JPH06263462A - Glass lens forming mold - Google Patents
Glass lens forming moldInfo
- Publication number
- JPH06263462A JPH06263462A JP7097393A JP7097393A JPH06263462A JP H06263462 A JPH06263462 A JP H06263462A JP 7097393 A JP7097393 A JP 7097393A JP 7097393 A JP7097393 A JP 7097393A JP H06263462 A JPH06263462 A JP H06263462A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- molding
- glass
- shape
- outer edge
- 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.)
- Withdrawn
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
- C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
- C03B11/086—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor of coated dies
-
- 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
- C03B2215/02—Press-mould materials
- C03B2215/08—Coated press-mould dies
- C03B2215/10—Die base materials
- C03B2215/12—Ceramics or cermets, e.g. cemented WC, Al2O3 or TiC
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/02—Press-mould materials
- C03B2215/08—Coated press-mould dies
- C03B2215/14—Die top coat materials, e.g. materials for the glass-contacting layers
- C03B2215/20—Oxide ceramics
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガラス光学素子の成形
型に係り、特に凸面形状のレンズ面を有するガラスレン
ズを成形するのに好適なガラスレンズ成形型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass optical element molding die, and more particularly to a glass lens molding die suitable for molding a glass lens having a convex lens surface.
【０００２】[0002]
【従来の技術】近年、一対の成形型でガラス素材を直接
プレス成形することにより、その後の冷間での研削・研
磨を不要にし、所望の光学性能を満足する光学ガラスレ
ンズを得る成形方法が盛んに用いられている。ところ
が、この成形方法においては、高温下で、ガラス素材を
球面・非球面形状からなる成形型によりプレス成形した
後、常温まで降温してガラスレンズを取り出すため、ガ
ラス成形面に熱応力が生じる場合には、脆性的性質を有
するガラスレンズは応力集中および熱応力から割れてし
まうことがある。2. Description of the Related Art In recent years, there has been proposed a molding method in which a glass material is directly press-molded by a pair of molding dies, thereby eliminating the need for subsequent cold grinding and polishing and obtaining an optical glass lens satisfying desired optical performance. It is used extensively. However, in this molding method, when the glass material is pressed at a high temperature with a mold having a spherical / aspherical shape and then cooled to room temperature to take out the glass lens, when the glass molding surface is subjected to thermal stress. In particular, brittle glass lenses can crack from stress concentration and thermal stress.
【０００３】そこで、従来、上記欠点を解決するため
に、例えば特公平３−５２４１７号公報に開示されるよ
うな成形型が提案されている。この成形型は、型の曲面
加工部（レンズ加工部）とこの曲面加工部の外方に位置
する平面加工部との境界部に面取りを施したものであ
る。Therefore, in order to solve the above-mentioned drawbacks, a molding die disclosed in, for example, Japanese Patent Publication No. 3-52417 has been proposed. In this molding die, a boundary portion between a curved surface processing portion (lens processing portion) and a flat surface processing portion located outside the curved surface processing portion is chamfered.
【０００４】[0004]
【発明が解決しようとする課題】特公平３−５２４１７
号公報においては、曲面加工部と平面加工部との間に鋭
い角がないため、型自体が損傷を受けにくいとともに、
被成形ガラスレンズにもそのような角が転写されず、著
しい応力集中の防止から割れが防止される効果が記載さ
れている。[Problems to be Solved by the Invention] Japanese Patent Publication No. 3-52417
In the publication, since there is no sharp corner between the curved surface processing portion and the flat surface processing portion, the mold itself is less likely to be damaged, and
It is described that such a corner is not transferred to the glass lens to be molded, and the effect of preventing cracking from the prevention of remarkable stress concentration.
