JP2009001483A - Method of manufacturing cylindrical glass lens with inclined surface - Google Patents

Method of manufacturing cylindrical glass lens with inclined surface Download PDF

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JP2009001483A
JP2009001483A JP2008173479A JP2008173479A JP2009001483A JP 2009001483 A JP2009001483 A JP 2009001483A JP 2008173479 A JP2008173479 A JP 2008173479A JP 2008173479 A JP2008173479 A JP 2008173479A JP 2009001483 A JP2009001483 A JP 2009001483A
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mold
glass lens
cylindrical glass
inclined plane
spherical
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Minoru Sekine
実 関根
Masatoshi Oyama
正敏 大山
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AGC Inc
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Asahi Glass Co Ltd
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    • 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
    • C03B2215/49—Complex forms not covered by groups C03B2215/47 or C03B2215/48
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type

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  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a cylindrical glass lens with an inclined surface in which occurrence of crack is suppressed and whose degree of freedom in designing is high and whose performance is high. <P>SOLUTION: In the method of manufacturing the cylindrical glass lens with the inclined surface, the cylindrical glass lens with the inclined surface in which the shape of one surface is spherical or aspheric and the shape of another surface is inclined flat surface which is inclined from a vertical face with respect to an optical axis is press-molded by filling a glass material in a mold. The mold comprises a mold 7 on the inclined plane side, a mold 10 on the spherical surface side or aspheric surface side, a ring mold 13 for forming the side surface part of the cylindrical glass lens with the inclined surface and a drum mold 14 for holding the mold of the inclined surface side and the mold of the spherical surface side or the aspheric surface side. The mold of the inclined surface side is provided with a plane zone 9 to be nearly parallel with the surface vertical to the optical axis on a part of the inclined surface and the plane zone is provided at a position other than the effective diameter of luminous flux passed through the cylindrical glass lens with the inclined surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、光軸に対して傾いた平面を有する斜面付円柱ガラスレンズに関し、特にガラスレンズの光の入射側および出射側の２表面のうち一方の表面が球面または非球面形状を有し、他方の表面が光軸に対して垂直ではない傾斜平面を有する斜面付円柱ガラスレンズの製造方法に関する。   The present invention relates to a cylindrical glass lens with a slope having a plane inclined with respect to the optical axis, and in particular, one of the two surfaces on the light incident side and the light exit side of the glass lens has a spherical or aspherical shape, The present invention relates to a method of manufacturing a sloped cylindrical glass lens having an inclined plane whose other surface is not perpendicular to the optical axis.

一般的な円柱ガラスレンズはその光軸方向に光束を収斂したり、光軸方向に発散光を平行化するため、屈折率分布を持たない光学的に均質な材料の場合、その光線が入出射する両端面は鏡面に近い面精度および面粗度を有し、かつ、少なくとも一方の面は凸面形状を有することが多い。さらに、最近は光ピックアップや光通信分野などにおいて、傾斜平面を有して入射光線を偏向させる効果を有する斜面付円柱ガラスレンズも見られる。
このような、一方に傾斜平面を有し、他方は高精度な球面または非球面を有する斜面付円柱ガラスレンズを製作する場合、従来ではそれぞれ対応する傾斜平面金型と球面または非球面金型を製作して金型を成形機に搭載し、ガラス材料を充填してプレスする方法が一般的であった。 A general cylindrical glass lens converges the light beam in the optical axis direction or collimates the divergent light in the optical axis direction. Therefore, in the case of an optically homogeneous material having no refractive index distribution, the light beam enters and exits. In many cases, both end surfaces have surface accuracy and surface roughness close to mirror surfaces, and at least one surface has a convex shape. Furthermore, recently, a cylindrical glass lens with a slope having an inclined plane and having an effect of deflecting incident light is also seen in the optical pickup and optical communication fields.
When manufacturing such a sloped cylindrical glass lens having an inclined plane on one side and a highly accurate spherical or aspherical surface on the other side, conventionally, a corresponding inclined plane mold and spherical or aspherical mold are respectively used. A method of manufacturing and mounting a mold on a molding machine, filling a glass material, and pressing is common.

