JPH0798669B2 - Optical element molding method - Google Patents
Optical element molding methodInfo
- Publication number
- JPH0798669B2 JPH0798669B2 JP63321196A JP32119688A JPH0798669B2 JP H0798669 B2 JPH0798669 B2 JP H0798669B2 JP 63321196 A JP63321196 A JP 63321196A JP 32119688 A JP32119688 A JP 32119688A JP H0798669 B2 JPH0798669 B2 JP H0798669B2
- Authority
- JP
- Japan
- Prior art keywords
- optical element
- molding
- mold
- temperature
- optical
- 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
- 230000003287 optical effect Effects 0.000 title claims description 81
- 238000000465 moulding Methods 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 13
- 239000011521 glass Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 239000004696 Poly ether ether ketone Substances 0.000 description 12
- 229920002530 polyetherether ketone Polymers 0.000 description 12
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 10
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000005498 polishing 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
- C03B11/12—Cooling, heating, or insulating the plunger, the mould, or the glass-pressing machine; cooling or heating of the glass in the mould
-
- 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
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)
- Casting Or Compression Moulding Of 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，プリズム等の
高精度光学ガラス素子を超精密ガラス成形法により成形
する光学素子成形型と、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 an optical element molding die for molding a high-precision optical glass element such as a lens or prism used in an optical device by an ultra-precision glass molding method, and a molding method. It is a thing.
従来の技術 近年、高精度光学素子、特に非球面ガラスレンズ等は研
磨工程なしの一発成形により製造されている。成形法の
一つとして、ガラス素材を変形可能な温度、例えば、軟
化点近傍の温度まで加熱し、押圧成形、冷却等の手段を
用いて成形する方法がある。（例えば、特開昭61−2192
5号公報）この方法には、高精度な成形型が必要とされ
ている。2. Description of the Related Art In recent years, high-precision optical elements, particularly aspherical glass lenses and the like, are manufactured by one-shot molding without a polishing step. As one of the molding methods, there is a method of heating the glass material to a temperature at which it can be deformed, for example, a temperature near the softening point, and molding it by means such as press molding or cooling. (For example, JP-A-61-2192
(Gazette No. 5) This method requires a highly accurate molding die.
第６図は従来の光学素子成形型の構造を示すものであ
る。第６図において、63は胴型である。61は上型、62は
下型で胴型63内で摺動する。64は成形されたレンズであ
る。ガラス素材を型の中に供給し成形型61,62により押
圧成形する。FIG. 6 shows the structure of a conventional optical element molding die. In FIG. 6, 63 is a barrel type. 61 is an upper mold and 62 is a lower mold that slides in a barrel mold 63. 64 is a molded lens. The glass material is supplied into the mold and pressed by the molding dies 61 and 62.
発明が解決しようとする課題 しかしながら上記のような構成では、成形型及びガラス
素材を加熱し、ガラス素材が軟化点近傍まで昇温した後
加圧変形させ、光学素子の形状を保つよう圧力をかけな
がら徐冷しなければならない。前記手順により光学素子
の成形を行うと、成形型の温度調整は押圧型の低面部ま
たは胴型の側面部より行うため、光学素子に均等な温度
分布が成されず、個々の光学素子は歪が多く、所望の光
学的性能が得られにくいという問題点を有していた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, the mold and the glass material are heated, and the glass material is heated to a temperature near the softening point and then deformed under pressure, and pressure is applied to maintain the shape of the optical element. While it has to be slowly cooled. When the optical element is molded according to the procedure described above, the temperature of the molding die is adjusted from the lower surface portion of the pressing die or the side surface portion of the body die, so that an even temperature distribution is not formed in the optical element and the individual optical elements are distorted. However, there is a problem in that it is difficult to obtain desired optical performance.
本発明は上記問題点に鑑み、胴型と押圧型との間の空間
部に、温度調整された流体を流し込むことで、光学素子
の光学的性能が決められる冷却加圧時に、光学素子素材
に均等な温度分布をもたせ成形する光学素子成形方法、
並びに前記光学素子成形型を提供するものである 課題を解決するための手段 上記課題を解決するために本発明の光学素子成形型は、
胴型または押圧型に流体の供給口を具備し、光学素子の
温度分布を均一にするための流体を流し込む装置を具備
している。In view of the above problems, the present invention, in the space between the barrel mold and the pressing mold, by pouring a temperature-controlled fluid, at the time of cooling and pressurizing the optical performance of the optical element is determined, in the optical element material An optical element molding method for molding with an even temperature distribution,
Also, there is provided the optical element molding die. Means for Solving the Problems In order to solve the above problems, the optical element molding die of the present invention is
The body type or the pressing type is provided with a fluid supply port, and is provided with a device for pouring a fluid for making the temperature distribution of the optical element uniform.
また、上記課題を解決するために本発明の光学素子成形
法は、ガラス素材が昇温、加圧変形されさらに加圧冷却
中に、成形型空間部に光学素子の中心温度より数℃〜数
十℃高い温度の流体を流し込み、光学素子の温度分布を
均等に調整しながら光学素子の成形を行う。Further, in order to solve the above problems, the optical element molding method of the present invention, the glass material is heated, deformed under pressure, and further under pressure cooling, several degrees to several degrees from the center temperature of the optical element in the mold space. The optical element is molded while pouring a fluid at a temperature higher by 10 ° C. and adjusting the temperature distribution of the optical element evenly.
作用 本発明は上記した構成によって、レンズ，プリズム等の
光学素子を、歪の少ない所望の光学的性能をもった形状
に成形できる。Action The present invention can form an optical element such as a lens or a prism into a shape having a desired optical performance with less distortion by the above-mentioned configuration.
実施例 以下本発明の一実施例の光学素子成形型について、図面
を参照しながら説明する。第１図は本発明の第１の実施
例における光学素子成形型の構成を示すものである。第
１図において、11は上型、12は下型で、13はガラス素材
である。また、14は液化樹脂（ポリエーテルエーテルケ
トン＜PEEK＞）の射出口で、15は空間部体積を調整する
ためのシリンダロッド摺動のガイドである。ガラス素材
13は下型12と上型11の間に供給される。Example Hereinafter, an optical element molding die according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of an optical element molding die according to the first embodiment of the present invention. In FIG. 1, 11 is an upper mold, 12 is a lower mold, and 13 is a glass material. Further, 14 is an injection port of liquefied resin (polyether ether ketone <PEEK>), and 15 is a guide for sliding a cylinder rod for adjusting the volume of the space. Glass material
13 is supplied between the lower mold 12 and the upper mold 11.
第２図は本発明の第１の実施例における光学素子成形型
の光学素子成形後の状態を示すもので、21は成形された
光学素子である。FIG. 2 shows a state after the optical element molding of the optical element molding die according to the first embodiment of the present invention, where 21 is the molded optical element.
第３図は本発明の第１の実施例における光学素子枠射出
成形時の構成を示すもので、31は溶融樹脂（PEEK）の射
出ノズルで、32,33は射出成形時のキャビティ内体積調
整のためのシリンダロッドおよびシリンダである。射出
ノズル31は射出口14に挿入される。また、シリンダロッ
ド32はガイド15に挿入される。FIG. 3 shows the structure at the time of injection molding of the optical element frame in the first embodiment of the present invention, 31 is a molten resin (PEEK) injection nozzle, and 32 and 33 are cavity volume adjustments at the time of injection molding. Cylinder rod and cylinder for. The injection nozzle 31 is inserted into the injection port 14. Further, the cylinder rod 32 is inserted into the guide 15.
第４図は本発明の第１の実施例における溶融樹脂（PEE
K）射出成形時の状態を示すもので、41は溶融樹脂（PEE
K）である。FIG. 4 shows the molten resin (PEE) in the first embodiment of the present invention.
K) shows the state at the time of injection molding, 41 is molten resin (PEE
K).
第５図は本発明の第１の実施例における光学素子枠射出
成形時の状態を示すもので、51は成形された光学素子枠
である。シリンダロッド32がガイド15に沿って光学素子
枠51の体積調整のため摺動される。FIG. 5 shows a state at the time of injection molding of the optical element frame in the first embodiment of the present invention, and 51 is the molded optical element frame. The cylinder rod 32 is slid along the guide 15 for adjusting the volume of the optical element frame 51.
以上のように構成された光学素子成形型と光学素子の製
造方法、成形された光学素子について、以下第１図，第
２図，第３図，第４図，第５図を用いて説明をする。The optical element molding die configured as described above, the method for manufacturing the optical element, and the molded optical element will be described below with reference to FIGS. 1, 2, 3, 4, and 5. To do.
第１図で供給されたガラス素材は、上型11の上部、下型
12の下部の加熱ヒータにより加熱され軟化点近傍まで昇
温される。その後上型11,下型12により加圧し、ガラス
素材を光学素子の形状に変形させるが、上型11,下型12
の階段部外周16と胴型内周17の真円度と数μｍのクリア
ランスを持たせることによって上型11と下型12の中心線
は維持されたまま摺動し第２図に示すように成形され
る。また、第２図の加圧成形後の状態を見ても分かるよ
うに第１図の胴型10の上部端面18と、下部端面19の平行
度を持たせることにより、成形面22と成形面23の平行度
は保たれる。その後、冷却加圧するが、その時第３図の
ように体積調整用シリンダロッド32を上型11,下型12の
ガイド15内に挿入、樹脂（PEEK）射出用ノズル31を射出
口14に挿入する。光学素子の温度が溶融樹脂（PEEK）の
温度より数℃〜数十℃低くなったところで、第４図のよ
うに溶融樹脂（PEEK）をキャビティ内に射出、第５図の
ように樹脂（PEEK）冷却時に光学素子枠の収縮に応じた
量だけシリンダロッド32を摺動させる。このことによっ
てキャビティ内全体に樹脂（PEEK）41が満たされ精度の
良い光学素子枠と同時に所望の形状の光学素子が形成さ
れる。また、光学素子冷却時に光学素子より数℃〜数十
℃高い温度の樹脂（PEEK）が光学素子の周辺に満たされ
るため、光学素子の温度分布が従来の成形に比べ平均化
される。樹脂（PEEK）の硬化が終了後シリンダヘッド32
と射出ノズル31を型より取り外し、胴型10を分割、光学
素子を取り出す。取り出された光学素子は光学素子枠と
一体で、第５図に示すように光学素子枠に成形される樹
脂の収縮量に応じて摺動されたシリンダロッド32の転写
により凹部を有している。この凹部を利用し鏡筒に光学
素子を取り付けるが、予め光学素子成形型の光学的非軸
対称性を測定しておくことで光学系として最も安定した
光学素子の位置決めが可能である。The glass material supplied in Fig. 1 is the upper and lower molds of the upper mold 11.
It is heated by a heater below 12 and heated up to near the softening point. After that, pressure is applied by the upper mold 11 and the lower mold 12 to transform the glass material into the shape of the optical element.
By providing roundness and a clearance of several μm between the outer circumference 16 of the staircase part and the inner circumference 17 of the body mold, the center lines of the upper mold 11 and the lower mold 12 slide while maintaining the same, as shown in FIG. Molded. Further, as can be seen from the state after pressure molding in FIG. 2, by forming the upper end surface 18 and the lower end surface 19 of the body mold 10 in FIG. The parallelism of 23 is maintained. After that, cooling and pressurization are performed. At that time, as shown in FIG. 3, the volume adjusting cylinder rod 32 is inserted into the guides 15 of the upper mold 11 and the lower mold 12, and the resin (PEEK) injection nozzle 31 is inserted into the injection port 14. . When the temperature of the optical element becomes lower than the temperature of the molten resin (PEEK) by several to several tens of degrees Celsius, the molten resin (PEEK) is injected into the cavity as shown in FIG. 4 and the resin (PEEK) as shown in FIG. ) During cooling, the cylinder rod 32 is slid by an amount corresponding to the contraction of the optical element frame. As a result, the entire cavity is filled with the resin (PEEK) 41, and an optical element frame having a high precision and an optical element having a desired shape are formed at the same time. Further, since the resin (PEEK) having a temperature higher than the optical element by several to several tens of degrees Celsius is filled around the optical element when the optical element is cooled, the temperature distribution of the optical element is averaged as compared with the conventional molding. Cylinder head 32 after curing of resin (PEEK)
The injection nozzle 31 is removed from the mold, the barrel mold 10 is divided, and the optical element is taken out. The taken out optical element is integrated with the optical element frame and has a concave portion due to the transfer of the cylinder rod 32 slid according to the shrinkage amount of the resin molded in the optical element frame as shown in FIG. .. Although the optical element is attached to the lens barrel by utilizing this concave portion, the most stable positioning of the optical element as an optical system is possible by measuring the optical non-axial symmetry of the optical element molding die in advance.
以上のような成形方法により成形された光学素子は光学
的性能に最も重要な冷却時の温度分布が均一に近いた
め、歪の少ない所望の光学的性能を得ることができる。
また、光学素子枠を光学素子と一体成形された光学素子
は、芯取りの必要がなく、取り扱いが容易になるばかり
か、非軸対称な性能を持つ光学素子の位置決めも簡単に
できる。Since the optical element molded by the above-described molding method has a temperature distribution during cooling, which is most important for optical performance, is almost uniform, desired optical performance with less distortion can be obtained.
Further, the optical element in which the optical element frame is integrally formed with the optical element does not require centering and is easy to handle, and the positioning of the optical element having non-axisymmetric performance can be easily performed.
発明の効果 以上のように本発明は、ガラス素材が昇温，加圧変形さ
れさらに加圧冷却中に、成形型空間部に光学素子の中心
温度より数℃〜数十℃高い温度の流体を流し込み、光学
素子の温度分布を均等に調整しながら光学素子の成形を
行うことにより、成形後の光学素子に歪が少なく所望の
光学的性能を持たせることができる。EFFECTS OF THE INVENTION As described above, according to the present invention, while the glass material is heated, deformed under pressure, and further cooled under pressure, a fluid having a temperature of several degrees Celsius to several tens of degrees Celsius higher than the central temperature of the optical element is supplied to the molding space. By pouring and molding the optical element while adjusting the temperature distribution of the optical element to be uniform, the optical element after molding can have desired optical performance with less distortion.
従って、本発明により所望の光学的性能の光学素子を精
度よく成形することができ、量産時の不良率を著しく低
減でき、本発明の工業的価値は大なるものがある。Therefore, according to the present invention, an optical element having a desired optical performance can be accurately molded, the defective rate in mass production can be remarkably reduced, and the industrial value of the present invention is great.
第１図は本発明の第１の実施例における光学素子成形型
の構成断面図、第２図は本発明の第１の実施例における
光学素子成形型の状態断面図、第３図は本発明の第１の
実施例における光学素子枠成形時の型構成断面図、第４
図は本発明の第１の実施例における光学素子枠射出成形
時の型状態断面図、第５図は本発明の第１の実施例にお
ける光学素子成形後の型状態断面図、第６図は従来の光
学素子成形型の状態断面図である。 10……胴型、11……上型、12……下型、13……ガラス素
材、14……射出口、15……シリンダガイド、16……階段
部外周、17……胴型内周、21……成形された光学素子、
31……射出ノズル、32……シリンダロッド、33……シリ
ンダ、41……溶融樹脂（ポリエーテルエーテルケトン＜
PEEK＞）、51……成形された光学素子枠、61……上型、
62……下型、63……胴型、64……成形されたレンズ。FIG. 1 is a sectional view showing the structure of an optical element molding die according to the first embodiment of the present invention, FIG. 2 is a sectional view showing the optical element molding die according to the first embodiment of the present invention, and FIG. FIG. 4 is a cross-sectional view of a mold configuration at the time of molding the optical element frame in the first example of FIG.
FIG. 5 is a sectional view of a mold state during injection molding of an optical element frame according to the first embodiment of the present invention, FIG. 5 is a sectional view of a mold state after molding of an optical element according to the first embodiment of the present invention, and FIG. It is a state sectional view of a conventional optical element molding die. 10 …… Cylinder type, 11 …… Upper mold, 12 …… Lower mold, 13 …… Glass material, 14 …… Injection port, 15 …… Cylinder guide, 16 …… Stair step outer circumference, 17 …… Cylinder mold inner circumference , 21 …… Molded optical element,
31 …… Injection nozzle, 32 …… Cylinder rod, 33 …… Cylinder, 41 …… Molten resin (polyetheretherketone <
PEEK>), 51 ... Molded optical element frame, 61 ... Upper mold,
62 …… Lower mold, 63 …… Body mold, 64 …… Molded lens.
Claims (2)
成形面を持つ一対の押圧型を備え、光学素子を成形する
空間部に、前記押圧型と、前記胴型との間に、流体を満
たす空間部を具備する光学素子成形型を用い、満たした
流体により光学素子の温度を調整しながら成形する光学
素子成形方法。1. A cylinder die and a pair of pressing dies having one or more molding surfaces that slide in the cylinder die, wherein the pressing die and the cylinder die are provided in a space for molding an optical element. An optical element molding method in which an optical element molding die having a space filled with a fluid is used, and molding is performed while adjusting the temperature of the optical element with the filled fluid.
点温度より数℃〜数十℃高い温度で溶融状態である物質
であることを特徴とする請求項（１）記載の光学素子成
形方法。2. The optical element molding according to claim 1, wherein the fluid is a substance that is in a molten state at a temperature of several degrees Celsius to several tens of degrees Celsius higher than the transition point temperature of the glass used as the material of the optical element. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63321196A JPH0798669B2 (en) | 1988-12-20 | 1988-12-20 | Optical element molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63321196A JPH0798669B2 (en) | 1988-12-20 | 1988-12-20 | Optical element molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02164730A JPH02164730A (en) | 1990-06-25 |
| JPH0798669B2 true JPH0798669B2 (en) | 1995-10-25 |
Family
ID=18129864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63321196A Expired - Fee Related JPH0798669B2 (en) | 1988-12-20 | 1988-12-20 | Optical element molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0798669B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013132708A1 (en) | 2012-03-08 | 2013-09-12 | 富士フイルム株式会社 | Composite molded lens, method for manufacturing same, molding die and imaging module |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2502718B2 (en) * | 1988-12-20 | 1996-05-29 | 松下電器産業株式会社 | Optical element molding die, optical element molding method, and optical element |
| JP2007022905A (en) * | 2005-06-16 | 2007-02-01 | Sony Corp | Optical element device manufacturing method, optical element device, and molding apparatus |
| JP5269477B2 (en) * | 2008-05-23 | 2013-08-21 | オリンパス株式会社 | Optical element manufacturing method, optical element manufacturing apparatus, and optical element |
| EP2826617B1 (en) * | 2012-03-29 | 2017-06-28 | Fujifilm Corporation | Optical element manufacturing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62216928A (en) * | 1986-03-19 | 1987-09-24 | Canon Inc | glass mold |
| JP2502718B2 (en) * | 1988-12-20 | 1996-05-29 | 松下電器産業株式会社 | Optical element molding die, optical element molding method, and optical element |
-
1988
- 1988-12-20 JP JP63321196A patent/JPH0798669B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013132708A1 (en) | 2012-03-08 | 2013-09-12 | 富士フイルム株式会社 | Composite molded lens, method for manufacturing same, molding die and imaging module |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02164730A (en) | 1990-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100451686C (en) | Manufacturing method of optical unit, optical unit and forming device thereof | |
| JPH09234774A (en) | Injection molding method for plastic lenses | |
| JPH10101347A (en) | Device for injection-molding optical parts and injection-molding method | |
| JP6739131B2 (en) | Mold for molding optical component made of glass and method for manufacturing optical component made of glass using the mold | |
| JPH0798669B2 (en) | Optical element molding method | |
| CN101890817A (en) | Method for Imprinting and Forming Lens Arrays | |
| KR20080067651A (en) | Molding method and apparatus for molding optical element | |
| JP2001180946A (en) | Method for forming optical glass element and forming apparatus for optical glass with method | |
| JP2009255468A (en) | Two-color molding die and two-color molding method | |
| JP2502718B2 (en) | Optical element molding die, optical element molding method, and optical element | |
| JPH02175115A (en) | High precision molding of plastic lens and molding device therefor | |
| JPS6119409B2 (en) | ||
| JP2001270724A (en) | Optical lens and its mold | |
| JP2000247653A (en) | Mold for molding optical element and optical element | |
| JP2504817B2 (en) | Optical element molding method | |
| JPH0547488B2 (en) | ||
| JPS60171233A (en) | glass lens molding equipment | |
| JP2010143129A (en) | Method for molding resin lens | |
| JPH0255235A (en) | Glass lens mold and molding method | |
| JP3209722B2 (en) | Method for molding optical element and optical element | |
| JPH0570155A (en) | Mold for glass lens molding | |
| GB2088273A (en) | Method of making biaspherical optical elements | |
| JP3135387B2 (en) | Optical element with lens barrel and method of manufacturing the same | |
| JP3176717B2 (en) | Optical element molding method | |
| JP3130621B2 (en) | Optical element molding method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |