JPS62297230A - Mold for lens - Google Patents
Mold for lensInfo
- Publication number
- JPS62297230A JPS62297230A JP14074586A JP14074586A JPS62297230A JP S62297230 A JPS62297230 A JP S62297230A JP 14074586 A JP14074586 A JP 14074586A JP 14074586 A JP14074586 A JP 14074586A JP S62297230 A JPS62297230 A JP S62297230A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- glass
- lens
- gas escape
- gas
- 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.)
- Pending
Links
- 238000009760 electrical discharge machining Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 29
- 238000000465 moulding Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000001419 dependent effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 27
- 239000000463 material Substances 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 238000007781 pre-processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007493 shaping 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)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
産業上の利用分野
本発明は研磨によらず、成形によりレンズを製造するた
めのレンズ用金型に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a lens mold for manufacturing lenses by molding rather than polishing.
従来の技術
レンズは主にガラス素材を研磨して形状を仕上げ、製造
されている。しかし、研磨では球面レンズは満足のでき
るものができるが、最近、特に、高性能化、レンズ枚数
の削減、コンパクト化の要求に応えるため、導入の必要
性を叫ばれている非球面レンズにおいては、研磨の技術
では、採算の合うものを製造することは難しい。Conventional technology lenses are manufactured primarily by polishing glass materials to give them a final shape. However, although spherical lenses can be made satisfactorily by polishing, recently there has been a strong demand for the introduction of aspherical lenses, especially in order to meet the demands for higher performance, reduction in the number of lenses, and downsizing. It is difficult to manufacture products that are profitable using polishing technology.
これに対し、プラスチック材料を使い、射出成形等によ
り、球面、非球面のレンズを成形する方法も盛んとなっ
てきている。しかし、プラスチック材料の屈折率と分散
の範囲が、ガラスに比べると狭いこと、耐熱、耐湿性に
おいて、ガラスに劣ること、などの理由により使える範
囲も限定されている。これらのことから、ガラスを研磨
でなく成形によって形状を仕上げてレンズとする技術が
重要な地位を占めていることがわかる。このような技術
としては、例えば特開昭５８−８４１３４号公報のよう
に所望の最終製品の形状に近似する形状を有するガラス
を加熱してレンズ形状、及び面粗度を得る方法がある。On the other hand, methods of molding spherical or aspherical lenses using plastic materials by injection molding or the like are also becoming popular. However, the range of plastic materials that can be used is limited because the range of refractive index and dispersion of plastic materials is narrower than that of glass, and that plastic materials are inferior to glass in terms of heat resistance and moisture resistance. From these facts, it can be seen that the technology of forming lenses by shaping glass, rather than polishing it, occupies an important position. As such a technique, for example, there is a method as disclosed in Japanese Patent Laid-Open No. 58-84134, in which a lens shape and surface roughness are obtained by heating glass having a shape that approximates the shape of a desired final product.
この方法であれば、レンズ性能的には金型の精度が十分
であれば、十分に満足のできるものが得られる。しかし
、成形によって凸状の表面を得ようとする場合において
は、第５図のようにガラス４の曲面が金型１，４のキャ
ビティの曲面より鋭くして、ガラスが先ず金型内中心に
接するような制限や、更にガラスの重量は厳密に制御さ
れなければならない制限が必要であったため、ガラスの
前加工のコスト高の原因となり量産上のネックとなって
いた。With this method, as long as the precision of the mold is sufficient, it is possible to obtain a lens that is completely satisfactory in terms of lens performance. However, when trying to obtain a convex surface by molding, the curved surface of the glass 4 is made sharper than the curved surface of the cavities of the molds 1 and 4, as shown in FIG. This required restrictions such as contact and strict control of the weight of the glass, which caused high costs for glass pre-processing and became a bottleneck in mass production.
発明が解決しようとする問題点
本発明の目的は、研磨工法によらず、成形によりレンズ
を製造するための金型に関するものであり、更に詳しく
言えば、成形によって凸状の表面を得ようとする場合に
おいて、ガラスが先ず金型の中心に接するような形状に
前加工を施す必要があったが、そのような前加工を不用
とすることにある。Problems to be Solved by the Invention The object of the present invention is to relate to a mold for manufacturing lenses by molding without using a polishing method, and more specifically, to obtain a convex surface by molding. In this case, it was necessary to perform pre-processing so that the glass would first contact the center of the mold, but the purpose is to eliminate the need for such pre-processing.