【０００５】しかしながら、凹形状のレンズ加工部を有
する型を用い、かつ成形用素材として平面形状のプリフ
ォームを用いる場合、この平面形状プリフォームは、上
下型間に挟持されてプレス成形されるが、前記上下型
は、いずれも外周部には平面部が形成されており、プレ
ス成形時最初にその型平面部が平面プリフォームに接触
する。一般に、ガラスレンズの成形においては、上記平
面プリフォームは軟化点以上に加熱される一方、成形型
はガラス転移点近くの温度を有し、プレス成形時、その
熱交換によって平面プリフォームが型に形成されたレン
ズ加工部に沿って流動することでレンズ面が形成される
が、特公平３−５２４１７号公報に記載された成形型で
は、型外周に形成された平面加工部の面積が大きいため
に、加熱軟化された平面プリフォームの外周部から熱が
型平面加工部に逃げ、その部分が最初に固化してしま
う。However, when a mold having a concave lens processing portion is used and a planar preform is used as a molding material, the planar preform is sandwiched between the upper and lower molds and press-molded. In each of the upper and lower molds, a flat surface portion is formed on the outer peripheral portion, and the flat surface portion of the mold first comes into contact with the flat surface preform during press molding. Generally, in the molding of glass lenses, the above-mentioned flat preform is heated above its softening point, while the molding die has a temperature near the glass transition point. The lens surface is formed by flowing along the formed lens processed portion, but in the molding die described in Japanese Patent Publication No. 3-52417, the area of the flat processed portion formed on the outer periphery of the die is large. In addition, heat escapes from the outer peripheral portion of the heat-softened flat surface preform to the mold flat surface processing portion, and that portion is solidified first.
【０００６】そのため、上記従来の成形型では、ガラス
素材がレンズ加工部のすべてに流動することを阻害する
とともに、プレス時、高圧力で強引に流動させようとす
ると、ガラス素材の外周部に引張り応力が作用し、割れ
が生じてしまうという欠点があった。また、ガラス素材
の流動性を向上させるために、型温やプリフォーム温度
を非常に高くすると、成形型の寿命が著しく短くなって
しまうという問題があった。Therefore, in the above-mentioned conventional molding die, the glass material is prevented from flowing to all the lens processed parts, and when the glass material is forced to flow with high pressure at the time of pressing, it is pulled to the outer peripheral portion of the glass material. There is a drawback that stress acts and cracks occur. Further, if the mold temperature and the preform temperature are made extremely high in order to improve the fluidity of the glass material, there is a problem that the life of the molding die is significantly shortened.
【０００７】本発明は、かかる従来の問題点に鑑みてな
されたもので、光学ガラスレンズを成形するにあたり、
特に成形素材に平面ガラス素材を用いるとともに、型が
凹面（成形レンズは凸面形状になる）のレンズ加工部を
有する際、極めて流動性良く、割れ等の欠損を防止し、
精密な転写を図ることができるガラスレンズ成形型を提
供することを目的とする。The present invention has been made in view of the above conventional problems, and in forming an optical glass lens,
Especially when a flat glass material is used as the molding material, and the mold has a concave lens processing part (the molded lens has a convex shape), it has extremely good fluidity and prevents cracks and other defects.
It is an object of the present invention to provide a glass lens molding die capable of achieving precise transfer.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、加熱軟化されたガラス素材を押圧し、所
望の光学面が形成された一対の成形面を上記ガラス素材
に転写するガラスレンズ成形型において、レンズ加工部
と該レンズ加工部外から成形型最外周までの外縁部に連
続かつ滑らかなる曲面縁部を有し、前記レンズ加工部と
曲面縁部とを連続的な曲線で結んで形成した。すなわ
ち、本発明は、凹形状のレンズ加工部を有するガラスレ
ンズ成形型のプリフォーム接触面全体が、球面・非球面
のレンズ加工部と連続かつ滑らかにつながれた曲線やテ
ーパで最外周まで形成せしめ、平面プリフォームが成形
初期にレンズ加工部外に形成された曲線の頂点部に接触
するような形状に構成したものである。In order to solve the above problems, the present invention presses a heat-softened glass material to transfer a pair of molding surfaces having desired optical surfaces to the glass material. In a glass lens molding die, a lens processing part and a curved edge which is continuous and smooth at an outer edge portion from the outside of the lens processing part to the outermost periphery of the molding die, and the lens processing part and the curved edge are continuous curves. Formed by tying in. That is, according to the present invention, the entire preform contact surface of the glass lens molding die having the concave lens processing portion is formed to the outermost circumference by a curve or taper continuously and smoothly connected to the spherical or aspherical lens processing portion. The flat preform is configured so as to come into contact with the apex of a curve formed outside the lens processing portion at the initial stage of molding.
