JPH0361613B2 - - Google Patents
Info
- Publication number
- JPH0361613B2 JPH0361613B2 JP61141975A JP14197586A JPH0361613B2 JP H0361613 B2 JPH0361613 B2 JP H0361613B2 JP 61141975 A JP61141975 A JP 61141975A JP 14197586 A JP14197586 A JP 14197586A JP H0361613 B2 JPH0361613 B2 JP H0361613B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- nozzle
- glass
- lower molds
- 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
- C03B11/06—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
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/005—Pressing under special atmospheres, e.g. inert, reactive, vacuum, clean
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/65—Means for releasing gas trapped between glass and press die
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/66—Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (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、光学機械に使用されるガラスレンズ
の成形方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of molding a glass lens used in an optical machine.
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。この成形法
の一つとして素材を軟化点近傍の温度に加熱し、
押圧成形する方法がある。BACKGROUND ART In recent years, many attempts have been made to form optical lenses by one-shot molding without a polishing process. One of these molding methods involves heating the material to a temperature near its softening point.
There is a method of press molding.
（例えば、特開昭58−84134号公報）
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。(For example, Japanese Unexamined Patent Publication No. 58-84134) The above-mentioned conventional molding method will be explained below with reference to the drawings.
第４図は成形直前の状態図である。１は上型、
２は下型、１０は胴型、２０は空気抜き、４０は
ガラス素材である。 FIG. 4 is a state diagram immediately before molding. 1 is the upper mold,
2 is a lower mold, 10 is a body mold, 20 is an air vent, and 40 is a glass material.
まず、ガラス素材４０を適当な方法でガラスの
軟化点近傍まで加熱し、上下型１，２を用い押圧
成形する事によりガラスレンズを形成する。 First, a glass lens is formed by heating the glass material 40 by an appropriate method to near the softening point of glass and press-molding it using the upper and lower molds 1 and 2.
発明が解決しようとする問題点
上記の様な成形方法では金型１，２と胴型１０
により素材４０が閉じ込められた形となり、鉛や
アンチモン等の低融点金属を含有する素材を成形
すると、前記低融点金属が選択的に蒸発し、第３
図に示す様に金型面に付着物３が発生する。この
付着物３はしだいに堆積し、金型表面の面粗度を
悪くすると共に、その面粗度が成形されたレンズ
面にも転写されるためレンズ表面が凹凸になり、
その部分で光の乱反射が起り成形レンズの透過率
を低下させる原因になつていた。Problems to be solved by the invention In the above-described molding method, the molds 1 and 2 and the body mold 10
When a material containing a low melting point metal such as lead or antimony is molded, the low melting point metal is selectively evaporated and a third
As shown in the figure, deposits 3 are generated on the mold surface. This deposit 3 gradually accumulates and worsens the surface roughness of the mold surface, and the surface roughness is also transferred to the molded lens surface, making the lens surface uneven.
Diffuse reflection of light occurs in this area, causing a decrease in the transmittance of the molded lens.
問題点を解決するための手段
前記付着物３はガラス素材から選択的に蒸発し
た低融点金属が金型内に閉じ込められるために発
生しており、胴型１０を用いなければ周囲に飛散
するため金型面に前記付着物は発生しない。従つ
て、金型内に発生した蒸発物をなんらかの方法で
金型外へ排出すれば金型面の付着物は防止できる
と考えられる。本発明は胴型１０に設けた空気抜
き２０を利用しガラス素材４０から発生した蒸発
物を金型外へ強制的に排出しつつ成形するという
手段を用いたものである。Means for Solving the Problem The deposit 3 is generated because low melting point metal selectively evaporated from the glass material is trapped in the mold, and if the body mold 10 is not used, it will be scattered around. The above-mentioned deposits do not occur on the mold surface. Therefore, it is considered that deposits on the mold surface can be prevented by discharging the evaporated matter generated within the mold to the outside of the mold by some method. The present invention uses an air vent 20 provided in the body mold 10 to forcibly discharge vapors generated from the glass material 40 to the outside of the mold during molding.