従来の成形金型構造の一例を図３に示す。傾斜金型平面１６を有する傾斜平面側の金型１７と、球面または非球面を生成する曲面金型面１８を有する球面または非球面側の金型１９と、リング金型１３および胴型１４とで構成される従来の金型構造により斜面付円柱ガラスレンズ１５が作成される。ここで、光軸（中心軸）にほぼ垂直な平面と傾斜平面のなす傾斜角度θとする。   An example of a conventional molding die structure is shown in FIG. An inclined plane side mold 17 having an inclined mold plane 16, a spherical or aspherical mold 19 having a curved mold surface 18 for generating a spherical surface or an aspheric surface, a ring mold 13 and a body mold 14. The cylindrical glass lens 15 with a slope is created by the conventional mold structure comprised by these. Here, an inclination angle θ formed by a plane substantially perpendicular to the optical axis (center axis) and an inclined plane is assumed.

このプレス成形において、プレスの圧力方向と傾斜平面に垂直な方向が同軸上にはなく、互いに傾斜していることにより斜め方向のプレス圧力成分が生じる。このため、成形されたガラスレンズの傾斜平面に近いガラスレンズ内部に線状のクラック２０が発生して光学特性に大きな劣化を生じる問題があった。そして、この劣化傾向は同一のガラス材料においては、傾斜角度θが５°以上のときに発生しやすく、θが大きいほどクラックが大きくなり、傾斜角度を大きくできない問題があった。   In this press molding, the pressure direction of the press and the direction perpendicular to the inclined plane are not coaxial, and an inclined press pressure component is generated by inclining each other. For this reason, there is a problem that a linear crack 20 is generated inside the glass lens close to the inclined plane of the molded glass lens and the optical characteristics are greatly deteriorated. This deterioration tendency is likely to occur when the inclination angle θ is 5 ° or more in the same glass material. The larger the θ, the larger the cracks, and the inclination angle cannot be increased.

また、この傾斜平面を有するガラスレンズをプレス成形する場合、一方の傾斜平面金型や、他方の球面金型または非球面側の金型の周縁部が鋭角なエッジを有しているとき、成形回数の増加に伴い金型の鋭角な周縁部に欠けを生じて重大な不良発生や金型が使用不能になりやすい問題があった。   Also, when press molding a glass lens having this inclined plane, molding is performed when the peripheral edge of one inclined plane mold or the other spherical mold or aspherical mold has an acute edge. As the number of times increases, there is a problem that the sharp peripheral edge of the mold is chipped, causing serious defects and making the mold unusable.

本発明の目的は、前述の斜面付円柱ガラスレンズの傾斜角度を大きくしたガラスレンズをプレス成形によって製作する際に、傾斜平面付近のガラスレンズ内部に生じるクラックの発生を解消するとともに、金型の周縁部に欠けが発生して成形不良となる、また金型が使用不能になりやすい課題を解消することである。   The purpose of the present invention is to eliminate the occurrence of cracks in the glass lens near the inclined plane when the glass lens with the inclined angle of the cylindrical glass lens with the slope is increased by press molding, It is to solve the problem that chipping occurs in the peripheral edge portion, resulting in molding failure, and the mold is likely to be unusable.

さらに、上記の課題を解決することにより、傾斜平面を大きくした斜面付円柱ガラスレンズのプレス成形を可能にし、かつ、斜面付円柱ガラスレンズの傾斜平面側の金型や精密な球面または非球面側の金型の耐久性を増加することにより、傾斜平面を有する高生産性・高性能なガラスレンズを提供することである。   Furthermore, by solving the above-mentioned problems, it is possible to press-mold a sloped cylindrical glass lens with a large slope plane, and to provide a mold on the slope plane side of the sloped cylindrical glass lens or a precise spherical or aspherical side. It is to provide a high-productivity and high-performance glass lens having an inclined plane by increasing the durability of the mold.

