JPH0694376B2 - Glass lens molding method - Google Patents
Glass lens molding methodInfo
- Publication number
- JPH0694376B2 JPH0694376B2 JP14073786A JP14073786A JPH0694376B2 JP H0694376 B2 JPH0694376 B2 JP H0694376B2 JP 14073786 A JP14073786 A JP 14073786A JP 14073786 A JP14073786 A JP 14073786A JP H0694376 B2 JPH0694376 B2 JP H0694376B2
- Authority
- JP
- Japan
- Prior art keywords
- glass material
- mold
- molding
- temperature
- molding method
- 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 - Lifetime
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
- C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、光学機器に使用されるガラスレンズを精密ガ
ラス成形法により形成するガラスレンズの成形方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass lens molding method for forming a glass lens used in optical equipment by a precision glass molding method.
従来の技術 近年光学レンズを研磨工程なしの一発成形により形成す
る試みが多くなされている。その成形法の問題点の一つ
として硝材の重量バラツキの吸収があり、その硝材の重
量バラツキを吸収するため金型あるいは胴型の一部を切
り欠いて成形する方法がある。（たとえば特開昭61-100
34号公報）。2. Description of the Related Art In recent years, many attempts have been made to form an optical lens by one-shot molding without a polishing step. One of the problems of the molding method is the absorption of the weight variation of the glass material, and there is a method of cutting out a part of the mold or the barrel die to absorb the weight variation of the glass material. (For example, JP-A-61-100
34 publication).
以下図面を参照しながら、上述した従来の成形方法を説
明する。The conventional molding method described above will be described below with reference to the drawings.
第３図は成形後の状態図である。１は上型、２は下型、
3a,3bは胴型、４は硝材、5,6はシリンダ、7,8はヒー
タ、Ｇは余分な硝材を逃すための隙間である。FIG. 3 is a state diagram after molding. 1 is the upper mold, 2 is the lower mold,
3a and 3b are barrel shapes, 4 is a glass material, 5 and 6 are cylinders, 7 and 8 are heaters, and G is a gap for releasing excess glass material.
上型１はシリンダ５に固定されており、胴型3aも上型１
とともに固定されている。下型２はシリンダ６に固定さ
れている。The upper die 1 is fixed to the cylinder 5, and the body die 3a is also the upper die 1
It is fixed with. The lower die 2 is fixed to the cylinder 6.
まず、下型２に胴型3bおよび硝材４をセットし、軟化点
近傍の温度まで加熱する。その後加圧することにより所
定の形状に成形されるものである。First, the barrel die 3b and the glass material 4 are set in the lower die 2 and heated to a temperature near the softening point. After that, it is molded into a predetermined shape by applying pressure.
発明が解決しようとする問題点 上記のような成形方法では上下型温度が同一温度に設定
されているため、にげ部Ｇに位置している部分の硝材４
の温度が上型１と硝材表面との接触部温度にほぼ等しい
温度にまで加熱されており、上型１が押圧された時、胴
型3bの上端に位置している部分の硝材４が先に変形し逃
げるため上型面と硝材表面間に充分な圧力が加わらない
ため、金型形状が正確に転写されず高精度な成形ができ
ないという問題を有していた。Problems to be Solved by the Invention In the above-mentioned molding method, since the upper and lower mold temperatures are set to the same temperature, the glass material 4 in the portion located in the bald portion G is
Is heated to a temperature almost equal to the contact temperature between the upper mold 1 and the surface of the glass material, and when the upper mold 1 is pressed, the glass material 4 located at the upper end of the body mold 3b comes first. Since it deforms and escapes into the mold, sufficient pressure is not applied between the upper mold surface and the surface of the glass material, so that the mold shape is not accurately transferred and high-precision molding cannot be performed.
問題点を解決するための手段 金型形状を精度よく転写させるポイントは硝材４の表面
と金型面間に充分な圧力を加えることが重要である。そ
のためには上型１の成形圧力を上型面に接触している硝
材表面でしっかりと受け止める必要がある。そのため本
発明は、上下型温度に差を設けつつ一面ずつ確実に成形
する手段を用いたものである。Means for Solving Problems It is important to apply a sufficient pressure between the surface of the glass material 4 and the surface of the mold in order to accurately transfer the shape of the mold. For that purpose, it is necessary to firmly receive the molding pressure of the upper mold 1 on the surface of the glass material which is in contact with the upper mold surface. Therefore, the present invention uses means for surely molding one surface at a time while providing a difference in upper and lower mold temperatures.
作用 本発明は上記した手段により、上型面と硝材表面に充分
な圧力を加えることができ、高精度な成形を可能にする
ものである。Action The present invention makes it possible to apply a sufficient pressure to the upper mold surface and the surface of the glass material by the means described above, thereby enabling highly accurate molding.
実施例 以下本発明の一実施例のガラスレンズの成形方法につい
て図面を参照しながら説明する。Examples Hereinafter, a method for molding a glass lens according to an example of the present invention will be described with reference to the drawings.
第１図は本発明による成形法の温度，硝材変形量，圧力
プロフィールを示し、第２図は本発明による成形時の状
態変化を示す。FIG. 1 shows the temperature, glass material deformation amount, and pressure profile of the molding method according to the present invention, and FIG. 2 shows the state change during molding according to the present invention.
第２図において１は上型、２は下型、3a,3bは胴型、４
は硝材、5,6はシリンダ、7,8はヒータ、Ｇは余分な硝材
４を逃すための隙間である。In FIG. 2, 1 is an upper die, 2 is a lower die, 3a and 3b are body dies, 4
Is a glass material, 5 and 6 are cylinders, 7 and 8 are heaters, and G is a gap for allowing the excess glass material 4 to escape.