作 用
本発明は、上記した手段により素材４０から発
生した蒸発物を金型外へ排出し、金型面への付着
防止を可能とした。Effects The present invention makes it possible to discharge the evaporated matter generated from the material 40 out of the mold by the above-described means, thereby preventing it from adhering to the mold surface.
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。EXAMPLE A method for molding a glass lens according to an example of the present invention will be described below with reference to the drawings.
第１図は本発明による成形直前の断面図であ
る。第２図は本発明による成形直後の断面図であ
る。１，２は上下金型、３，４は空気を逃すため
の切り欠き部、１０は胴型、２０は空気抜き、３
０は空気抜き２０に挿入されたノズル、４０はガ
ラス素材である。 FIG. 1 is a sectional view immediately before molding according to the present invention. FIG. 2 is a sectional view immediately after molding according to the present invention. 1 and 2 are upper and lower molds, 3 and 4 are notches for releasing air, 10 is a body mold, 20 is an air vent, 3
0 is a nozzle inserted into the air vent 20, and 40 is a glass material.
さて、第１図において、ノズル３０をポンプ
（図示せず）で吸引すると金型外の雰囲気ガスが
空気抜き２０を通じ(a)から流入し、金型内部のガ
スは(b)から排出され雰囲気ガスが循環される。こ
の時の吸引量は、金型の内容積及び金型を加熱す
るヒータパワーとの関係で適当な流量に設定する
必要がある。即ち、吸引量が不十分であるとガラ
ス素材から選択的に蒸発した低融点金属が金型内
に残り、金型面に僅かながら前記低融点金属の付
着物が発生する。吸引量が多過ぎると金型内の雰
囲気ガスの循環によつてガラス素材の熱が多量に
奪われるため、素材温度が成形温度に達するまで
に時間を要することになる。本実施例では吸引量
を１リツトル／分とし、連続的に吸引しつつ金型
を周囲から加熱することにより、ガラス素材４０
を徐々に加熱する。ガラス素材４０がその組成中
に含有する低融点金属の蒸発温度に達すると素材
表面より蒸発を始めるが、ノズル３０から吸引さ
れているため内部ガスと共に金型外へ排出され
る。そしてガラス素材４０がさらに加熱され軟化
点近傍の温度に達すると上下方向から金型を押圧
し、第２図に示す様なガラスレンズ４０を形成す
る。この間もノズル３０から金型内の雰囲気ガス
は常時排出されている。その結果、金型表面に全
く付着物が発生せず、成形レンズ４０には金型の
面形状が正確に転写され、波面収差0.02〜0.03λ、
透過率95％以上という高精度な成形を可能とし
た。尚、本実施例ではノズル３０から吸引する事
例を述べたが逆に吹き出す方法でも同様の効果が
得られる事は言うまでもない。 Now, in FIG. 1, when the nozzle 30 is sucked by a pump (not shown), the atmospheric gas outside the mold flows through the air vent 20 from (a), and the gas inside the mold is exhausted from (b). is circulated. The amount of suction at this time needs to be set to an appropriate flow rate in relation to the internal volume of the mold and the heater power for heating the mold. That is, if the amount of suction is insufficient, the low melting point metal selectively evaporated from the glass material remains in the mold, and a small amount of the low melting point metal adheres to the mold surface. If the amount of suction is too large, a large amount of heat will be removed from the glass material due to the circulation of atmospheric gas within the mold, and it will take time for the material temperature to reach the molding temperature. In this example, the suction amount is set to 1 liter/min, and the glass material 40 is heated by heating the mold from the surroundings while continuously suctioning.
Heat gradually. When the glass material 40 reaches the evaporation temperature of the low melting point metal contained in its composition, evaporation begins from the surface of the material, but since it is sucked through the nozzle 30, it is discharged out of the mold together with the internal gas. When the glass material 40 is further heated and reaches a temperature near its softening point, a mold is pressed from above and below to form a glass lens 40 as shown in FIG. During this time, the atmospheric gas inside the mold is constantly exhausted from the nozzle 30. As a result, no deposits are generated on the mold surface, the surface shape of the mold is accurately transferred to the molded lens 40, and the wavefront aberration is 0.02 to 0.03λ.
This enables high-precision molding with a transmittance of over 95%. In this embodiment, a case has been described in which suction is carried out from the nozzle 30, but it goes without saying that the same effect can be obtained by blowing out the liquid.
発明の効果
以上のように本発明を用いる事により金型表面
の付着物を防止すると共に、金型の面形状が正確
にガラス素材に転写され、透過率・波面収差共に
良好なガラスレンズを成形することが可能とな
る。Effects of the Invention As described above, by using the present invention, deposits on the mold surface can be prevented, the surface shape of the mold can be accurately transferred to the glass material, and a glass lens with good transmittance and wavefront aberration can be formed. It becomes possible to do so.
第１図は本発明による成形直前の状態図、第２
図はその成形直後の状態図、第３図は金型表面の
付着状況を示す説明図、第４図は従来の成形法の
成形直前の状態図である。
１……上型、２……下型、３，４……切り欠き
部、１０……胴型、２０……空気抜き、３０……
ノズル、４０……ガラス素材。
Figure 1 is a state diagram immediately before molding according to the present invention, Figure 2 is a state diagram immediately before molding according to the present invention;
The figure shows the state immediately after molding, FIG. 3 is an explanatory diagram showing the state of adhesion on the mold surface, and FIG. 4 shows the state immediately before molding using the conventional molding method. 1... Upper die, 2... Lower die, 3, 4... Notch, 10... Body die, 20... Air vent, 30...
Nozzle, 40...Glass material.
Claims (1)
と胴型からなる成形型内に素材を供給し、加熱昇
温後素材を直接上下金型で加圧成形して上下金型
の光学面を素材に転写するガラスレンズの成形方
法において、前記胴型に設けられたガス抜き穴に
ノズルを挿入し、前記ノズルを通して前記成形型
内部のガスを強制的に排出しつつ押圧成形するこ
とを特徴とするガラスレンズの成形方法。1. A material is supplied into a mold consisting of a pair of upper and lower molds and a body mold having a desired lens-shaped surface, and after heating and temperature rise, the material is directly pressure-molded with the upper and lower molds to form the optical surface of the upper and lower molds. The method for molding a glass lens to be transferred onto a material is characterized in that a nozzle is inserted into a gas vent hole provided in the body mold, and press molding is performed while forcibly exhausting gas inside the mold through the nozzle. How to mold glass lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141975A JPS62297224A (en) | 1986-06-18 | 1986-06-18 | Forming of glass lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61141975A JPS62297224A (en) | 1986-06-18 | 1986-06-18 | Forming of glass lens |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62302393A Division JPS63159229A (en) | 1987-11-30 | 1987-11-30 | Glass lens press molding mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62297224A JPS62297224A (en) | 1987-12-24 |
| JPH0361613B2 true JPH0361613B2 (en) | 1991-09-20 |
Family
ID=15304473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61141975A Granted JPS62297224A (en) | 1986-06-18 | 1986-06-18 | Forming of glass lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62297224A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01226744A (en) * | 1988-03-04 | 1989-09-11 | Konica Corp | Formation mold for glass optical element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59195541A (en) * | 1983-04-16 | 1984-11-06 | Hitachi Ltd | Glass lens manufacturing method and device |
| JPS60118643A (en) * | 1983-11-25 | 1985-06-26 | Fuji Photo Optical Co Ltd | Method for forming high precision glass lens |
-
1986
- 1986-06-18 JP JP61141975A patent/JPS62297224A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62297224A (en) | 1987-12-24 |
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