本発明は、ガラスレンズを構成する光の入射側および出射側の２表面のうち、一方の表面の形状が球面または非球面であり、他方の表面の形状が、光軸に対して垂直な面から傾いている傾斜平面である斜面付円柱ガラスレンズを成形金型にガラス材料を充填してプレス成形する斜面付円柱ガラスレンズの製造方法であって、
前記成形金型は、傾斜平面側の金型と、球面または非球面側の金型と、前記斜面付円柱ガラスレンズの側面部を形成するリング金型と、前記傾斜平面側の金型と前記球面または非球面側の金型とを保持する胴型とで構成され、前記傾斜平面側の金型には、傾斜平面の一部に光軸と垂直な面にほぼ平行となるように面領域を設け、かつ前記面の領域が斜面付円柱ガラスレンズを通る光束の有効径以外の位置に設けられていることを特徴とする斜面付円柱ガラスレンズの製造方法を提供する。 In the present invention, of the two surfaces on the light incident side and light emission side constituting the glass lens, one surface has a spherical or aspherical shape, and the other surface has a surface perpendicular to the optical axis. It is a manufacturing method of a cylindrical glass lens with a slope, which is a cylindrical glass lens with a slope that is tilted from a mold, filled with a glass material in a molding die and press-molded.
The molding die includes a mold on the inclined plane side, a mold on the spherical or aspherical side, a ring mold that forms a side surface portion of the inclined cylindrical glass lens, the mold on the inclined plane side, and the mold A cylindrical mold that holds a spherical or aspherical mold, and the mold on the inclined plane side has a surface region so that a part of the inclined plane is substantially parallel to a plane perpendicular to the optical axis. And a region of the surface is provided at a position other than the effective diameter of the light beam passing through the inclined cylindrical glass lens.

さらに、前記傾斜平面と前記垂直な面とのなす角度が５°以上である上記の斜面付円柱ガラスレンズの製造方法を提供する。   Furthermore, the manufacturing method of the said cylindrical glass lens with a slope whose angle which the said inclined plane and the said perpendicular | vertical surface make is 5 degrees or more.

ガラスレンズを構成する光の入射側および出射側の２表面のうち、一方の表面が球面または非球面の形状を有し、他方の表面が光軸に対し傾斜する平面を有する斜面付円柱ガラスレンズのプレス成形において、従来の方法では傾斜角度の増大に伴いクラックが発生していたが、本発明によれば、光軸方向以外のプレス力成分を減少させることができるため、クラックの発生が抑制され、設計自由度が高く高性能な斜面付円柱ガラスレンズを生産性よく提供できる。   Of the two surfaces on the light incident side and light exit side constituting the glass lens, one surface has a spherical or aspherical shape, and the other surface has a plane with a plane inclined with respect to the optical axis. In the conventional press molding, cracks occurred with the increase of the tilt angle in the conventional method, but according to the present invention, the generation of cracks is suppressed because the pressing force component other than in the optical axis direction can be reduced. Therefore, it is possible to provide a high performance cylindrical glass lens with a high degree of design freedom and high productivity.

また本発明により、球面または非球面を持つ金型および傾斜平面を持つ金型の形状において、鋭角となる角を排除できるため、金型の長寿命化およびそれに伴う斜面付円柱ガラスレンズのコストダウンを実現できる。   In addition, according to the present invention, it is possible to eliminate acute angles in the shape of a mold having a spherical surface or an aspherical surface and a mold having an inclined plane, thereby extending the life of the mold and concomitantly reducing the cost of a cylindrical glass lens with a slope. Can be realized.

本発明により得られる斜面付円柱ガラスレンズとは、ガラスレンズを構成する入射側および出射側の２表面のうち、一方の表面が球面または非球面形状を有し、他方の表面がこの球面または非球面の中心軸である光軸に対して垂直ではなく、所定の角度で傾斜した傾斜平面で構成されるガラスレンズを意味する。このガラスレンズ材料は、紫外光から赤外光までのうちいずれかの波長の光を透過させるものであればよい。   The cylindrical glass lens with a slope obtained by the present invention is one of two surfaces on the incident side and the emission side constituting the glass lens, and one surface has a spherical or aspherical shape, and the other surface has this spherical or non-spherical shape. It means a glass lens composed of an inclined plane that is not perpendicular to the optical axis, which is the central axis of the spherical surface, but is inclined at a predetermined angle. The glass lens material may be any material that transmits light of any wavelength from ultraviolet light to infrared light.

このような斜面付円柱ガラスレンズを製作する場合２つの方法が一般的である。第１は、該ガラスレンズのそれぞれの面を切削、研削、研磨などの機械的加工による直接的な加工を行って製作する方法である。第２は、該ガラスレンズ面に相当する両方の形状の金型を製作し、この金型を向かい合わせに組合わせ、それぞれの金型により形成された閉鎖空間にガラスレンズとなる材料を注入または挿入して作成する、プレス成形による方法である。プレス成形法の場合、それぞれの材料に適した温度、圧力などの条件で一定時間保持し、その後冷却して金型内から取り出す。   When manufacturing such a cylindrical glass lens with a slope, two methods are common. The first is a method of manufacturing each surface of the glass lens by performing direct processing by mechanical processing such as cutting, grinding, and polishing. Secondly, molds having both shapes corresponding to the glass lens surface are manufactured, the molds are combined face to face, and a material that becomes a glass lens is injected into a closed space formed by each mold or It is a method by press molding that is created by insertion. In the case of the press molding method, it is held for a certain period of time under conditions such as temperature and pressure suitable for each material, then cooled and taken out from the mold.

本発明は、第２のプレス成形法によって前述の斜面付円柱ガラスレンズを製作するものであり、一方のガラスレンズ面の傾斜平面の角度が大きくても高精度な傾斜平面とすることができ、他方のガラスレンズ面も高精度な球面または非球面とすることができ、かつ、ガラスレンズ内部にクラックなどの欠陥や歪みの少ない光学的に高性能な斜面付円柱ガラスレンズを効率よく作製する方法を提供できる。   The present invention is to produce the aforementioned cylindrical glass lens with a slope by the second press molding method, can be a highly accurate inclined plane even if the angle of the inclined plane of one glass lens surface is large, The other glass lens surface can also be a highly accurate spherical surface or aspherical surface, and a method of efficiently producing an optically high performance inclined cylindrical glass lens with less defects such as cracks and distortion inside the glass lens Can provide.

本発明により得られる斜面付円柱ガラスレンズの一例を図１（（ａ）側面図、（ｂ）断面図）に示す。１は傾斜平面２を有する斜面付円柱ガラスレンズ、３は球面または非球面、４は球面または非球面３のガラスレンズの中心軸に相当する光軸である。５は、本発明におけるクラック対策のために傾斜平面２の一部に光軸４と垂直な面にほぼ平行となるように設けた面の領域で、斜面付円柱ガラスレンズ１を通る光束の有効径外の位置に設けられている。また６は、成形時の金型の欠けなどの破損を防ぎ、金型の耐用回数を向上させるための面取部で、これも斜面付円柱ガラスレンズ１を通る光束径の有効径外の位置に設けられている。ここで、光軸に垂直な平面と傾斜平面２とのなす傾斜角度をθとする。   An example of a cylindrical glass lens with a slope obtained by the present invention is shown in FIG. 1 ((a) side view, (b) sectional view). Reference numeral 1 denotes an inclined cylindrical glass lens having an inclined plane 2, 3 denotes a spherical surface or an aspheric surface, and 4 denotes an optical axis corresponding to the central axis of the spherical or aspherical surface 3 glass lens. Reference numeral 5 denotes an area of a surface which is provided on a part of the inclined plane 2 so as to be substantially parallel to a surface perpendicular to the optical axis 4 in order to prevent cracks in the present invention. It is provided at a position outside the diameter. Reference numeral 6 denotes a chamfered portion for preventing damage such as chipping of the mold during molding and improving the number of times the mold can be used. This is also a position outside the effective diameter of the light beam diameter passing through the cylindrical glass lens 1 with a bevel. Is provided. Here, the inclination angle between the plane perpendicular to the optical axis and the inclined plane 2 is defined as θ.

図２に、本発明における斜面付円柱ガラスレンズの成形金型構造の例を示す。１は斜面付円柱ガラスレンズ、７は傾斜平面側の金型であり、これはプレス成形時に傾斜平面を生成する傾斜金型平面８を有する。傾斜金型平面８の一部は、面の領域を生成する面の領域の金型面９（従来の傾斜金型平面１６にはない）が含まれている。１０は球面または非球面側の金型であり、プレス成形時に球面または非球面を生成する曲面金型面１１を有し、さらにその周辺部にはガラスレンズ１の面取部６を生成する面取部の金型面１２を有している。また、１３は傾斜付円柱ガラスレンズ１の側面部を生成するリング金型であり、１４は傾斜平面側の金型７と球面または非球面側の金型１０とを保持する胴型である。   In FIG. 2, the example of the shaping die structure of the cylindrical glass lens with a slope in this invention is shown. Reference numeral 1 denotes an inclined cylindrical glass lens, and 7 denotes a mold on the inclined plane side, which has an inclined mold plane 8 that generates an inclined plane during press molding. A part of the inclined mold plane 8 includes a mold surface 9 (not in the conventional inclined mold plane 16) of the surface area that generates the surface area. A spherical or aspherical mold 10 has a curved mold surface 11 that generates a spherical or aspherical surface during press molding, and a surface that generates a chamfered portion 6 of the glass lens 1 at the periphery thereof. It has a mold surface 12 of the catch. Reference numeral 13 denotes a ring mold for generating a side surface portion of the tilted cylindrical glass lens 1, and reference numeral 14 denotes a body mold for holding the mold 7 on the inclined plane side and the mold 10 on the spherical or aspherical side.

従来の技術において述べたように、クラック２０は傾斜付円柱ガラスレンズ１へのプレス力が光軸に対して傾斜することにより発生し、またその程度は傾斜付円柱ガラスレンズ１が受ける光軸４方向以外のプレス力成分の大きさによって決まる。また、クラックはガラスレンズの大きさ、材料物性、成形条件などによっても発生の確率や程度が異なる。従来の傾斜金型平面１６の傾斜角度θが小さいとき、一般的にはほぼ５°より小さいときはクラック発生の確率は小さいため、従来の方法による成形ガラスレンズでもクラック発生の頻度は多くなかった。   As described in the prior art, the crack 20 is generated when the pressing force applied to the inclined cylindrical glass lens 1 is inclined with respect to the optical axis, and the degree thereof is the optical axis 4 received by the inclined cylindrical glass lens 1. It depends on the magnitude of the pressing force component other than the direction. In addition, the probability and degree of occurrence of cracks vary depending on the size of the glass lens, material properties, molding conditions, and the like. When the inclination angle θ of the conventional inclined mold plane 16 is small, generally when the angle is less than about 5 °, the probability of cracking is small, so the frequency of occurrence of cracks was not high even in the molded glass lens by the conventional method. .

しかし、この傾斜角度θを５°より小さい角度に限定することは、材料物性、屈折率などに制限が生じるため、ガラスレンズ設計やガラスレンズ製作上で非常に大きな制約となっている。これに対して、面の領域の金型面９を持った本発明における金型においては、従来発生のクラック２０の付近ではまず面の領域の金型面９が傾斜付円柱ガラスレンズ１に接触する。このため、傾斜付円柱ガラスレンズ１が傾斜平面側の金型７より受けるプレス力の光軸４方向以外の成分の大きさは、従来の傾斜平面側の金型１７と比較して小さくなる。   However, limiting the inclination angle θ to an angle smaller than 5 ° is a great restriction in designing a glass lens and manufacturing a glass lens because of limitations on material properties and refractive index. On the other hand, in the mold according to the present invention having the mold surface 9 in the surface area, the mold surface 9 in the surface area first contacts the inclined cylindrical glass lens 1 in the vicinity of the crack 20 generated in the past. To do. For this reason, the magnitude | size of components other than the optical axis 4 direction of the press force which the cylindrical glass lens 1 with an inclination receives from the metal mold | die 7 of an inclined plane side becomes small compared with the metal mold | die 17 of the conventional inclined plane side.

したがって、クラック発生の確率は減少し、傾斜角度θを５°以上の角度とするのでガラスレンズ設計の自由度が向上するため、高性能ガラスレンズの成形を実現でき好ましい。また、傾斜平面側の金型７は従来の傾斜平面側の金型１７と異なり、鋭角となるエッジを有しないため、欠けおよび割れ発生の可能性も減少し、金型寿命が伸び、また生産性もあがる。   Therefore, the probability of occurrence of cracks is reduced, and since the inclination angle θ is set to 5 ° or more, the degree of freedom in designing the glass lens is improved. Further, unlike the conventional inclined plane side mold 17, the inclined plane side mold 7 does not have an acute edge, so the possibility of chipping and cracking is reduced, the mold life is extended, and the production is increased. Sex goes up.

「実施例１」
本実施例は、図２に示されている成形金型構造となるように金型を作成した。
表１に示した組成欄（単位：ｍｏｌ％）のプレス成形用ロッドのガラス材料のうち、例１の材料について、ロッド寸法欄に示したそれぞれの外径、長さの円柱を製作し、両端面は平面研磨面仕上げを行い、ロッドのガラス材料とした。このロッドのガラス材料の端面は、曲面化されていてもよいし、平面のままでもよい。 "Example 1"
In this example, the mold was prepared so as to have the molding mold structure shown in FIG.
Among the glass materials of the press forming rods in the composition column (unit: mol%) shown in Table 1, for the material of Example 1, the cylinders of the respective outer diameters and lengths shown in the rod dimension column were manufactured, and both ends The surface was finished with a flat polished surface to obtain a rod glass material. The end surface of the glass material of the rod may be curved or may be flat.

Figure 2009001483
Figure 2009001483

次に、４軸超精密加工機を用いて、非球面を持つ曲面金型面１１を所定よりも深くダイヤモンド砥石にて研削加工し、その後欠け防止のため、曲面金型面の周縁領域に研削加工を行いガラスレンズに面取部が生成できるよう面取部の金型面（平面部）１２を設けて、所定の金型面および平面部を有する非球面側の金型１０とした。次に、上記の４軸超精密加工機を用いて、傾斜平面側の金型７の傾斜平面８を研削加工により形成し、その後に金型の欠け防止およびガラスレンズのクラック防止のため、光軸４に対し垂直な平面となるよう金型の傾斜平面８の周縁の一部を加工し面の領域の金型面９を形成した。   Next, a curved mold surface 11 having an aspherical surface is ground with a diamond grindstone deeper than a predetermined depth using a 4-axis ultra-precision machine, and then ground to the peripheral area of the curved mold surface to prevent chipping. A mold surface (planar portion) 12 of the chamfered portion is provided so that a chamfered portion can be generated on the glass lens by processing, thereby obtaining an aspherical surface mold 10 having a predetermined mold surface and a planar portion. Next, the inclined plane 8 of the mold 7 on the inclined plane side is formed by grinding using the above-described four-axis ultra-precision processing machine, and thereafter, for preventing chipping of the mold and cracking of the glass lens, light A part of the periphery of the inclined plane 8 of the mold was processed so as to be a plane perpendicular to the axis 4 to form a mold surface 9 in the surface area.

非球面側の金型１０にプレス時のガラスレンズ径方向のリング金型１３を取りつけ、リング金型１３中にロッドのガラス材料を投入し、最後に傾斜平面側の金型７をリング金型１３上部に取付け、ロッドのガラス材料をガラスレンズ形状の閉鎖空間に配置した。その後、ロッドのガラス材料を所定の温度に保持して傾斜平面側の金型７を光軸４方向に動かすことによりロッドのガラス材料に荷重を付加し、ガラスレンズ形状に変形させ、その後徐冷し所定形状の斜面付円柱ガラスレンズを得た。   A ring mold 13 in the radial direction of the glass lens at the time of pressing is attached to the mold 10 on the aspheric surface side, a rod glass material is put into the ring mold 13, and finally the mold 7 on the inclined plane side is attached to the ring mold. The glass material of the rod was placed in a closed space in the shape of a glass lens. Thereafter, the rod glass material is held at a predetermined temperature, and the inclined plane side mold 7 is moved in the direction of the optical axis 4 to apply a load to the rod glass material, which is then deformed into a glass lens shape, and then gradually cooled. A cylindrical glass lens with a slope having a predetermined shape was obtained.

表１中の例２および例３のロッドのガラス材料についても、本実施例１と同様に成形金型内で、斜面付円柱ガラスレンズに加工され、これら３種の斜面付円柱ガラスレンズはクラックのない良好なものであり、また傾斜平面側の金型７の傾斜平面８部に欠けが発生しなかった。   The glass materials of the rods of Example 2 and Example 3 in Table 1 were also processed into inclined cylindrical glass lenses in the molding die in the same manner as in Example 1, and these three types of inclined cylindrical glass lenses were cracked. No chipping occurred in the inclined plane 8 part of the mold 7 on the inclined plane side.

