JP3153827B2 - Optical element molding die - Google Patents
Optical element molding dieInfo
- Publication number
- JP3153827B2 JP3153827B2 JP03441992A JP3441992A JP3153827B2 JP 3153827 B2 JP3153827 B2 JP 3153827B2 JP 03441992 A JP03441992 A JP 03441992A JP 3441992 A JP3441992 A JP 3441992A JP 3153827 B2 JP3153827 B2 JP 3153827B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- optical
- mold
- optical function
- optical element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/46—Lenses, e.g. bi-convex
- C03B2215/48—Convex-concave
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/76—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガラスレンズ等の光学
素子成形用型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding an optical element such as a glass lens.
【０００２】[0002]
【従来の技術】従来、カメラ、顕微鏡等の光学機器に用
いられるガラスレンズ等の光学素子を型により成形する
場合、型とプリフォームとの間に残留ガスが存在する
と、成形されたレンズ表面に残留ガスによるくぼみが生
じるので、この残留ガスを除去するため例えば、特開平
３−１３１５３７号公報に開示された発明では金型の成
形面にガスベンドを設け、ガスベンドを通じて残留ガス
を外部に排出する成形方法が行なわれていた。2. Description of the Related Art Conventionally, when an optical element such as a glass lens used for an optical device such as a camera or a microscope is molded by a mold, if a residual gas is present between the mold and the preform, the molded lens surface is removed. In order to remove the residual gas, for example, in the invention disclosed in Japanese Patent Application Laid-Open No. 3-31537, a gas bend is provided on the molding surface of the mold, and the residual gas is discharged to the outside through the gas bend. The way had been done.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
光学素子成形用型では、型の光学機能面にガスベンドを
設けているため、押圧成形の際に加熱軟化したガラスが
ガスベンドに入り込み光学素子の光学機能面に小突起が
生じていた。この小突起はカメラ、顕微鏡等では外観上
不都合で、存在してはならないものである。However, in the conventional mold for molding an optical element, since a gas bend is provided on the optical function surface of the mold, the glass softened by heating during the press molding enters the gas bend and the optical element of the optical element. Small projections were formed on the functional surface. These small projections are inconvenient in appearance in cameras, microscopes, and the like, and should not be present.
【０００４】よって本発明は、前記従来の問題点に鑑み
て開発されたものであり、型とプリフォームとの間にガ
スが残留しない成形用型の提供を目的とする。Accordingly, the present invention has been developed in view of the above-mentioned conventional problems, and has as its object to provide a molding die in which no gas remains between the die and the preform.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
本発明は、第１面が凸面で、第２面が平面あるいは凹面
の光学素子を成形する際の、成形面に前記光学素子の第
１面を成形する凹面の光学機能面を有する一方の型と、
成形面に前記光学素子の第２面を形成する平面又は凸面
の光学機能面を有する他方の型から成る一対の光学素子
成形用型において、前記凹面の光学機能面を有する一方
の型の非光学機能面の外径が、平面あるいは凸面の光学
機能面を有する他方の型の非光学機能面を含む成形面の
外径より大きく、かつ当該非光学機能面の外周部分の軸
方向の高さが凹面の光学機能面の外周部分より高いこと
を特徴とするものである。In order to achieve the above object, the present invention provides a method for forming an optical element having a convex surface on a first surface and a flat or concave surface on a second surface. One mold having a concave optical function surface for molding one surface,
In a pair of optical element molding dies comprising the other mold having a flat or convex optical functional surface forming the second surface of the optical element on the molding surface, one of the molds having the concave optical functional surface is non-optical. The outer diameter of the functional surface is larger than the outer diameter of the molding surface including the non-optical functional surface of the other mold having a flat or convex optical functional surface, and the axial height of the outer peripheral portion of the non-optical functional surface is It is higher than the outer peripheral portion of the concave optical function surface.
【０００６】[0006]
【作用】本発明の前記構成の型により、両面が平面で外
径が凹面の光学機能面を有する側の型（例えば上型）の
外径より大きい径のプリフォームを用いて成形する際、
加熱軟化されたプリフォームは上型の外径部に軸方向に
突設された環状突出部と平面又は凸面の光学機能面を有
する側の型（例えば下型）との間で押圧されてプリフォ
ームの中央部が凸球面状に変形させられる。According to the above-mentioned mold of the present invention, when molding using a preform having a diameter larger than the outer diameter of the mold (for example, upper mold) on the side having a flat optical function surface with both surfaces being flat and having a concave outer diameter,
The heat-softened preform is pressed between an annular protrusion protruding in the outer diameter portion of the upper mold in the axial direction and a mold having a flat or convex optical function surface (for example, a lower mold). The center of the reform is deformed into a convex spherical shape.
【０００７】さらに、押圧が進行すると、プリフォーム
の凸球面状の中心部が上型の凹面の型面の中心部から接
触し始めることにより成形が行なわれるので、凹面の型
面とプリフォームとの間にはガスは残存しない。Further, as the pressing proceeds, the convex spherical center portion of the preform starts to contact from the center portion of the concave mold surface of the upper mold, whereby the molding is performed. No gas remains between them.
【０００８】[0008]
【実施例１】図１は本発明の実施例１を示し、上型は凹
面の光学機能面１ａを有し、光学機能面１ａの外周部に
は非光学機能面４が連設され、更に非光学機能面４の外
周部には、内径側に勾配部５ｂを設けた環状突出部５が
軸方向に突設されている。Embodiment 1 FIG. 1 shows Embodiment 1 of the present invention. The upper mold has a concave optical function surface 1a, and a non-optical function surface 4 is continuously provided on the outer periphery of the optical function surface 1a. On the outer peripheral portion of the non-optical function surface 4, an annular projecting portion 5 provided with a slope portion 5b on the inner diameter side is protruded in the axial direction.
【０００９】一方、下型２は平面の光学機能面２ａを有
し、光学機能面２ａの外周部分には、上型１の環状突出
部５の内径側勾配部５ｂに沿った勾配部２ｂが設けら
れ、下型２の最大外径は上型１の環状突出部５の内径よ
り小さくしてある。また、前記上下一対の型により押圧
成形するプリフォームは平板ガラス素材の両面を研磨加
工するとともに、その外径は上型１の外径より大きいも
のを使用する。On the other hand, the lower die 2 has a flat optical function surface 2a, and a gradient portion 2b along the inner diameter side gradient portion 5b of the annular protrusion 5 of the upper die 1 is formed on the outer peripheral portion of the optical function surface 2a. The maximum outer diameter of the lower mold 2 is smaller than the inner diameter of the annular protrusion 5 of the upper mold 1. The preform pressed and formed by the pair of upper and lower molds is formed by polishing both surfaces of a flat glass material and having an outer diameter larger than the outer diameter of the upper mold 1.
【００１０】また、環状突出部５の内径および突出高さ
は、図２に示すようにプリフォーム６の中央部を下型２
にて押圧した際にプリフォーム６の中央部が凸球面状６
ａにたわみ、その中心部の曲率が上型の光学機能面１ａ
の曲率より小さくなるように設定されている。Further, as shown in FIG. 2, the inner diameter and the protruding height of the annular protruding portion 5
The central part of the preform 6 is convex spherical 6
a, the curvature of the center of which is the upper optical function surface 1a
Is set to be smaller than the curvature of.
【００１１】しかして、上記構成の一対の型にてプリフ
ォーム６を形成するに際して、まず図２に示すようにプ
リフォーム６の中央部を下型２にて上方（上型側）に押
し上げることにより、プリフォーム６の外周近傍の面が
上型１の環状突出部５の端面５ａに当接し、更に下型２
の押圧が進むとプリフォーム６の中央部が凸球面状６ａ
にたわみ、凸球面状６ａの中心部が上型１の光学機能面
１ａの中心部に当接し始めて順次に成形動作が進行して
いくので、上型１の光学機能面１ａとプリフォーム６と
の間にはガスの残留がなくなる。When forming the preform 6 with the pair of dies having the above-described structure, first, as shown in FIG. 2, the center of the preform 6 is pushed up (upper die side) by the lower die 2. As a result, the surface near the outer periphery of the preform 6 comes into contact with the end face 5a of the annular projecting portion 5 of the upper mold 1, and the lower mold 2
As the pressing proceeds, the center of the preform 6 becomes convex spherical 6a.
Since the center of the convex spherical surface 6a starts to contact the center of the optical function surface 1a of the upper mold 1, the molding operation proceeds sequentially, so that the optical function surface 1a of the upper mold 1 and the preform 6 No gas remains between them.
【００１２】その結果、残留ガスが存在する場合にプリ
フォームの光学機能面に生じていたくぼみがなくなり、
型の形状を正確に転写することが可能となった。なお、
上型１と下型２のそれぞれの成形面の構成をそのままに
して、上下の型を逆転して成形を行なった場合も、前記
と同じ効果を奏した。As a result, the hollow formed on the optical function surface of the preform when the residual gas is present disappears,
It has become possible to transfer the shape of the mold accurately. In addition,
The same effect as described above was also achieved when the upper and lower dies were reversed while the respective molding surfaces of the upper and lower dies 1 and 2 were kept intact.
【００１３】[0013]
【実施例２】図３は本発明の実施例２を示し、上型の非
光学機能面４ａを曲面にするとともに、同面にガス抜き
穴７を設け、一方下型の光学機能面２ｃを凸面にすると
ともに非光学機能面を無くしたものでその他の構成につ
いては実施例１と同一符号を付してその説明を省略す
る。Embodiment 2 FIG. 3 shows Embodiment 2 of the present invention, in which the non-optical function surface 4a of the upper mold is curved and a gas vent hole 7 is provided on the same surface, while the optical function surface 2c of the lower mold is formed. The other configuration is the same as that of the first embodiment, and the description thereof is omitted.
【００１４】本発明の成形型においては、図４に示すよ
うに非光学機能面４ａを曲面にしてあるとともに同面に
ガス抜穴７を設けてあるので、プリフォーム６の変形が
容易であるとともにガスは抜穴７から外部に抜ける。In the mold of the present invention, as shown in FIG. 4, the non-optical function surface 4a is curved and the gas vent hole 7 is provided on the surface, so that the preform 6 can be easily deformed. At the same time, the gas escapes through the hole 7 to the outside.
【００１５】本実施例によれば、成形するレンズが厚肉
でも薄肉でも、プリフォーム６の変形及び流動が容易で
あり、下型２の接触によりプリフォーム６が冷却される
前に押圧が完了するので、特に、薄肉レンズの成形の際
に非常に有効であるとともに実施例１の作用効果を併せ
て発揮しうる。According to the present embodiment, regardless of whether the lens to be molded is thick or thin, deformation and flow of the preform 6 are easy, and pressing is completed before the preform 6 is cooled by contact with the lower mold 2. Therefore, it is very effective especially when molding a thin lens, and can also exert the effects of the first embodiment.
【００１６】[0016]
【発明の効果】本発明によれば、ガラス素材１とプリフ
ォームとの間にガスが残留しないため高い精度で光学機
能面を転写することが可能になるとともに、プリフォー
ムの流動を容易にすることも可能となる。According to the present invention, since no gas remains between the glass material 1 and the preform, it is possible to transfer the optically functional surface with high precision and to facilitate the flow of the preform. It is also possible.
【図１】本発明の実施例１を示す光学素子成形用型の断
面図である。FIG. 1 is a cross-sectional view of an optical element molding die showing Example 1 of the present invention.
【図２】同成形用型の作動を示す断面図である。FIG. 2 is a sectional view showing the operation of the molding die.
【図３】本発明の実施例２を示す光学素子成形用型の断
面図である。FIG. 3 is a sectional view of an optical element molding die according to a second embodiment of the present invention.
【図４】同成形用型の作動を示す断面図である。FIG. 4 is a sectional view showing the operation of the molding die.
１ 上型 １ａ 凹面の光学機能面 ２ 下型 ２ａ 平面の光学機能面 ２ｂ，５ｂ 勾配部 ２ｃ 凸面の光学機能面 ４，４ａ 非光学機能面 ５ 環状突出部 ５ａ 端面 ６ プリフォーム ７ ガス抜き穴 DESCRIPTION OF SYMBOLS 1 Upper mold 1a Concave optical function surface 2 Lower mold 2a Planar optical function surface 2b, 5b Slope portion 2c Convex optical function surface 4, 4a Non-optical function surface 5 Annular protrusion 5a End surface 6 Preform 7 Gas vent hole
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−10034（ＪＰ，Ａ) 特開 平２−267129（ＪＰ，Ａ) 特開 平３−131537（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 11/08 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-10034 (JP, A) JP-A-2-267129 (JP, A) JP-A-3-131537 (JP, A) (58) Field (Int.Cl. 7 , DB name) C03B 11/08
Claims (1)
凹面の光学素子を成形する際の、成形面に前記光学素子
の第１面を成形する凹面の光学機能面を有する一方の型
と、成形面に前記光学素子の第２面を形成する平面又は
凸面の光学機能面を有する他方の型から成る一対の光学
素子成形用型において、前記凹面の光学機能面を有する
一方の型の非光学機能面の外径が、平面あるいは凸面の
光学機能面を有する他方の型の非光学機能面を含む成形
面の外径より大きく、かつ当該非光学機能面の外周部分
の軸方向の高さが凹面の光学機能面の外周部分より高い
ことを特徴とする光学素子成形用型。When molding an optical element whose first surface is convex and whose second surface is flat or concave, one of the molding surfaces has a concave optical function surface for molding the first surface of the optical element. A mold and a pair of optical element molding dies comprising a flat or convex optical functional surface forming the second surface of the optical element on the molding surface, wherein one of the molds having the concave optical functional surface The outer diameter of the non-optical function surface is larger than the outer diameter of the molding surface including the non-optical function surface of the other mold having the flat or convex optical function surface, and the axial direction of the outer peripheral portion of the non-optical function surface. An optical element molding die, wherein the height is higher than the outer peripheral portion of the concave optical function surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03441992A JP3153827B2 (en) | 1992-01-24 | 1992-01-24 | Optical element molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03441992A JP3153827B2 (en) | 1992-01-24 | 1992-01-24 | Optical element molding die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05201735A JPH05201735A (en) | 1993-08-10 |
| JP3153827B2 true JP3153827B2 (en) | 2001-04-09 |
Family
ID=12413686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03441992A Expired - Fee Related JP3153827B2 (en) | 1992-01-24 | 1992-01-24 | Optical element molding die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3153827B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006265087A (en) | 2004-12-13 | 2006-10-05 | Ohara Inc | Preform for optical element |
-
1992
- 1992-01-24 JP JP03441992A patent/JP3153827B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05201735A (en) | 1993-08-10 |
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