問題点を解決するための手段
つまり金型面の少な（とも１面が凹である金型面の中心
部にガス逃げ孔を少なくとも１個以上設けることにより
ガラスの形状に制限を加えることな（、成形時のガス逃
げを十分おこなえるようにした。A means to solve the problem is to provide at least one gas escape hole in the center of the mold surface (one side of which is concave) so as not to limit the shape of the glass. , to allow sufficient gas escape during molding.
作用
金型面の少な（とも１面が凹である金型面の中心部にガ
スの逃げ孔を少なくとも１個以上設けることにより、成
形中に金型とガラスの間にガスを閉じこめることなく成
形でき、金型の形状が正確に転写されることが可能とな
る。By providing at least one gas escape hole in the center of the mold surface with a small working mold surface (both sides are concave), it is possible to mold without trapping gas between the mold and the glass during molding. This makes it possible to accurately transfer the shape of the mold.
実施例
以下、本発明の一実施例について、図面を参照しながら
説明する。第１図は、本発明の一実施例のレンズ用金型
の構成を示す断面図である。第１図において１．２は１
対の金型を示し、この場合２面とも凹である。３はリン
グでレンズの２面の光軸を合わせたり、外径を規制する
役目をする。EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing the structure of a lens mold according to an embodiment of the present invention. In Figure 1, 1.2 is 1
A pair of molds is shown, in this case both sides are concave. 3 is a ring that serves to align the optical axes of the two surfaces of the lens and regulate the outer diameter.
７はキャビティでこの中にガラスが供給される。7 is a cavity into which glass is supplied.
５は、金型表面のガス逃げ孔で、６は、金型内部のガス
逃げ流路を示す。第３図は、金型１又は２の平面図であ
り、５の金型表面のガス逃げ孔が１個で金型の中央にあ
けられている例を示している。5 is a gas escape hole on the surface of the mold, and 6 is a gas escape channel inside the mold. FIG. 3 is a plan view of the mold 1 or 2, showing an example in which a single gas escape hole on the surface of the mold 5 is provided in the center of the mold.
以上のように構成された本実施例について以下にその作
用を第４図にもとづき説明する。第４図（ａｌの如く、
円柱状のガラス４がキャビティに供給された後、適切な
温度条件のもとて加圧力が与えられ、４のガラスが変形
をはじめたのが（ｂ）で示しである。ｆａ）のキャビテ
ィの空間にある空気や、ガラスから発生するガスは５の
金型表面のガス逃げ孔を経てさらに、６の金型内のガス
逃げ流路を通りスムーズに除去されていくことができる
。さらに変形を進めキャビティ内の空間にある空気や、
ガスをすべて追い出して成形を完全に行なった状態が（
Ｃ）で示しである。５の金型表面のガス逃げ孔は、キャ
ビティ内の空間にある空気やガスを追い出すが、高温下
で粘度が下がって流れやすくなったガラスがガス逃げ孔
からは流れ出ることがないように直径ｌＯ〜２０μｎで
あけである。すなわち２０μｎを越えるとガラスの種類
や成形温度によっても多少変化するが、ガラスが流れ出
る可能性がでてくるし、また１０μｎ未満であると、ガ
ス逃げ抵抗が高くなり、成形速度にも制限が加わること
になり望ましくない。第２図に第４図で示したような実
施例によって成形されたレンズ８を示している。The operation of this embodiment configured as described above will be explained below based on FIG. 4. Figure 4 (as in al.
After the cylindrical glass 4 was supplied to the cavity, pressure was applied under appropriate temperature conditions, and the glass 4 began to deform, as shown in (b). The air in the cavity space in fa) and the gas generated from the glass pass through the gas escape holes on the mold surface in step 5, and then pass through the gas escape channel in the mold in step 6 to be smoothly removed. can. As the deformation continues, the air in the space inside the cavity,
The state when all the gas has been expelled and molding has been completed is (
It is shown by C). The gas escape holes on the surface of the mold (No. 5) expel air and gas from the space inside the cavity, but the diameter of the holes is 10 to prevent the glass, whose viscosity decreases under high temperatures and becomes easier to flow, from flowing out from the gas escape holes. ~20 μn is sufficient. In other words, if it exceeds 20 μn, there is a possibility that the glass will flow out, although it varies somewhat depending on the type of glass and the molding temperature, and if it is less than 10 μn, the gas escape resistance will be high and the molding speed will be limited. becomes undesirable. FIG. 2 shows a lens 8 molded according to the embodiment shown in FIG.
（ｂ）はレンズ８の下側の面の中心部の拡大図である。(b) is an enlarged view of the center of the lower surface of the lens 8.
