JPH0360780B2 - - Google Patents
Info
- Publication number
- JPH0360780B2 JPH0360780B2 JP30239387A JP30239387A JPH0360780B2 JP H0360780 B2 JPH0360780 B2 JP H0360780B2 JP 30239387 A JP30239387 A JP 30239387A JP 30239387 A JP30239387 A JP 30239387A JP H0360780 B2 JPH0360780 B2 JP H0360780B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molding
- lens
- gas
- present
- 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
Links
- 238000000465 moulding Methods 0.000 claims description 31
- 239000011521 glass Substances 0.000 claims description 5
- 239000012778 molding material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
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
- C03B2215/65—Means for releasing gas trapped between glass and press die
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Eyeglasses (AREA)
- Moulds For Moulding Plastics Or The Like (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レンズの成形
を行うガラスレンズ押圧成形用金型に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mold for press molding glass lenses for molding lenses used in optical equipment.
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（たとえば特開昭58−
84134号公報）。BACKGROUND ART In recent years, many attempts have been made to form optical lenses by one-shot molding without a polishing process. One of the forming methods is to heat the material to a temperature near its softening point,
There is a method of press molding (for example, JP-A-58-
Publication No. 84134).
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 mentioned above will be explained below with reference to the drawings.
第５図は成形直前の断面図である。１００は上
型、２００は下型、１１０は胴型、１３０は成形
素材である。 FIG. 5 is a sectional view immediately before molding. 100 is an upper mold, 200 is a lower mold, 110 is a body mold, and 130 is a molding material.
まず、還元性雰囲気の成形室内において適当な
方法で成形素材１３０を金型とともに素材の軟化
点近傍まで加熱し、上下型１００，２００を用い
押圧成形することによりレンズを成形する。 First, in a molding chamber with a reducing atmosphere, the molding material 130 is heated together with a mold to near the softening point of the material, and the lens is molded by pressure molding using the upper and lower molds 100 and 200.
発明が解決しようとする問題点
上記のような成形金型の構造では上下金型１０
０，２００と胴型１１０により成形素材１３０が
閉じ込められた形となり、成形時に金型内のガス
が完全に排出されず金型面とレンズ面との間にガ
スが残り、高精度な成形ができない。また金型内
のガスが成形室内の還元性雰囲気と置換されない
ため金型の内面が酸化されるといつた問題を有し
ていた。Problems to be Solved by the Invention In the structure of the molding die as described above, the upper and lower molds 10
The molding material 130 is trapped by the 0,200 and the body mold 110, and the gas in the mold is not completely exhausted during molding, leaving gas between the mold surface and the lens surface, making it impossible to form with high precision. Can not. Further, there was a problem in that the inner surface of the mold was oxidized because the gas in the mold was not replaced with the reducing atmosphere in the molding chamber.
問題点を解決するための手段
本発明は胴型の肉厚方向に貫通するガス抜き穴
を設けた構成により解決するものである。Means for Solving the Problems The present invention solves the problems by providing a gas vent hole penetrating the barrel mold in the thickness direction.
作 用
本発明は、上記した手段により金型内のガスを
成形室内の還元性雰囲気と容易に置換することが
できると同時に、成形完了時には金型内のガスを
完全に排出することができ高精度なレンズ成形を
可能とするものである。Effect The present invention allows the gas in the mold to be easily replaced with the reducing atmosphere in the molding chamber by the above-described means, and at the same time, the gas in the mold can be completely exhausted when molding is completed. This enables precise lens molding.
実施例
以下本発明によるレンズの成形方法の一実施例
について図面を参照しながら説明する。Embodiment An embodiment of the lens molding method according to the present invention will be described below with reference to the drawings.
第１図ａ，ｂは本発明による成形胴型の構造を
示し、１０は胴型、２０は胴型１０の肉厚方法に
貫通するように設けたガス抜き穴で、本実施例で
は４箇所に設けた。その穴の位置は第４図に示す
ように成形完了時において切り欠き部３，４の範
囲内にあり、金型の転写面の外周部よりレンズ４
０側にはみださないことが重要である。第２図
ａ，ｂは本発明による金型の構造を示し、２は金
型、４は金型の転写面の外周部に設けた切り欠き
部である。第３図は前記胴型および金型を用いた
成形直前の断面図である。第４図は成形直後の断
面図である。１，２は上下金型、１０は胴型、３
０は成形素材、５０，６０は上下プレスヘツドで
ある。本成形は還元性雰囲気内で行い、成形素材
にはSFガラス素材を用いた。以下、順次成形の
過程を述べる。 1a and 1b show the structure of a molding body mold according to the present invention, 10 is a body mold, 20 is a gas vent hole provided so as to penetrate through the wall thickness of the body mold 10, and in this embodiment there are four holes. It was established in As shown in Fig. 4, the position of the hole is within the range of the notches 3 and 4 when molding is completed, and the lens 4 is located from the outer periphery of the transfer surface of the mold.
