JP3264704B2 - Optical element molding die and method of manufacturing the same - Google Patents
Optical element molding die and method of manufacturing the sameInfo
- Publication number
- JP3264704B2 JP3264704B2 JP26694092A JP26694092A JP3264704B2 JP 3264704 B2 JP3264704 B2 JP 3264704B2 JP 26694092 A JP26694092 A JP 26694092A JP 26694092 A JP26694092 A JP 26694092A JP 3264704 B2 JP3264704 B2 JP 3264704B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- optical element
- mold
- molding die
- lens
- 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
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
- C03B2215/40—Product characteristics
- C03B2215/404—Products with identification marks
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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は光学機器（例えば、コン
パクトディスクなど）に使用されるレンズなどを成形す
る際に用いられる光学素子成形用金型およびその製造方
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 mold for molding an optical element used for molding a lens or the like used for an optical device (for example, a compact disk) and a method for producing the same.
【０００２】[0002]
【従来の技術】近年、光学レンズなどを研磨工程なしの
一発成形により形成する試みがなされており、現在各社
ではすでに量産段階にある。ガラス素材を溶融状態から
型に流しこみ加圧成形する方法が最も能率的であるが、
冷却時のガラスの収縮を制御することが難しく、精密な
レンズ成形には適さない。従ってガラス素材を一定の形
状に予備加工して、これを型の間に供給し、加熱、押圧
成形するのが一般的な方法である（例えば、特開昭５８
−８４１３号公報、特開昭６０−２００８３３号公報参
照）。2. Description of the Related Art In recent years, attempts have been made to form an optical lens or the like by one-shot molding without a polishing step, and each company is already in a mass production stage. The most efficient method is to pour the glass material into the mold from the molten state and press-mold it.
It is difficult to control the shrinkage of the glass during cooling, and it is not suitable for precise lens molding. Therefore, it is a general method to pre-process a glass material into a predetermined shape, supply the pre-processed material between molds, and heat and press-mold the glass material (for example, see Japanese Unexamined Patent Application Publication No.
-8413, JP-A-60-200833).
【０００３】図４は円柱状のガラス素材を成形してレン
ズを形成した状態を示す従来例の断面図であり、１は成
形されたレンズ、２および３は一対の成形型となる上型
および下型、４は前記上型２および下型３による成形部
を取り巻く胴型、５および６はヒータ７および８が内蔵
された加熱板で、加熱板５の下面に前記上型２が取り付
けられ、加熱板６の上面に前記下型３が取り付けられて
いる。９は前記上型２を取り付ける加熱板５を支持して
レンズ１のガラス素材を加圧する昇降自在な加圧機構、
10は下側の加熱板６を受けて支持する基台である。FIG. 4 is a sectional view of a conventional example showing a state in which a lens is formed by molding a cylindrical glass material, wherein 1 is a molded lens, 2 and 3 are an upper mold and a pair of molding dies. The lower mold 4 is a body mold surrounding the molded part formed by the upper mold 2 and the lower mold 3, and 5 and 6 are heating plates in which heaters 7 and 8 are built in. The upper mold 2 is attached to the lower surface of the heating plate 5. The lower die 3 is attached to the upper surface of the heating plate 6. Reference numeral 9 denotes a vertically movable pressurizing mechanism for supporting the heating plate 5 to which the upper mold 2 is attached and pressurizing the glass material of the lens 1.
Reference numeral 10 denotes a base that receives and supports the lower heating plate 6.
【０００４】上記構成における動作を説明すると、ガラ
ス素材を前記上型２および下型３との間の成形部に供給
し、前記加熱板５および６で加熱された上型２および下
型３間でガラス素材をガラスの軟化点近傍の温度まで加
熱しながら加圧変形させる。変形が終了後は成形された
レンズを徐々に冷却してレンズが取り出せる温度になる
と上型２を上方に開き、レンズを取り出し成形を完了す
る。The operation of the above configuration will be described. A glass material is supplied to a molding section between the upper mold 2 and the lower mold 3 and the glass material is heated between the upper mold 2 and the lower mold 3 heated by the heating plates 5 and 6. The glass material is deformed under pressure while heating to a temperature near the softening point of the glass. After the deformation is completed, when the molded lens is gradually cooled to reach a temperature at which the lens can be taken out, the upper mold 2 is opened upward, and the lens is taken out and the molding is completed.
【０００５】このような成形で得られたレンズは通常、
レンズが有する各収差（非点収差、コマ収差、球面収
差）などが非常に少なく、レベルの高いものである。[0005] The lens obtained by such a molding is usually
The aberrations (astigmatism, coma, spherical aberration) and the like of the lens are very small and high.
【０００６】[0006]
【発明が解決しようとする課題】しかし、成形レンズの
量産数が増し使用する金型面数が多くなると、レンズ単
品の性能は満足されても後工程（レンズをピックアップ
に組み立てる工程）で若干の不良品が発生する課題があ
る。この課題に対し、どの金型で成形されたレンズが後
工程で不良品になっているかをいち早く発見し対応策を
講じなければならない。また、成形レンズを機器に組み
込む際には、特に非点収差の方向性をレンズの各々につ
いてマーキング（通常アスマークと呼ぶ）を成形された
全てのレンズについて行なわなければならない。However, as the mass production of molded lenses increases and the number of mold surfaces used increases, even if the performance of a single lens product is satisfied, a slight amount will be required in the post-process (process of assembling the lens into a pickup). There is a problem of defective products. To cope with this problem, it is necessary to promptly find out which mold is used to form a defective lens in a post-process and take a countermeasure. In addition, when a molded lens is incorporated in an apparatus, in particular, the directionality of astigmatism must be set for all the lenses which have been marked (usually called as marks) for each lens.
【０００７】その理由は、レンズのアスマークとディス
ク表面に形成された信号（ピット）との位置関係を正確
に配置することによってピット間のクロストーク（法線
方向のピット間）や符号間干渉（周方向のピット間）を
軽減し、機器の性能を高めようとするからである。The reason for this is that by accurately arranging the positional relationship between the asmark of the lens and the signal (pit) formed on the disk surface, crosstalk between pits (between pits in the normal direction) and intersymbol interference (between pits). This is because it is intended to reduce the distance between circumferential pits and improve the performance of the device.
【０００８】上述した２つの課題に対しては多大の労力
を必要とし、レンズのコストダウンと量産性を妨げ、産
業上好ましくない。本発明はこのような課題を解決する
もので、従来行なっていたアスマークの作業を不要に
し、光学素子を安価に提供できるようにすることを目的
とするものである。The above two problems require a great deal of labor, hinder cost reduction and mass productivity of the lens, and are not industrially preferable. An object of the present invention is to solve such a problem and eliminate the need for a conventional asmark operation, and to provide an optical element at low cost.
【０００９】[0009]
【課題を解決するための手段】この課題を解決するため
に本発明の光学素子成形用金型は、一対の上型と下型と
を用いて非点収差を有する光学素子を成形するものであ
って、凸状もしくは凹状の複数の小さな点で構成されか
つ非点収差を形成させる核となるマークが前記上型もし
くは下型の少なくともいずれか一方の非光学機能成形面
に付与されていることを要旨とするものである。また本
発明の光学素子成形用金型の製造方法は、光学機能面と
非光学機能面とを有する光学素子を成形する一対の上型
と下型とから成る光学素子成形用金型の製造方法であっ
て、前記光学機能面と非光学機能面とを所定の形状に加
工しかつ鏡面に研磨する工程と、凸状もしくは凹状の複
数の小さな点で構成されかつ非点収差を形成させる核と
なるマークを前記上型もしくは下型の少なくともいずれ
か一方の非光学機能面に加工する工程と、前記上型およ
び下型の成形面に離形膜を形成する工程とを有すること
を要旨とするものである。SUMMARY OF THE INVENTION In order to solve this problem, a mold for molding an optical element of the present invention is a mold for molding an optical element having astigmatism using a pair of an upper mold and a lower mold. In addition, a mark which is composed of a plurality of small points having a convex or concave shape and forms a nucleus for forming astigmatism is provided on at least one of the non-optical function molding surfaces of the upper mold or the lower mold. It is the gist. The method of manufacturing an optical element molding die according to the present invention is directed to a method of manufacturing an optical element molding die including a pair of an upper mold and a lower mold for molding an optical element having an optically functional surface and a non-optically functional surface. A step of processing the optical functional surface and the non-optical functional surface into a predetermined shape and polishing to a mirror surface, and a nucleus formed of a plurality of small points having a convex or concave shape and forming astigmatism. A process of forming a mark on the non-optical functional surface of at least one of the upper mold and the lower mold, and a step of forming a release film on a molding surface of the upper mold and the lower mold. Things.
【００１０】[0010]
【作用】上記のように、非光学機能面に設けた凸部また
は凹部の点群によって光学素子との相関を明確にし、ま
た凸部または凹部の点群に充填された部分を核にして冷
却時に収縮の差が生じ、光学素子全体の性能を維持しつ
つ適度な非点収差を発生させることで、従来行なってい
たアスマーキングの作業を不要にし、光学素子を安価に
提供できる。As described above, the correlation with the optical element is clarified by the point group of the convex portion or the concave portion provided on the non-optical function surface, and cooling is performed by using the portion filled in the point group of the convex portion or the concave portion as a nucleus. Occasionally, a difference in shrinkage occurs, and an appropriate astigmatism is generated while maintaining the performance of the entire optical element, so that the conventional asmarking operation is unnecessary, and the optical element can be provided at low cost.
【００１１】[0011]
【実施例】以下、本発明の一実施例について、図面に基
づいて説明する。図１において、成形型11は前記従来例
で用いた下型３と同寸法で、成形面に設けられた形状も
同様のものが得られるようにした。この成形型11は、円
柱状で超硬合金からなる基材の端面に成形面を構成する
図中Ａの領域で示される光学機能面12と、Ｂの領域で示
される非光学機能面13とを備え、さらに、非光学機能面
13は光学機能面12から延長された傾斜部14と平面部15と
を備えるように、ダイヤモンド砥石を用いて所定の形状
と鏡面に研磨加工が施された。また、この成形型11は外
径５．０ｍｍ、厚み６．０ｍｍで、円柱状の端面にＡの
領域の寸法が３．０ｍｍ、Ｂの領域の寸法が１．０ｍｍ
で、Ｂの領域のうち傾斜部14を０．５ｍｍ、平面部15を
０．５ｍｍとし、かつ所望する光学性能が得られるよう
に成形面が加工されている。次に、非光学機能面13の傾
斜部14と平面部15とに凹部が点群状に存在するように加
工を行なった。加工箇所が非常に小さいため作業は顕微
鏡を用いたものとなるので、本実施例では市販されてい
るビッカース硬度計を用い先端が四角錐のダイヤモンド
圧子に１グラムの荷重をかけて凹部の加工を行なった。
加工された凹部は凹状の四角錐でその表面は鏡面状態で
あり、その大きさは４〜５ミクロンであった。圧子の形
状および圧子にかける荷重を制御すればどのような型材
料を用いてもある範囲内で任意の大きさと形状の凹部を
加工することが可能である。しかし、現実的には凹部の
量が大きいと凹部周辺に素材の盛り上がりが発生するた
め、望ましくは軽荷重で凹部の量を少なくするのがよ
い。なお、本実施例では成形面に凹部を点群状に加工し
たが、別段、文字、数字、記号を表現できれば本実施例
に限らず本発明の主旨に合致するものであれば他の方法
で加工してもよい。An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a molding die 11 has the same dimensions as the lower die 3 used in the conventional example, and the same shape is provided on the molding surface. The molding die 11 has an optically functional surface 12 indicated by a region A in the figure and a non-optically functional surface 13 indicated by a region B in the figure, which form a molding surface on the end surface of a substrate made of a cemented carbide having a columnar shape. And a non-optical function surface
13 was polished to a predetermined shape and mirror surface using a diamond grindstone so as to have an inclined portion 14 and a flat portion 15 extended from the optical function surface 12. The molding die 11 has an outer diameter of 5.0 mm and a thickness of 6.0 mm, and has a cylindrical end face having a dimension of the area A of 3.0 mm and a dimension of the area B of 1.0 mm.
In the region B, the inclined surface 14 is set to 0.5 mm, the plane portion 15 is set to 0.5 mm, and the molding surface is processed so as to obtain desired optical performance. Next, processing was performed so that concave portions existed in the point group at the inclined portion 14 and the flat portion 15 of the non-optical function surface 13. Since the working area is very small, the work is performed using a microscope. In this embodiment, a commercially available Vickers hardness tester is used to apply a load of 1 gram to a diamond indenter having a square pyramid tip to process the recess. Done.
The processed concave portion was a concave quadrangular pyramid, the surface of which was a mirror surface, and the size was 4 to 5 microns. By controlling the shape of the indenter and the load applied to the indenter, it is possible to process a recess having an arbitrary size and shape within a certain range using any mold material. However, in reality, when the amount of the concave portion is large, the material swells around the concave portion. Therefore, it is desirable to reduce the amount of the concave portion with a light load. In the present embodiment, the concave portion is formed in the shape of a point cloud on the molding surface. However, the present invention is not limited to the present embodiment as long as it can express characters, numerals, and symbols. It may be processed.
【００１２】例えば、半導体プロセスに見られるような
ワイヤーボンディング技術や、精密なスポット溶接技
術、メッキなどの技術などにより、耐熱性の高い金属材
料を用いて成形面に凸部を点群状に付着加工することも
可能である。For example, by using a wire bonding technology such as a semiconductor process, a precise spot welding technology, a plating technology, or the like, a convex portion is attached to a molding surface in a point cloud shape using a metal material having high heat resistance. Processing is also possible.
【００１３】図２は成形型11に前述した条件で前記平面
部15に四角錐の凹部16を９個の点群にして「Ｉ」の文字
を描いた状態を示し、描かれた文字は実態顕微鏡で充分
確認できる大きさであった。また、傾斜部14にも同様の
文字を同様の条件で描いた結果、同様に文字の配列に凹
部17が形成されている。FIG. 2 shows a state where the letter "I" is drawn on the plane part 15 in the form of nine points in the plane part 15 under the above-described conditions in the molding die 11, and the drawn character is the actual state. It was large enough to be seen under a microscope. Also, as a result of drawing similar characters on the inclined portion 14 under the same conditions, concave portions 17 are similarly formed in the character arrangement.
【００１４】その後、上記凹部を設けた成形面全体に成
形時におけるガラスの融着を防止する離型膜をスパッタ
法で成膜した。成膜の厚みは２ミクロンとし、前記凹部
の表面にも均一に成膜されていることを顕微鏡で確認し
た。Thereafter, a release film for preventing fusion of the glass during molding was formed on the entire molding surface provided with the concave portion by a sputtering method. The thickness of the film was 2 μm, and it was confirmed by a microscope that the film was uniformly formed on the surface of the concave portion.
【００１５】当然のことながら文字、数字、記号を示す
凹部の加工を行なう場合には、成形レンズに転写された
文字、数字あるいは記号が読み取り易いようにするのが
よい。さらに、本実施例では離型膜を成膜する前に凹部
加工を行なったが、成膜後に行なっても同様の効果が期
待できるものである。Naturally, in the case of processing a concave portion indicating a character, a number, or a symbol, it is preferable that the character, number, or symbol transferred to the molded lens is easily read. Further, in this embodiment, the concave portion processing is performed before the release film is formed, but the same effect can be expected even after the release film is formed.
【００１６】図３は前述した実施例の成形金型と、ＳＦ
−８（鉛系ガラス）からなる成形用ガラス素材を用いて
従来例と同様にして５２０℃で成形を行なって得られた
成形レンズを示す。成形レンズ18には前記凹部16，17に
より凸部19，20が形成されている。成形レンズ18におけ
る凹部部分の転写性の確認と、光学性能の確認とを行な
った結果、前記傾斜部14に設けた凹部17での転写性は成
形レンズの全てについて満足するものが得られたが、平
面部15に設けた凹部16での転写性は一部分に未転写部が
発生した。その理由は若干量のガラス材料の重量変動
や、転写領域の変動から発生するものである。従って、
非光学機能面の傾斜部14に凹部17を設けるのが望まし
い。その理由は上記の他に、成形されたレンズの平面部
15は機器への取付基準面として使用することが多く、突
起の出た平面を基準面として使いづらいからである。FIG. 3 shows a molding die of the above-described embodiment and SF
A molded lens obtained by molding at 520 ° C. using a molding glass material made of -8 (lead-based glass) in the same manner as in the conventional example is shown. Convex portions 19 and 20 are formed in the molded lens 18 by the concave portions 16 and 17. As a result of confirming the transferability of the concave portion in the molded lens 18 and confirming the optical performance, the transferability in the concave portion 17 provided in the inclined portion 14 was satisfactory for all of the molded lenses. On the other hand, the transferability at the concave portion 16 provided in the flat portion 15 was partially untransferred. The reason arises from a slight change in the weight of the glass material and a change in the transfer area. Therefore,
It is desirable to provide a concave portion 17 in the inclined portion 14 of the non-optical function surface. The reason is other than the above, the flat part of the molded lens
15 is often used as a reference plane for attachment to equipment, and it is difficult to use a plane with a projection as a reference plane.
【００１７】さらに、フィーゾ型の干渉計を用いて成形
レンズの透過波面収差を測定した。その結果、平面部15
に設けた凹部16の転写はレンズ全体の性能には何ら影響
の無いことが確認された。しかし、傾斜部14に設けた凹
部17の転写はレンズの非点収差に関係し、凹部の極近傍
とそれ以外の部分とにおいて収縮時におけるひけの差が
確認された。しかも、レンズ全体の性能は０．０３λ程
度で充分実用に供せるものであった。Further, the transmitted wavefront aberration of the molded lens was measured using a Fizeau type interferometer. As a result, the flat portion 15
It was confirmed that the transfer of the concave portion 16 provided on the lens had no effect on the performance of the entire lens. However, the transfer of the concave portion 17 provided in the inclined portion 14 was related to the astigmatism of the lens, and a difference in sink at the time of contraction between the very vicinity of the concave portion and the other portion was confirmed. Moreover, the performance of the entire lens was about 0.03λ, which was sufficient for practical use.
【００１８】[0018]
【発明の効果】以上のように本発明によれば、非光学機
能面に設けた凸部または凹部の点群によって光学素子と
の相関を明確にし、また凸部または凹部の点群に充填さ
れた部分を核にして冷却時に収縮の差が生じ、光学素子
全体の性能を維持しつつ適度な非点収差を発生させるこ
とで、従来行なっていたアスマーキングの作業を不要に
し、光学素子を安価に提供できる。As described above, according to the present invention, the correlation with the optical element is clarified by the point group of the convex or concave portion provided on the non-optical function surface, and the point group of the convex or concave portion is filled. A difference in shrinkage occurs during cooling with the part as a nucleus when cooling, generating moderate astigmatism while maintaining the performance of the entire optical element, eliminating the need for conventional asmarking work, and making the optical element inexpensive Can be provided.
【図１】本発明の一実施例における光学素子成形型の断
面図である。FIG. 1 is a sectional view of an optical element forming die according to an embodiment of the present invention.
【図２】同光学素子成形型の斜視図である。FIG. 2 is a perspective view of the optical element molding die.
【図３】同光学素子成形型を用いて成形された成形レン
ズの斜視図である。FIG. 3 is a perspective view of a molded lens molded using the optical element molding die.
【図４】従来例における成形状態を示す縦断面図であ
る。FIG. 4 is a longitudinal sectional view showing a molding state in a conventional example.
11 成形型 12 光学機能面 13 非光学機能面 14 傾斜部 15 平面部 16 凹部 17 凹部 18 成形レンズ 19 凸部 20 凸部 11 Mold 12 Optically functional surface 13 Non-optically functional surface 14 Inclined part 15 Flat part 16 Concave part 17 Concave part 18 Molded lens 19 Convex part 20 Convex part
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−80430（ＪＰ，Ａ) 特開 昭53−1047（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 11/00 - 11/16 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-80430 (JP, A) JP-A-53-1047 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C03B 11/00-11/16
Claims (4)
有する光学素子を成形する光学素子成形用金型であっ
て、凸状もしくは凹状の複数の小さな点で構成されかつ
非点収差を形成させる核となるマークが前記上型もしく
は下型の少なくともいずれか一方の非光学機能成形面に
付与されていることを特徴とする光学素子成形用金型。An astigmatism is reduced by using a pair of an upper mold and a lower mold.
An optical element molding die for molding an optical element having
Composed of a plurality of small points, convex or concave, and
The mark serving as a nucleus for forming astigmatism is the upper mold or
Is on at least one non-optical function molding surface of the lower mold.
An optical element molding die, characterized in that have been granted.
学機能部に付与されている請求項１記載の光学素子成形
用金型。2. The method according to claim 1, wherein the mark is a non-light on the optical function molding surface.
The mold for molding an optical element according to claim 1, wherein the mold is provided to a scientific function part .
１または２記載の光学素子成形用金型。3. The optical element molding die according to claim 1, wherein the shape of the small point is a cone.
学素子を成形する一対の上型と下型とから成る光学素子
成形用金型の製造方法であって、前記光学機能面と非光
学機能面とを所定の形状に加工しかつ鏡面に研磨する工
程と、凸状もしくは凹状の複数の小さな点で構成されか
つ非点収差を形成させる核となるマークを前記上型もし
くは下型の少なくともいずれか一方の非光学機能面に加
工する工程と、前記上型および下型の成形面に離形膜を
形成する工程とを有することを特徴とする光学素子成形
用金型の製造方法。4. Light having an optically functional surface and a non-optically functional surface.
Element consisting of a pair of upper and lower molds for forming a chemical element
A method of manufacturing a molding die, comprising:
A process of processing a functional surface into a predetermined shape and polishing it to a mirror surface
The process consists of a number of small points, convex or concave.
The core mark that forms astigmatism is
Or at least one non-optical function surface of the lower mold
And releasing a release film on the molding surfaces of the upper mold and the lower mold.
Forming a mold for molding an optical element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26694092A JP3264704B2 (en) | 1992-10-06 | 1992-10-06 | Optical element molding die and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26694092A JP3264704B2 (en) | 1992-10-06 | 1992-10-06 | Optical element molding die and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06115955A JPH06115955A (en) | 1994-04-26 |
| JP3264704B2 true JP3264704B2 (en) | 2002-03-11 |
Family
ID=17437805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26694092A Expired - Fee Related JP3264704B2 (en) | 1992-10-06 | 1992-10-06 | Optical element molding die and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3264704B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19511656C2 (en) * | 1995-03-30 | 1997-11-27 | Wieland Werke Ag | Partially hot-dip tinned tape |
| JP3664522B2 (en) * | 1995-07-18 | 2005-06-29 | 松下電器産業株式会社 | Optical element molding die, optical element molding method, and optical element |
| JP5103772B2 (en) * | 2006-03-29 | 2012-12-19 | コニカミノルタアドバンストレイヤー株式会社 | Optical lens injection mold |
| JP5211451B2 (en) * | 2006-08-24 | 2013-06-12 | 凸版印刷株式会社 | Mold management method |
| JP5076618B2 (en) * | 2007-04-26 | 2012-11-21 | コニカミノルタアドバンストレイヤー株式会社 | Glass lens for optical pickup device |
-
1992
- 1992-10-06 JP JP26694092A patent/JP3264704B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06115955A (en) | 1994-04-26 |
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