まず、第１図のt1において第２図（ａ）のように硝材４
が下型２上にセットされ、上型１は硝材４の直近にまで
下降されている。（上型の位置を制御する部分は図示さ
れていない）この状態で上下型はともにヒータ7,8によ
り加熱されているが、下型面を先に転写させるため上型
温度は硝材４がほとんど変形しない温度T3（たとえばT8
点温度）に設定されており、T3に達するとキープされ
る。（第１図）下型温度は成形温度T2（硝材が充分に変
形しうる温度）に設定されており、T2に達すると同時に
プレス圧P1が加圧されシリンダ５とともに上型１は硝材
４を押圧する。（t2）そして、下型面が充分転写され得
る変形量だけ上型１が下降した所t3で一旦停止させる。
（第２図（ｂ）参照） 次にヒータ８をOFFし下型２を冷却させる。一方、上型
１は成形温度T2まで上昇させる。上型温度がT2に達しか
つ下型温度が硝材４がほとんど変形しない温度（たとえ
ばT8点温度）T3まで低下した時点（t4）で再び上型１を
下降させ、上型面を充分に転写する。この時、下型２の
温度は成形温度T2に対し充分低い温度まで低下している
ため胴型3bの上端部に位置する部分の硝材４が変形する
ことがなく、上型１の圧力が充分に硝材表面に加わり、
上型面にそって押し出された硝材４が胴型3aと胴型3b間
の隙間Ｇにはみだすように成形されることから金型形状
が正確に転写され、波面収差0.02〜0.03λという高精度
な成形を行うことが可能となる。（第２図（ｃ））。First, at t 1 in FIG. 1 , the glass material 4 as shown in FIG.
Is set on the lower mold 2, and the upper mold 1 is moved down to the vicinity of the glass material 4. (The part that controls the position of the upper mold is not shown.) In this state, the upper and lower molds are both heated by the heaters 7 and 8, but the upper mold temperature is almost the same as the glass material 4 because the lower mold surface is transferred first. Undeformed temperature T 3 (eg T 8
It is set to (point temperature) and is kept when T 3 is reached. (Fig. 1) The lower mold temperature is set to the molding temperature T 2 (the temperature at which the glass material can be sufficiently deformed), and at the same time when T 2 is reached, the press pressure P 1 is increased and the upper mold 1 becomes The glass material 4 is pressed. (T 2 ) Then, the upper mold 1 is temporarily stopped at a position t 3 where the upper mold 1 is lowered by a deformation amount capable of sufficiently transferring the lower mold surface.
(See FIG. 2B) Next, the heater 8 is turned off to cool the lower mold 2. On the other hand, the upper mold 1 is raised to the molding temperature T 2 . When the upper mold temperature reaches T 2 and the lower mold temperature decreases to a temperature at which the glass material 4 is hardly deformed (for example, T 8 point temperature) T 3 (t 4 ), the upper mold 1 is lowered again to move the upper mold surface. Transfer enough. At this time, since the temperature of the lower mold 2 has dropped to a temperature sufficiently lower than the molding temperature T 2 , the glass material 4 at the upper end of the barrel mold 3b is not deformed, and the pressure of the upper mold 1 is Adds enough to the surface of the glass material,
Since the glass material 4 extruded along the upper die surface is formed so as to protrude into the gap G between the body dies 3a and 3b, the die shape is accurately transferred, and the wavefront aberration is as high as 0.02 to 0.03λ. It is possible to perform various moldings. (FIG. 2 (c)).
発明の効果 本発明は前述の如く、単に上下型に温度差を設け、一面
毎に成形するという簡単な手段により波面収差0.02〜0.
03λという高精度な成形を可能にした。EFFECTS OF THE INVENTION As described above, the present invention simply provides a temperature difference between the upper and lower molds, and the wavefront aberration of 0.02 to 0.
It enables high-precision molding of 03λ.
第１図は本発明による成形法における上下型温度，手段
変形量，成形圧力のプロフィールを示す説明図、第２図
はその成形の過程を示す状態図、第３図は従来の成形方
法による成形後の状態図である。 １……上型、２……下型、3a,3b……胴型、４……硝
材、5,6……シリンダ、7,8……ヒータ。FIG. 1 is an explanatory view showing profiles of upper and lower mold temperatures, means deformation amount, and molding pressure in the molding method according to the present invention, FIG. 2 is a state diagram showing the molding process, and FIG. 3 is molding by a conventional molding method. FIG. 1 ... Upper mold, 2 ... Lower mold, 3a, 3b ... Body mold, 4 ... Glass material, 5,6 ... Cylinder, 7,8 ... Heater.
Claims (1)
ンズの成形法において、一方の面を成形完了後、他方の
面を成形することを特徴とするガラスレンズの成形方
法。1. A method of molding a glass lens using a pair of molding dies and a barrel mold, which comprises molding one surface and then molding the other surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14073786A JPH0694376B2 (en) | 1986-06-17 | 1986-06-17 | Glass lens molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14073786A JPH0694376B2 (en) | 1986-06-17 | 1986-06-17 | Glass lens molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62297227A JPS62297227A (en) | 1987-12-24 |
| JPH0694376B2 true JPH0694376B2 (en) | 1994-11-24 |
Family
ID=15275537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14073786A Expired - Lifetime JPH0694376B2 (en) | 1986-06-17 | 1986-06-17 | Glass lens molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0694376B2 (en) |
-
1986
- 1986-06-17 JP JP14073786A patent/JPH0694376B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62297227A (en) | 1987-12-24 |
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