上述のように直径２０μｎまでのガス逃げ孔であれば、
ガス逃げ孔からガラスが流れ出ることはないが、図示の
ように非常にわずかではあるがとびでることも考えられ
る。この径ｄはもちろん２０μｎ以下である。このよう
な中心部での形状誤差は好ましいものではないが、２０
μｎ以下のものであるので、レンズ面に占める面積はわ
ずかとなり、性能上への悪影響はほとんどないと言える
。このガス逃げ孔は、流動抵抗を極力小さくすることが
望ましいが、そのため第１図にも図示の通り、金型表面
のガス逃げ孔５の長さは、金型強度が許す限り短かくし
、金型内部のガス逃げ流路６も可能な限り太く短かく、
流路の太さを二段にする。As mentioned above, if the gas escape hole is up to 20 μm in diameter,
Although the glass will not flow out from the gas escape hole, it is possible that the glass may pop out, albeit very slightly, as shown in the figure. This diameter d is, of course, 20 μn or less. Although such a shape error at the center is not desirable, 20
Since it is less than .mu.n, it occupies a small area on the lens surface and can be said to have almost no adverse effect on performance. It is desirable that the flow resistance of this gas escape hole be made as small as possible. Therefore, as shown in FIG. The gas escape channel 6 inside the mold is also as thick and short as possible.
The thickness of the channel is made into two stages.
ガラスの成形に用いられる金型母材は超硬合金などのよ
うな硬質の材料であり、微細加工は困難であるが、本実
施例のガス逃げ孔の加工も放電加工法により、パリもな
く精度のよい加工ができる。The mold base material used for glass molding is a hard material such as cemented carbide, and micromachining is difficult, but the gas escape holes in this example were machined using the electric discharge machining method, so there were no chips. Able to process with high precision.
発明の効果
以上の説明から明らかなように、本発明は、金型面の少
なくとも１面が凹である金型面の中心部にガスの逃げ孔
を少なくとも１個以上設けているので、ガラスの曲面が
金型のキャビティの曲面より鋭くシて、ガラスが先ず金
型内中心に接するような形状にガラスを前加工する必要
をなくし、単に円柱状のガラスからでも、ガス逃げを行
ないながら成形できるという優れた効果が得られる。Effects of the Invention As is clear from the above description, the present invention provides at least one gas escape hole in the center of the mold surface, at least one of which is concave. The curved surface is sharper than the curved surface of the mold cavity, eliminating the need for pre-processing the glass into a shape where the glass first contacts the center of the mold, and can be molded even from simply cylindrical glass while allowing gas to escape. This excellent effect can be obtained.
ガス逃げが十分に行なえることから、ガラスから加熱中
に出る種々のガスについても金型表面に付着することな
くキャビティの外へ逃がされるのでレンズの表面粗度の
向上、金型寿命の向上といった効果も得られる。Since sufficient gas escape is possible, various gases emitted from the glass during heating can escape from the cavity without adhering to the mold surface, resulting in improved lens surface roughness and mold life. Effects can also be obtained.
第１図は本発明の一実施例に係る金型の構成の断面図、
第２図（ａ） ｆｂｌは、本発明の一実施例に係るレン
ズの表面形状の説明図で、山）は（ａ）の丸で囲んだ部
分の拡大図、第３図は、金型の平面図、第４図（ａ）
（ｂ） （Ｃ）は、本発明の一実施例に係る成形工程図
、第５図は従来の金型の構成の断面図である。
■・・・・・・金型、２・・・・・・金型、３・・・・
・・リング、４・・・・・・ガラス、５・・・・・・金
型表面のガス逃げ孔、６・・・・・・金型内部のガス逃
げ孔、７・・・・・・キャビティ、８・・・・・・レン
ズ。
代理人の氏名 弁理士 中尾敏男 はか１名ｔ２−金型
４
６−金型内部のガス坂１デコｂ
７−−−午マビテイ
第２図
第 ３ 図
第５図
ｔFIG. 1 is a sectional view of the configuration of a mold according to an embodiment of the present invention;
Fig. 2 (a) fbl is an explanatory diagram of the surface shape of a lens according to an embodiment of the present invention, the crest) is an enlarged view of the circled part in (a), and Fig. 3 is an explanatory diagram of the surface shape of a lens according to an embodiment of the present invention. Plan view, Figure 4(a)
(b) (C) is a molding process diagram according to an embodiment of the present invention, and FIG. 5 is a sectional view of the configuration of a conventional mold. ■・・・Mold, 2...Mold, 3...