It is important not to overflow to the 0 side. FIGS. 2a and 2b show the structure of a mold according to the present invention, where 2 is a mold and 4 is a notch provided on the outer periphery of the transfer surface of the mold. FIG. 3 is a sectional view immediately before molding using the body mold and the metal mold. FIG. 4 is a sectional view immediately after molding. 1 and 2 are upper and lower molds, 10 is a body mold, 3
0 is a molding material, and 50 and 60 are upper and lower press heads. This molding was performed in a reducing atmosphere, and SF glass material was used as the molding material. The following is a step-by-step description of the molding process.
第３図のように、ヒーターを内蔵した上下プレ
スヘツド５０，６０間に金型をセツトし、成形素
材３０を成形可能な軟化点付近まで加熱する。そ
の後、プレスヘツド５０，６０により上下金型
１，２を加圧し成形素材を徐々に変形させること
によつて第４図に示すようなレンズ４０が形成さ
れる。その成形素材３０の変形過程において、金
型内のガスは切り欠き部３，４そしてガス抜き穴
２０を通じ金型の昇温時に対流により成形室内の
還元性雰囲気と置換されるとともに、成形完了時
には金型内のガスは完全に排出される。したがつ
て、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という高精度な成
形が可能となるとともに金型の酸化も十分実用可
能なレベルまで押えることができた。 As shown in FIG. 3, a mold is set between upper and lower press heads 50 and 60 each having a built-in heater, and the molding material 30 is heated to around the softening point at which it can be molded. Thereafter, the upper and lower molds 1 and 2 are pressurized by press heads 50 and 60 to gradually deform the molding material, thereby forming a lens 40 as shown in FIG. 4. During the deformation process of the molding material 30, the gas in the mold passes through the notches 3, 4 and the gas vent hole 20 and is replaced by the reducing atmosphere in the molding chamber by convection as the temperature of the mold rises, and upon completion of molding. The gas in the mold is completely exhausted. Therefore, the surface shape of the mold is accurately transferred to the molded lens 40, enabling highly accurate molding with a wavefront aberration of 0.02 to 0.03λ, and oxidation of the mold can be suppressed to a sufficiently practical level. did it.
発明の効果
以上のように、本発明は胴型にガス抜き穴を設
けるという構成により金型内のガスの流れを容易
にし、金型の面形状を正確にレンズ面に転写でき
るという効果を有するものである。Effects of the Invention As described above, the present invention has the effect that gas flow within the mold is facilitated by providing a gas vent hole in the body mold, and the surface shape of the mold can be accurately transferred to the lens surface. It is something.
第１図はａ，ｂは本発明による胴型の構造図、
第２図ａ，ｂは本発明による金型の構造図、第３
図は本発明による成形直前の断面図、第４図はそ
の成形直後の断面図、第５図は従来の成形法によ
る成形直前の断面図である。
１……上型、２……下型、３，４……切り欠き
部、１０……胴型、２０……ガス抜き穴、３０…
…成形素材、４０……レンズ、５０，６０……上
下プレスヘツド。
Figures 1a and 1b are structural diagrams of the trunk type according to the present invention;
Figures 2a and b are structural diagrams of the mold according to the present invention;
The figure is a cross-sectional view immediately before molding according to the present invention, FIG. 4 is a cross-sectional view immediately after molding, and FIG. 5 is a cross-sectional view immediately before molding according to the conventional molding method. 1... Upper die, 2... Lower die, 3, 4... Notch, 10... Body die, 20... Gas vent hole, 30...
...Molding material, 40... Lens, 50, 60... Upper and lower press heads.
Claims (1)
胴型により構成される金型構成において、胴型の
肉厚方向に貫通するガス抜き穴を設けたことを特
徴とするガラスレンズ押圧成形用金型。 ２ 少なくとも一方の金型の転写面の外周部に切
り欠き部を設けたことを特徴とする特許請求の範
囲第１項記載のガラスレンズ押圧成形用金型。[Scope of Claims] 1. A glass lens characterized in that, in a mold configuration composed of a pair of molds for press-molding a glass lens and a body mold, a gas vent hole is provided that penetrates the body mold in the thickness direction. Mold for lens pressure molding. 2. The mold for press-molding a glass lens according to claim 1, characterized in that a notch is provided on the outer periphery of the transfer surface of at least one of the molds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62302393A JPS63159229A (en) | 1987-11-30 | 1987-11-30 | Glass lens press molding mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62302393A JPS63159229A (en) | 1987-11-30 | 1987-11-30 | Glass lens press molding mold |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61141975A Division JPS62297224A (en) | 1986-06-18 | 1986-06-18 | Forming of glass lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63159229A JPS63159229A (en) | 1988-07-02 |
| JPH0360780B2 true JPH0360780B2 (en) | 1991-09-17 |
Family
ID=17908371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62302393A Granted JPS63159229A (en) | 1987-11-30 | 1987-11-30 | Glass lens press molding mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63159229A (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 |
-
1987
- 1987-11-30 JP JP62302393A patent/JPS63159229A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63159229A (en) | 1988-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |