JPH11189425A - Mold for lens formation - Google Patents
Mold for lens formationInfo
- Publication number
- JPH11189425A JPH11189425A JP28251598A JP28251598A JPH11189425A JP H11189425 A JPH11189425 A JP H11189425A JP 28251598 A JP28251598 A JP 28251598A JP 28251598 A JP28251598 A JP 28251598A JP H11189425 A JPH11189425 A JP H11189425A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- molding
- depression
- mold
- molding surface
- 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.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 238000000465 moulding Methods 0.000 claims abstract description 95
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 description 34
- 238000000034 method Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000005304 optical glass Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 for example Chemical compound 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、レンズ成形用型、
特に凹面を有するレンズを成形するのに好適なレンズ成
形用型、および、前記のレンズ成形用型を用いたレンズ
の製造方法に関する。[0001] The present invention relates to a lens molding die,
In particular, the present invention relates to a lens molding die suitable for molding a lens having a concave surface, and a method for manufacturing a lens using the lens molding die.
【０００２】[0002]
【従来の技術】従来、レンズの成形方法として、ガラス
素材と成形用型を、ガラス素材が軟化する温度（１０
7.5 〜１０11ポアズのガラス粘度に相当する温度）まで
加熱して、ガラス素材を型によってプレス成形し、そし
てガラスの転移温度（１０13ポアズ）付近或いはそれ以
下まで冷却してから離型を行い、レンズを型から取り出
す方法が知られている。2. Description of the Related Art Conventionally, as a method of forming a lens, a glass material and a molding die are heated at a temperature (10 ° C.) at which the glass material softens.
The glass material is pressed by a mold by heating to a temperature corresponding to a glass viscosity of 7.5 to 10 11 poise), and cooled to a temperature close to or lower than the glass transition temperature (10 13 poise), and then released. A method for removing a lens from a mold is known.
【０００３】この成形方法により両凸レンズを成形する
場合には、プレス温度から離型温度までの冷却過程で、
ガラスと成形型の収縮差（一般に、型の収縮係数が小さ
い）により、図１０に示すように、型１，２とレンズ３
との間に隙間４が生じるため、この隙間４から空気が型
１，２とレンズ３の間に入り、レンズ３を容易に離型す
ることができる。When a biconvex lens is molded by this molding method, a cooling process from a press temperature to a release temperature is performed.
Due to the difference in shrinkage between the glass and the mold (generally, the shrinkage coefficient of the mold is small), as shown in FIG.
Is formed between the molds 1 and 2, and the lens 3 can be easily released from the mold.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、凹面を
有するレンズを成形する場合には、冷却時のガラスと成
形型の収縮差により、図１１に示すように、型１とレン
ズ３の間に、密閉された隙間空間５が生じ、この隙間空
間５が負圧であるため、レンズ３が型１に貼り付き、離
型が困難であった。この場合、レンズ３に物理的な力を
加えて離型すると、レンズ３の面精度を損なうという問
題点があった。However, when a lens having a concave surface is molded, the difference between the shrinkage between the glass and the mold during cooling causes a difference between the mold 1 and the lens 3 as shown in FIG. The closed gap space 5 is generated, and since the gap space 5 has a negative pressure, the lens 3 sticks to the mold 1 and it is difficult to release the mold. In this case, if a physical force is applied to the lens 3 to release it, there is a problem that the surface accuracy of the lens 3 is impaired.
【０００５】そこで本発明は、レンズの離型が容易であ
るレンズ成形用型を提供することを第１の目的とする。Accordingly, it is a first object of the present invention to provide a lens molding die in which a lens can be easily released.
【０００６】また、本発明は、プレス成形後にレンズを
容易に離型することができるレンズの製造方法を提供す
ることを第２の目的とする。It is a second object of the present invention to provide a method of manufacturing a lens which can easily release a lens after press molding.
【０００７】[0007]
【課題を解決するための手段】上記第１の目的は、成形
面が内側になるようにして互いに対向配置される１組の
型を備え、これら１組の型それぞれの成形面がレンズの
有効径よりも大きな径を有し、かつ、前記１組の型のう
ちの少なくとも一方の型がその成形面に窪みを有し、前
記の窪みが、平面視上、前記の成形面におけるレンズの
有効径よりも外側の箇所に形成されており、しかも、該
窪みによって形成されたレンズの突起部分が成形後の被
成形素材収縮時に該窪みの周囲の成形面に乗り上げるよ
うな形状を有しているレンズ成形用型によって達成され
る。A first object of the present invention is to provide a set of dies which are arranged to face each other such that the forming surfaces are on the inside, and the forming surfaces of each of the sets of dies are effective for the lens. A diameter larger than the diameter, and at least one of the molds in the set has a depression in a molding surface thereof, and the depression is, in plan view, effective for a lens on the molding surface. It is formed at a position outside the diameter, and has such a shape that the protruding portion of the lens formed by the depression rides on the molding surface around the depression when the material to be molded after molding is contracted. Achieved by a lens mold.
【０００８】また、上記第２の目的は、成形面が内側に
なるようにして互いに対向配置される１組の型を備え、
これら１組の型それぞれの成形面がレンズの有効径より
も大きな径を有しているレンズ成形用型を用いたプレス
法によってレンズを製造するにあたり、前記１組の型の
うちの少なくとも一方として、成形面に窪みを有し、前
記の窪みが、平面視上、前記の成形面におけるレンズの
有効径よりも外側の箇所に形成されている型を用い、前
記窪みによって形成されたレンズの突起部分が成形後に
起きる被成形素材の収縮によって該窪みの周囲の成形面
に乗り上げた後に離型することによって達成される。A second object of the present invention is to provide a pair of dies which are arranged to face each other such that a molding surface faces inside,
In manufacturing a lens by a pressing method using a lens forming mold in which the molding surface of each of these one set of molds has a diameter larger than the effective diameter of the lens, at least one of the one set of molds is used. A projection formed on the molding surface by using a mold having a depression on the molding surface, wherein the depression is formed outside the effective diameter of the lens on the molding surface in plan view. This is achieved by releasing the mold after the part has climbed onto the molding surface around the depression by the contraction of the molding material occurring after molding.
【０００９】本発明の場合には、型の窪みに嵌まってい
るレンズの突起部分が、レンズ収縮時に、窪みから乗り
上げるため、窪みと窪みの間において型とレンズの間に
隙間が形成される。従って、この隙間から内側（型また
はレンズの中央側）へ空気が入るため、レンズは型から
容易に離型される。In the case of the present invention, a gap is formed between the mold and the lens between the depressions because the projection of the lens fitted in the depression of the mold runs over the depression when the lens is contracted. . Accordingly, since air enters from the gap to the inside (center side of the mold or the lens), the lens is easily released from the mold.
【００１０】[0010]
【実施例】次に、図を参照して本発明の実施例を詳しく
説明する。図１は、本実施例によるレンズ成形用型（上
型）１０の成形面１１を下側から見た図、図２は図１の
レンズ成形用型１０をII−II線に沿って切断して示す部
分拡大図である。この成形型１０は凹レンズを成形する
ためのものであり、そのため、その成形面１１は凸面状
に形成されている。成形用型１０は、レンズの有効径ｒ
よりも大きな直径Ｒを有する（例えば成形用型の直径Ｒ
が２８ｍｍφで、レンズの有効径ｒが２３ｍｍφであ
る）。Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view of a molding surface 11 of a lens molding die (upper die) 10 according to the present embodiment as viewed from below, and FIG. 2 is a cross-sectional view of the lens molding die 10 of FIG. 1 taken along line II-II. FIG. This molding die 10 is for molding a concave lens, and therefore, its molding surface 11 is formed in a convex shape. The molding die 10 has an effective diameter r of the lens.
Having a larger diameter R (eg, the diameter R of the mold).
Is 28 mmφ, and the effective diameter r of the lens is 23 mmφ).
【００１１】レンズの有効径ｒの外側において、成形面
１１には、本発明に従って、断続的な（連続していな
い）窪み１２が複数個（本実施例では４個）形成されて
いる。この窪み１２は直径Ｋ（例えば２６ｍｍφ）の円
周に沿って等間隔をおいて配置されている。本実施例の
窪み１２は周方向に細長い形をしていて、その横断面は
図２に示すようにほぼ半円形である。窪み１２の寸法は
適宜定めることができる（本実施例では例えば幅が約１
００μｍ、長さが約３００μｍ、深さが約３０μｍであ
る）。しかし、深さは一般に、５μｍ〜０．２ｍｍであ
ることが望ましい。窪み１２と成形面１１の境の部分は
滑らかに接続するように形成されていることが好ましい
（図２参照）。Outside the effective diameter r of the lens, a plurality of intermittent (discontinuous) depressions 12 (four in this embodiment) are formed on the molding surface 11 according to the present invention. The depressions 12 are arranged at equal intervals along a circumference having a diameter K (for example, 26 mmφ). The depression 12 of the present embodiment is elongated in the circumferential direction, and has a substantially semicircular cross section as shown in FIG. The size of the depression 12 can be appropriately determined (in this embodiment, for example, the width is about 1
00 μm, about 300 μm in length and about 30 μm in depth). However, it is generally desirable that the depth be between 5 μm and 0.2 mm. It is preferable that the boundary between the recess 12 and the molding surface 11 is formed so as to be smoothly connected (see FIG. 2).
【００１２】この窪み１２にはレンズ成形時にガラスが
入り込み、このガラス突起部分が、レンズ収縮時に、成
形型との収縮量の差によって、窪み１２から乗り上げる
ため、窪み１２，１２の間の部分において成形用型１０
の成形面１１とガラスの被成形面の間に隙間が形成され
る。従って、この隙間から内側（型またはレンズの中央
側）へ空気が入るため、レンズは成形用型１０から容易
に離型される。The glass enters into the recess 12 during molding of the lens, and the glass projection rises up from the recess 12 due to the difference in the amount of shrinkage from the mold when the lens contracts. Mold 10
A gap is formed between the molding surface 11 and the glass molding surface. Therefore, since air enters inside (the center side of the mold or the lens) from this gap, the lens is easily released from the molding die 10.
【００１３】次に、上記実施例のレンズ成形用型１０に
よるレンズの成形について説明する。この実施例では、
成形用型１０としては炭化タングステン（ＷＣ；Ｃｏ）
焼結体をＨＩＰ処理し、成形面１１を鏡面に加工したも
のを用いた。その熱膨張係数は５０×１０-7／℃であ
る。成形用型１０とその窪み１２の寸法は上記において
例示した通りであった。被成形ガラス素材は重フリント
系光学ガラスのＳＦ１１を使用した。このガラスの転移
点（Ｔｇ）は４３５℃、屈伏点（Ｔｓ）は４７０℃、熱
膨張係数は９３×１０-7／℃（ただし、１００〜３００
℃において）である。Next, molding of the lens by the lens molding die 10 of the above embodiment will be described. In this example,
Tungsten carbide (WC; Co) as the molding die 10
The sintered body was subjected to HIP treatment, and the molding surface 11 was processed into a mirror surface. Its coefficient of thermal expansion is 50 × 10 −7 / ° C. The dimensions of the molding die 10 and the depressions 12 thereof were as exemplified above. The glass material to be molded was SF11, a heavy flint optical glass. This glass has a transition point (Tg) of 435 ° C., a yield point (Ts) of 470 ° C., and a coefficient of thermal expansion of 93 × 10 −7 / ° C. (100 to 300 ° C.).
(In ° C).
【００１４】窒素雰囲気中にある成形用型１０の上型と
下型の間に被成形ガラス素材（ゴブ）をセットし、そし
て成形用型１０と被成形ガラス素材を加熱および均熱化
し、被成形ガラス素材を軟化させた後に、５０７℃（ガ
ラス粘度１０8.5 ポアズに相当する）の温度で、１００
ｋｇ／ｃｍ2 の圧力により６０秒間プレスした。このと
きの成形用型１０（上型１０ａ，下型１０ｂ）とガラス
１３の状態を図３に示す。この場合、成形用型１０とガ
ラス１３は互いに密着し、窪み１２内にもガラス１３が
入り込んでいる。A glass material to be molded (gob) is set between an upper mold and a lower mold in a nitrogen atmosphere, and the molding mold 10 and the glass material to be molded are heated and soaked to form a mold. After softening the shaped glass material, at a temperature of 507 ° C. (corresponding to a glass viscosity of 10 8.5 poise),
Pressing was performed with a pressure of kg / cm 2 for 60 seconds. FIG. 3 shows the state of the molding die 10 (upper die 10a, lower die 10b) and glass 13 at this time. In this case, the molding die 10 and the glass 13 are in close contact with each other, and the glass 13 also enters the recess 12.
【００１５】しかる後に、プレス力を減圧して成形用型
１０と共にガラス１３を３００℃まで冷却した。この場
合、約４５６℃（１０11ポアズに相当する）で固化状態
になる。上記冷却時に、ガラス１３と成形用型１０が収
縮するが、ガラス１３の熱膨張係数が成形用型１０の熱
膨張係数より大きいので、ガラス１３の曲率半径が成形
用型１０よりも小さくなり、ガラス１３と成形用型１０
との間に隙間１４，１５が生じる（図４参照）。更に、
ガラス１３が半径方向内側に向かって収縮（約８．７μ
ｍ）するので、窪み１２内に入っていたガラス突起部分
１３ａが窪み１２から乗り上げ、窪み１２，１２間の部
分において成形用型１０の成形面１１とガラス１３の被
成形面１３ｂの間に隙間が形成される。従って、この隙
間から前記隙間１４へ空気が入るため、ガラス１３は成
形用型１０から容易に離型される。Thereafter, the pressing force was reduced and the glass 13 was cooled to 300 ° C. together with the molding die 10. In this case, it becomes a solid state at about 456 ° C. (corresponding to 10 11 poise). During the cooling, the glass 13 and the molding die 10 contract, but since the thermal expansion coefficient of the glass 13 is larger than the thermal expansion coefficient of the molding die 10, the radius of curvature of the glass 13 becomes smaller than that of the molding die 10, Glass 13 and mold 10
Gaps 14 and 15 are generated between them (see FIG. 4). Furthermore,
The glass 13 shrinks radially inward (about 8.7 μm).
m), the glass projection 13a that has entered the depression 12 runs over the depression 12, and a gap is formed between the molding surface 11 of the molding die 10 and the molding surface 13b of the glass 13 between the depressions 12 and 12. Is formed. Therefore, the air enters the gap 14 from this gap, so that the glass 13 is easily released from the molding die 10.
【００１６】離型後、取り出したレンズ１３をアニール
（徐冷）し、形状精度を調べたところ、ニュートン２本
以内、アスティグマ１／２本以内で良好なレンズであっ
た。なお、本レンズ１３は後工程で、外径２５ｍｍφに
芯取りすることにより、突起部分１３ａを除去してもよ
いし、またこの突起部分１３ａがレンズ有効径ｒ（２３
ｍｍφ）の外側にあるので除去しないでそのまま使用し
てもよい。After release, the taken-out lens 13 was annealed (slowly cooled) and the shape accuracy was examined. As a result, a good lens was obtained within 2 Newtons and within 1/2 astigma. Note that the projection 13a of the present lens 13 may be removed in a later step by centering the lens to an outer diameter of 25 mmφ, or the projection 13a may have a lens effective diameter r (23).
mmφ), it may be used without removing it.
【００１７】上記の窪み１２の形状、寸法、個数および
配置構造は用途に応じて変更可能である。図５（ａ）に
窪み１２の断面形状の変形例を示す。図５（ａ）に示す
シャープな窪み１２ａは断面形状がほぼ長方形である。
この場合、収縮時の抵抗が大きくならないようにするた
めに、窪み１２の深さは５０μｍ以下であることが望ま
しい。収縮時の抵抗が大きすぎると、図５（ｂ）に示す
レンズの突起部分１３ａの矢印１６で示す部分にクラッ
クが生じやすく、またレンズの面精度に悪影響が出る。The shape, size, number and arrangement of the depressions 12 can be changed according to the application. FIG. 5A shows a modification of the cross-sectional shape of the depression 12. The sharp depression 12a shown in FIG. 5A has a substantially rectangular cross section.
In this case, the depth of the depression 12 is desirably 50 μm or less in order not to increase the resistance during contraction. If the resistance at the time of contraction is too large, cracks are likely to occur at the portion of the projection 13a of the lens shown by the arrow 16 shown in FIG. 5B, and the surface accuracy of the lens is adversely affected.
【００１８】図６の窪み１２ｂは成形用型１０の中央側
の側面が、曲面の接線に対する垂線１７に対して傾斜
し、θの角度をなしている。この角度θは５°以上が望
ましい。In the depression 12b in FIG. 6, the central side surface of the molding die 10 is inclined with respect to a perpendicular 17 to a tangent to the curved surface, and forms an angle of θ. This angle θ is desirably 5 ° or more.
【００１９】図７には放射状に８個配置された窪み１２
ｃを示している。図８は小さな円形の窪み１２ｄを示し
ている。図９（ａ）と図９（ｂ）は成形用型１０の周縁
を面取りして形成した細長い窪み１２ｅを示している。
窪み１２ｅを形成する前の成形用型１０の周縁の形は図
９（ｂ）において点線で示してある。FIG. 7 shows eight recesses 12 arranged radially.
c is shown. FIG. 8 shows a small circular depression 12d. FIGS. 9A and 9B show an elongated recess 12 e formed by chamfering the periphery of the molding die 10.
The shape of the peripheral edge of the molding die 10 before the formation of the depression 12e is indicated by a dotted line in FIG. 9B.
【００２０】更に、成形用型１０の材料は熱膨張係数が
３０〜９５×１０-7／℃のものが望ましく、上記の炭化
タングステンのほかに例えば、ＳｉＣ（熱膨張係数４０
×１０-7／℃）、Ｓｉ3Ｎ4（熱膨張係数３５×１０-7／
℃）、ＺｒＯ2 （熱膨張係数９２×１０-7／℃）、Ａｌ
2Ｏ3（熱膨張係数７８×１０-7／℃）、各種サーメット
（熱膨張係数８０〜９０×１０-7／℃）等を使用するこ
とができる。更に、被成形ガラス素材としては熱膨張係
数が６０〜１５０×１０-7／℃の各種光学ガラスを使用
することができる。The material of the molding die 10 preferably has a coefficient of thermal expansion of 30 to 95 × 10 −7 / ° C. In addition to the above-mentioned tungsten carbide, for example, SiC (coefficient of thermal expansion of 40)
× 10 -7 / ° C), Si 3 N 4 (coefficient of thermal expansion 35 × 10 -7 /
° C), ZrO 2 (coefficient of thermal expansion 92 × 10 -7 / ° C), Al
2 O 3 (coefficient of thermal expansion 78 × 10 −7 / ° C.), various cermets (coefficient of thermal expansion 80 to 90 × 10 −7 / ° C.) and the like can be used. Further, as the glass material to be molded, various optical glasses having a coefficient of thermal expansion of 60 to 150 × 10 −7 / ° C. can be used.
【００２１】以上、実施例について説明したが、本発明
は上記実施例に限定されるものではない。例えば、上記
実施例では窪みを成形用型の上型に形成したが、下型に
形成してもよい。更に、凹面のレンズの成形面に窪みを
形成したが、平面状の成形面や曲率半径の大きな凸面の
レンズの成形面に形成することができ、この場合も離型
性の点で効果がある。更に、ガラスレンズの成形用型だ
けでなく、プラスチックレンズの成形用型にも本発明を
適用することができる。Although the embodiment has been described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, the depression is formed in the upper mold, but may be formed in the lower mold. Furthermore, although a depression is formed on the molding surface of the concave lens, it can be formed on a flat molding surface or a molding surface of a convex lens having a large radius of curvature, which is also effective in terms of mold release properties. . Further, the present invention can be applied to not only a mold for forming a glass lens but also a mold for forming a plastic lens.
【００２２】[0022]
【発明の効果】以上説明したように、本発明は、レンズ
の有効径より外側において型の成形面に複数の窪みを形
成したので、レンズの収縮時に、窪み内に入っていたレ
ンズ突起部分が窪みから乗り上げ、成形用型とレンズの
間に通気用の隙間を生じ、内部への空気の流入を可能に
する。従って、レンズの離型が容易であり、かつレンズ
の面精度を損なうことがないという効果がある。As described above, according to the present invention, a plurality of depressions are formed on the molding surface of the mold outside the effective diameter of the lens. It climbs up from the depression and creates a ventilation gap between the mold and the lens, allowing air to flow into the interior. Therefore, there is an effect that the release of the lens is easy and the surface accuracy of the lens is not deteriorated.
【図１】本発明の実施例によるレンズ成形用型の成形面
を下側から見た図である。FIG. 1 is a view of a molding surface of a lens molding die according to an embodiment of the present invention as viewed from below.
【図２】図１のレンズ成形用型をII−II線に沿って切断
して示す部分拡大断面図である。FIG. 2 is a partially enlarged cross-sectional view showing the lens molding die of FIG. 1 cut along line II-II.
【図３】プレス成形直後のガラスと成形用型の状態を示
す部分拡大断面図である。FIG. 3 is a partially enlarged cross-sectional view showing a state of glass and a molding die immediately after press molding.
【図４】収縮後のガラスと成形用型の状態を示す部分拡
大断面図である。FIG. 4 is a partially enlarged cross-sectional view showing a state of the glass and the mold after shrinking.
【図５】図５（ａ）は窪みの変形例を示す部分拡大断面
図、図５（ｂ）は図５（ａ）の窪みを有する成形用型に
よって成形されたレンズの部分拡大断面図である。5 (a) is a partially enlarged sectional view showing a modified example of the depression, and FIG. 5 (b) is a partially enlarged sectional view of a lens molded by the molding die having the depression shown in FIG. 5 (a). is there.
【図６】窪みの他の変形例を示す部分拡大図である。FIG. 6 is a partially enlarged view showing another modification of the depression.
【図７】形状と配置構図が異なる窪みの変形例を示す、
レンズ成形用型の成形面を下側から見た図である。FIG. 7 shows a modified example of a depression having a different shape and arrangement composition.
It is the figure which looked at the molding surface of the lens molding die from the lower side.
【図８】形状と配置構図が異なる窪みの他の変形例を示
す、レンズ成形用型の成形面を下側から見た図である。FIG. 8 is a view showing a molding surface of a lens molding die as viewed from below, showing another modification of the depression having a different shape and arrangement composition.
【図９】図９（ａ）は形状と配置構図が異なる窪みの他
の変形例を示す、レンズ成形用型の成形面を下側から見
た図であり、図９（ｂ）は図９（ａ）の成形用型のIX−
IX線に沿った部分拡大断面図である。9 (a) is a view showing a molding surface of a lens molding die viewed from below, showing another modified example of a depression having a different shape and arrangement composition, and FIG. 9 (b) is a view showing FIG. 9 (b). IX- of the molding die of (a)
FIG. 9 is a partially enlarged cross-sectional view along the line IX.
【図１０】従来のレンズ成形用型による凸レンズの成形
状態を示す縦断面図である。FIG. 10 is a longitudinal sectional view showing a state in which a convex lens is molded by a conventional lens molding die.
【図１１】従来のレンズ成形用型による凹レンズの成形
状態を示す縦断面図である。FIG. 11 is a longitudinal sectional view showing a state in which a concave lens is molded by a conventional lens molding die.
１０…レンズ成形用型、 １０ａ…上型、 １０ｂ…下
型、 １１…成形面、１２，１２ａ，１２ｂ，１２ｃ，
１２ｄ，１２ｅ…窪み、 １３…ガラス、１３ａ…ガラ
スの突起部分、 １３ｂ…ガラスの被成形面、 １４，
１５…隙間、 １６…矢印、 １７…垂線、 Ｋ…窪み
を配置した円の直径、 Ｒ…成形用型の外径、 ｒ…レ
ンズの有効径、 θ…角度。Reference numeral 10: lens molding die, 10a: upper die, 10b: lower die, 11: molding surface, 12, 12a, 12b, 12c,
12d, 12e: depression, 13: glass, 13a: projection of glass, 13b: molding surface of glass, 14,
15: gap, 16: arrow, 17: perpendicular, K: diameter of the circle in which the depression is arranged, R: outer diameter of the mold, r: effective diameter of the lens, θ: angle.
Claims (5)
向配置される１組の型を備え、これら１組の型それぞれ
の成形面がレンズの有効径よりも大きな径を有し、か
つ、前記１組の型のうちの少なくとも一方の型がその成
形面に窪みを有し、前記の窪みが、平面視上、前記の成
形面におけるレンズの有効径よりも外側の箇所に形成さ
れており、しかも、該窪みによって形成されたレンズの
突起部分が成形後の被成形素材収縮時に該窪みの周囲の
成形面に乗り上げるような形状を有していることを特徴
とするレンズ成形用型。1. A mold having a pair of molds arranged to face each other such that a molding surface is on the inside, each molding surface of the pair of molds has a diameter larger than an effective diameter of a lens, and At least one of the molds has a depression in its molding surface, and the depression is formed at a position outside the effective diameter of the lens on the molding surface in plan view. In addition, a lens molding die characterized in that the projection of the lens formed by the depression has a shape such that it can ride on the molding surface around the depression when the material to be molded shrinks after molding.
個の窪みが断続的に形成されている、請求項１に記載の
レンズ成形用型。2. The lens molding die according to claim 1, wherein a plurality of depressions are formed intermittently in at least one of the pair of dies.
が、該窪みが形成されている箇所を除いて凸面となって
いる、請求項１または請求項２に記載のレンズ成形用
型。3. The lens molding die according to claim 1, wherein the molding surface of the mold having the depression is a convex surface except for a portion where the depression is formed.
請求項１〜請求項３のいずれか１項に記載のレンズ成形
用型。4. The depression has a depth of 5 μm to 0.2 mm.
The lens molding die according to any one of claims 1 to 3.
向配置される１組の型を備え、これら１組の型それぞれ
の成形面がレンズの有効径よりも大きな径を有している
レンズ成形用型を用いたプレス法によってレンズを製造
するにあたり、前記１組の型のうちの少なくとも一方と
して、成形面に窪みを有し、前記の窪みが、平面視上、
前記の成形面におけるレンズの有効径よりも外側の箇所
に形成されている型を用い、前記窪みによって形成され
たレンズの突起部分が成形後に起きる被成形素材の収縮
によって該窪みの周囲の成形面に乗り上げた後に離型す
ることを特徴するレンズの製造方法。5. A lens comprising a pair of dies which are arranged to face each other such that the molding surface is on the inside, and wherein the molding surface of each of the pair of dies has a diameter larger than the effective diameter of the lens. In manufacturing a lens by a pressing method using a molding die, at least one of the pair of dies has a depression in a molding surface, and the depression is, in plan view,
A mold formed at a position outside the effective diameter of the lens on the molding surface is used, and the projection portion of the lens formed by the depression is formed around the depression by shrinkage of the material to be molded after molding. A method of manufacturing a lens, comprising releasing a mold after riding on a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28251598A JP3187014B2 (en) | 1990-01-24 | 1998-10-05 | Lens mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28251598A JP3187014B2 (en) | 1990-01-24 | 1998-10-05 | Lens mold |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014282A Division JP2914508B2 (en) | 1990-01-24 | 1990-01-24 | Lens mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11189425A true JPH11189425A (en) | 1999-07-13 |
| JP3187014B2 JP3187014B2 (en) | 2001-07-11 |
Family
ID=17653464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28251598A Expired - Lifetime JP3187014B2 (en) | 1990-01-24 | 1998-10-05 | Lens mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3187014B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007010760A (en) * | 2005-06-28 | 2007-01-18 | Sumitomo Electric Ind Ltd | Method for forming resin body, method for forming structure for optical waveguide, and method for forming optical component |
| JP2010087533A (en) * | 2005-02-17 | 2010-04-15 | Asml Netherlands Bv | Imprint lithography |
| KR102880768B1 (en) * | 2025-01-14 | 2025-11-04 | (주)이.오.에스 | Contact lens peeling device for contact lens manufacturing system |
-
1998
- 1998-10-05 JP JP28251598A patent/JP3187014B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010087533A (en) * | 2005-02-17 | 2010-04-15 | Asml Netherlands Bv | Imprint lithography |
| JP2007010760A (en) * | 2005-06-28 | 2007-01-18 | Sumitomo Electric Ind Ltd | Method for forming resin body, method for forming structure for optical waveguide, and method for forming optical component |
| US8241535B2 (en) | 2005-06-28 | 2012-08-14 | Sumitomo Electric Industries, Ltd. | Method for transcribing patterns on resin body, method for manufacturing planar waveguide, and method for manufacturing micro-lens |
| KR102880768B1 (en) * | 2025-01-14 | 2025-11-04 | (주)이.오.에스 | Contact lens peeling device for contact lens manufacturing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3187014B2 (en) | 2001-07-11 |
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