...Ring, 4...Glass, 5...Gas escape hole on the mold surface, 6...Gas escape hole inside the mold, 7... Cavity, 8... Lens. Name of agent: Patent attorney Toshio Nakao 1 person T2 - Mold 4 6 - Gas slope inside the mold 1 Deco b 7 - Mabitei Figure 2 Figure 3 Figure 5 T
Claims (4)
部にガスの逃げ孔を少なくとも１個以上設けたことを特
徴とするレンズ用金型。(1) A lens mold characterized in that at least one of the mold surfaces is concave and at least one gas escape hole is provided in the center of the mold surface.
ｎであることを特徴とする特許請求の範囲第（１）項に
記載のレンズ用金型。(2) The gas escape hole has a diameter of 10 to 20μ on the mold surface.
The lens mold according to claim (1), wherein the mold is n.
て行なうことを特徴とする特許請求の範囲第（１）項に
記載のレンズ用金型。(3) The lens mold according to claim (1), wherein gas escape holes are formed on the mold surface by electrical discharge machining.
内部では太く短かく、流路の太さを二段にしたことを特
徴とする特許請求の範囲第（１）項に記載のレンズ用金
型。(4) According to claim (1), the gas escape hole is narrow and short on the surface of the mold, and wide and short inside the mold, so that the thickness of the flow path is divided into two stages. Mold for the lens described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074586A JPS62297230A (en) | 1986-06-17 | 1986-06-17 | Mold for lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14074586A JPS62297230A (en) | 1986-06-17 | 1986-06-17 | Mold for lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62297230A true JPS62297230A (en) | 1987-12-24 |
Family
ID=15275737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14074586A Pending JPS62297230A (en) | 1986-06-17 | 1986-06-17 | Mold for lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62297230A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02160632A (en) * | 1988-12-13 | 1990-06-20 | Canon Inc | Mold for molding lens |
| JP2007106643A (en) * | 2005-10-14 | 2007-04-26 | Ohara Inc | Glass molding apparatus and glass molding method |
| CN103011561A (en) * | 2012-12-13 | 2013-04-03 | 常熟建华模具科技股份有限公司 | Die for manufacturing glassware |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071532A (en) * | 1983-09-22 | 1985-04-23 | Nippon Sheet Glass Co Ltd | Process for forming hollow glass article |
-
1986
- 1986-06-17 JP JP14074586A patent/JPS62297230A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071532A (en) * | 1983-09-22 | 1985-04-23 | Nippon Sheet Glass Co Ltd | Process for forming hollow glass article |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02160632A (en) * | 1988-12-13 | 1990-06-20 | Canon Inc | Mold for molding lens |
| JP2007106643A (en) * | 2005-10-14 | 2007-04-26 | Ohara Inc | Glass molding apparatus and glass molding method |
| CN103011561A (en) * | 2012-12-13 | 2013-04-03 | 常熟建华模具科技股份有限公司 | Die for manufacturing glassware |
| CN103011561B (en) * | 2012-12-13 | 2015-02-11 | 常熟建华模具科技股份有限公司 | Die for manufacturing glassware |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5346523A (en) | Method of molding chalcogenide glass lenses | |
| US5822134A (en) | Optical lens and mold for molding the same | |
| JPS62297230A (en) | Mold for lens | |
| EP1407866A1 (en) | Forming mold for contact lens, and method of manufacturing contact lens by using the forming mold | |
| JPH03218932A (en) | Lens forming mold | |
| JP3191447B2 (en) | Method of manufacturing resin-bonded aspheric lens | |
| JPH08337428A (en) | Glass lens forming mold | |
| JP2000095532A (en) | Press-formed optical element, its production, die for press-forming optical element and device for press- forming optical element | |
| JPH0414429Y2 (en) | ||
| JPH0339218A (en) | Mold for molding of plastic lens | |
| JP2621956B2 (en) | Optical element molding method | |
| JP2000053428A (en) | Production of optical element, its producing device and optical element | |
| JPH11171556A (en) | Glass gob for forming optical element and forming device and forming method therefor | |
| JP3753372B2 (en) | Manufacturing method of compound aspherical lens | |
| JP3618936B2 (en) | Optical element molding method | |
| JP3299785B2 (en) | Manufacturing method of optical glass lens | |
| JP3883634B2 (en) | Mold for press molding optical elements | |
| JPS61291424A (en) | Forming mold of glass lens and forming method | |
| JPH06127957A (en) | Mold for molding glass lens | |
| KR0125997Y1 (en) | A mould for lens | |
| JPH08208246A (en) | Glass press mold | |
| JPS60186801A (en) | Multiplex lens structure | |
| JPH08325023A (en) | Optical element forming die and optical element formed by using this optical element forming die | |
| JP3826060B2 (en) | Glass body forming method | |
| JPH0570155A (en) | Mold for glass lens molding |