径Ｄに対する前記プレス成形用ガラス素材の中心軸方向の前記凸面の頂点から前記側面端までの距離Δｈの比が０．１５以上である、
請求項１ないし３のいずれか１項に記載のプレス成形用ガラス素材。 The ratio of the distance Δh from the apex of the convex surface in the central axis direction of the press-molding glass material to the side surface end with respect to the diameter D of the convex surface of the press-molding glass material is 0.15 or more.
The glass material for press molding according to any one of claims 1 to 3. 前記凸面と反対の面に配置されている凹面をさらに備え、Further comprising a concave surface disposed on a surface opposite to the convex surface,
前記凹面の曲率半径に対する前記凸面の曲率半径の比が１／４以上、かつ２以下ある、The ratio of the radius of curvature of the convex surface to the radius of curvature of the concave surface is not less than 1/4 and not more than 2.
請求項４に記載のプレス成形用ガラス素材。  The glass material for press molding according to claim 4. 前記プレス成形用ガラス素材の摩耗度が４００以下である、
請求項１ないし５のいずれか１項に記載のプレス成形用ガラス素材。 The degree of wear of the glass material for press molding is 400 or less,
The glass material for press molding according to any one of claims 1 to 5. 前記プレス成形用ガラス素材の硬度が４００ＭＰａ以上である、
請求項１ないし６のいずれか１項に記載のプレス成形用ガラス素材。 The press-molding glass material has a hardness of 400 MPa or more,
The glass material for press molding according to any one of claims 1 to 6. 少なくとも一つの凸面と、前記凸面の周囲に配置され、前記凸面の第１の表面粗さＲａよりも大きい表面粗さＲａの側端面と、を有するプレス成形用ガラス素材材料を準備する準備工程と、
前記側端面を、表面粗さＲａが０．１０μｍ未満、かつ前記凸面の前記第１の表面粗さＲａより大きい第２の表面粗さＲａになるように研磨する研磨工程と、を備える、
プレス成形用ガラス素材の製造方法。 A preparing step of preparing a glass material for press molding having at least one convex surface and a side end surface having a surface roughness Ra larger than the first surface roughness Ra of the convex surface disposed around the convex surface; ,
Polishing the side end face so that the surface roughness Ra is less than 0.10 μm and the second surface roughness Ra is larger than the first surface roughness Ra of the convex surface.
A method for producing a glass material for press molding. 前記研磨工程が、研磨パッドと前記側端面とを相対移動させることによって行われる、
請求項８に記載のプレス成形用ガラス素材の製造方法。 The polishing step is performed by relatively moving the polishing pad and the side end surface.
The manufacturing method of the glass material for press molding of Claim 8. 前記プレス成形用ガラス素材の摩耗度が４００以下である、
請求項８または９に記載のプレス成形用ガラス素材の製造方法。 The degree of wear of the glass material for press molding is 400 or less,
The manufacturing method of the glass material for press molding of Claim 8 or 9. 前記プレス成形用ガラス素材の硬度が４００ＭＰａ以上である、
請求項８ないし１０のいずれか１項に記載のプレス成形用ガラス素材の製造方法。 The press-molding glass material has a hardness of 400 MPa or more,
The manufacturing method of the glass raw material for press molding of any one of Claims 8 thru | or 10. 請求項１ないし７のいずれか１項に記載のプレス成形用ガラス素材を用いてプレス成形を行うプレス成形工程を含む、光学素子の製造方法。   The manufacturing method of an optical element including the press molding process of performing press molding using the glass raw material for press molding of any one of Claim 1 thru | or 7.
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