「実施例２」
本実施例は、図２に示されている成形金型構造を参考に説明する。
表１に示した組成欄（単位：ｍｏｌ％）のプレス成形用ロッドのガラス材料のうち、例４の材料について、ロッド寸法欄に示したそれぞれの外径、長さの円柱を製作し、両端面は平面研磨面仕上げを行い、ロッドのガラス材料とした。 "Example 2"
The present embodiment will be described with reference to the molding die structure shown in FIG.
Of the glass materials of the press forming rods in the composition column (unit: mol%) shown in Table 1, cylinders of the respective outer diameters and lengths shown in the rod dimension column were manufactured for the material of Example 4, and both ends The surface was finished with a flat polished surface to obtain a rod glass material.

次に、４軸超精密加工機を用いて、球面を持つ曲面金型面１１をダイヤモンド砥石にて研削加工し、所定の金型面有する球面側の金型１０とした。次に、上記の４軸超精密加工機を用いて、傾斜平面側の金型７の傾斜平面８を研削加工により形成し、その後に金型の欠け防止およびガラスレンズのクラック防止のため、光軸４に対し垂直な平面となるよう金型の傾斜平面８の周縁の一部を加工し面の領域の金型面９を形成した。ここで、傾斜角度θを６°とした。   Next, a curved mold surface 11 having a spherical surface was ground with a diamond grindstone using a 4-axis ultra-precision processing machine to obtain a spherical mold 10 having a predetermined mold surface. Next, the inclined plane 8 of the mold 7 on the inclined plane side is formed by grinding using the above-described four-axis ultra-precision processing machine, and thereafter, for preventing chipping of the mold and cracking of the glass lens, light A part of the periphery of the inclined plane 8 of the mold was processed so as to be a plane perpendicular to the axis 4 to form a mold surface 9 in the surface area. Here, the inclination angle θ was set to 6 °.

実施例１と同様に、球面側の金型１０にプレス時のガラスレンズ径方向のリング金型１３を取り付け、リング金型中に上記のロッドのガラス材料を投入し、最後に傾斜平面側の金型７をリング金型上部に取り付け、ロッドのガラス材料をガラスレンズ形状の閉鎖空間に配置した。その後、ロッドのガラス材料を所定の温度に保持して傾斜平面側の金型７を光軸４方向に動かすことによりロッドのガラス材料に荷重を付加し、ガラスレンズ形状に変形させ、その後徐冷し所定形状の斜面付円柱ガラスレンズを得た。   In the same manner as in Example 1, the ring mold 13 in the radial direction of the glass lens at the time of pressing is attached to the spherical mold 10, and the glass material of the rod is put into the ring mold. The mold 7 was attached to the upper part of the ring mold, and the glass material of the rod was placed in a glass lens-shaped closed space. Thereafter, the rod glass material is maintained at a predetermined temperature, and the die 7 on the inclined plane side is moved in the direction of the optical axis 4 to apply a load to the glass material of the rod, deform it into a glass lens shape, and then slowly cool it. A cylindrical glass lens with a slope having a predetermined shape was obtained.

表１中の例５および例６のロッドのガラス材料についても、本実施例１と同様に成形金型内で、斜面付円柱ガラスレンズに加工され、これら３種の斜面付円柱ガラスレンズはクラックのない良好なものであり、また傾斜平面側の金型７の傾斜平面８部に欠けが発生しなかった。   The glass materials of the rods of Example 5 and Example 6 in Table 1 were also processed into inclined cylindrical glass lenses in the molding die in the same manner as in Example 1, and these three types of inclined cylindrical glass lenses were cracked. No chipping occurred in the inclined plane 8 part of the mold 7 on the inclined plane side.

本発明により、傾斜平面を大きくした斜面付円柱ガラスレンズのプレス成形を可能にし、かつ、斜面付円柱ガラスレンズの傾斜平面側の金型や精密な球面または非球面側の金型の耐久性を増加することにより、傾斜平面を有する高生産性・高性能なガラスレンズが利用可能となる。   According to the present invention, it is possible to press-mold a sloped cylindrical glass lens with a large inclined plane, and to improve the durability of a sloped cylindrical glass lens and a precision spherical or aspherical die of a sloped cylindrical glass lens. By increasing, a highly productive and high performance glass lens having an inclined plane can be used.

本発明の斜面付円柱ガラスレンズの一例を示す図で、（ａ）側面図、（ｂ）断面図。It is a figure which shows an example of the cylindrical glass lens with a slope of this invention, (a) Side view, (b) Sectional drawing. 本発明の傾斜付円柱ガラスレンズの成形金型構造の例を示す断面図。Sectional drawing which shows the example of the shaping die structure of the cylindrical glass lens with an inclination of this invention. 従来の傾斜付円柱ガラスレンズの成形金型構造の例を示す断面図。Sectional drawing which shows the example of the shaping die structure of the conventional cylindrical glass lens with an inclination.

符号の説明Explanation of symbols

１：傾斜付円柱ガラスレンズ
２：傾斜平面
３：球面または非球面
４：光軸
５：面の領域
６：面取部
７：傾斜平面側の金型
８：傾斜金型平面
９：面の領域の金型面
１０：球面または非球面側の金型
１１：曲面金型面
１２：面取部の金型面
１３：リング金型
１４：胴型
１５：従来の傾斜付円柱ガラスレンズ
１６：傾斜金型平面
２０：クラック 1: Inclined cylindrical glass lens 2: Inclined plane 3: Spherical surface or aspherical surface 4: Optical axis 5: Surface area 6: Chamfer 7: Die 8 on inclined plane side: Inclined mold plane 9: Area of surface Mold surface 10: Spherical or aspherical surface mold 11: Curved mold surface 12: Chamfer mold surface 13: Ring mold 14: Body mold 15: Conventional inclined cylindrical glass lens 16: Inclined Mold plane 20: crack

Claims (3)

ガラスレンズを構成する光の入射側および出射側の２表面のうち、一方の表面の形状が球面または非球面であり、他方の表面の形状が、光軸に対して垂直な面から傾いている傾斜平面である斜面付円柱ガラスレンズを成形金型にガラス材料を充填してプレス成形する斜面付円柱ガラスレンズの製造方法であって、
前記成形金型は、傾斜平面側の金型と、球面または非球面側の金型と、前記斜面付円柱ガラスレンズの側面部を形成するリング金型と、前記傾斜平面側の金型と前記球面または非球面側の金型とを保持する胴型とで構成され、前記傾斜平面側の金型には、傾斜平面の一部に光軸と垂直な面にほぼ平行となるように面領域を設け、かつ前記面の領域が斜面付円柱ガラスレンズを通る光束の有効径以外の位置に設けられていることを特徴とする斜面付円柱ガラスレンズの製造方法。 Of the two surfaces on the light incident side and light exit side constituting the glass lens, the shape of one surface is spherical or aspherical, and the shape of the other surface is tilted from a plane perpendicular to the optical axis. A method of manufacturing a cylindrical glass lens with a slope, in which a cylindrical glass lens with a slope that is an inclined plane is filled with a glass material in a molding die and press-molded,
The molding die includes a mold on the inclined plane side, a mold on the spherical or aspherical side, a ring mold that forms a side surface portion of the inclined cylindrical glass lens, the mold on the inclined plane side, and the mold A cylindrical mold that holds a spherical or aspherical mold, and the mold on the inclined plane side has a surface region so that a part of the inclined plane is substantially parallel to a plane perpendicular to the optical axis. And the region of the surface is provided at a position other than the effective diameter of the light beam passing through the inclined cylindrical glass lens. 前記傾斜平面と前記垂直な面とのなす角度が５°以上である請求項１記載の斜面付円柱ガラスレンズの製造方法。   The manufacturing method of the cylindrical glass lens with a slope according to claim 1, wherein an angle formed by the inclined plane and the vertical surface is 5 ° or more. 前記傾斜平面側の金型の面領域を研削加工で形成する請求項１または２記載の斜面付円柱ガラスレンズの製造方法。   The manufacturing method of the cylindrical glass lens with a slope of Claim 1 or 2 which forms the surface area | region of the metal mold | die of the said inclination plane side by grinding.
JP2008173479A 2008-07-02 2008-07-02 Method of manufacturing cylindrical glass lens with inclined surface Withdrawn JP2009001483A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD837859S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837860S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837857S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837858S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD837859S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837860S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837857S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens
USD837858S1 (en) 2017-01-25 2019-01-08 Alps Electric Co., Ltd. Lens

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