【０００９】[0009]
【作用】軟化点以上に加熱軟化された平面形状を有する
プリフォーム（ガラス素材）は、外周まで滑らかにかつ
連続的につながれた曲線形状を有し、転移点温度近くに
加熱された本発明の上下型間に搬送され、押圧される。
その時、平面プリフォームは、外周部に形成された山状
の頂点部に接した後、極めて小さな抵抗で、型中心部の
レンズ加工部および最外周に流動する。そのため、深い
凹形状を有するレンズ加工部（レンズ面の曲率が大きい
もの）であっても、大きな流動量が得られ、外周部が固
化する前にレンズ加工部のすべてにガラス素材を流動さ
せることができる。The preform (glass material) having a planar shape that has been softened by heating above the softening point has a curved shape that is smoothly and continuously connected to the outer circumference, and is heated near the transition point temperature of the present invention. It is conveyed between the upper and lower molds and pressed.
At that time, the flat preform, after contacting the mountain-shaped apex portion formed on the outer peripheral portion, flows to the lens-processed portion at the center of the mold and the outermost periphery with extremely small resistance. Therefore, even if the lens processing part has a deep concave shape (the curvature of the lens surface is large), a large flow amount can be obtained, and the glass material should be made to flow to all the lens processing parts before the outer peripheral part solidifies. You can
【００１０】[0010]
【実施例１】本発明の実施例１を図１および図２に基づ
いて説明する。 ［構成］本実施例のガラスレンズ成形型は、図１に示す
ようなもので、Ａｌ2 Ｏ3 基材１上にＣｒ2 Ｏ3 材２を
焼結結合して形成されている。Ｃｒ2 Ｏ3 材２の表面
は、所望の光学形状（非球面・球面等）に形成されたレ
ンズ加工部３と、このレンズ加工部３から最外周まで連
続かつ滑らかなる曲面縁部で断面が起伏した形状を有す
る外縁部４とからなり、両者の境界部は滑らかに曲線で
連続的につながっている。成形型の外縁部４は、断面が
Ｒ形状となるように仕上げられているので、外縁部４の
先端部にはリング状に稜線が形成されている。よって、
成形型にてガラス素材を押圧する際、ガラス素材と最初
に接触するのは、成形型の外縁部４の先端部に形成され
たリング状の稜線である。[Embodiment 1] Embodiment 1 of the present invention will be described with reference to FIGS. [Structure] The glass lens mold of this example is as shown in FIG. 1, and is formed by sintering and bonding a Cr 2 O 3 material 2 on an Al 2 O 3 base material 1. The surface of the Cr 2 O 3 material 2 has a lens processing portion 3 formed in a desired optical shape (aspherical surface, spherical surface, etc.) and a curved edge which is continuous and smooth from the lens processing portion 3 to the outermost periphery. The outer edge portion 4 has an undulating shape, and the boundary portion between them is smoothly and continuously connected by a curved line. Since the outer edge portion 4 of the molding die is finished so as to have an R-shaped cross section, a ring-shaped ridge line is formed at the tip of the outer edge portion 4. Therefore,
When the glass material is pressed by the forming die, the first contact with the glass material is the ring-shaped ridge line formed at the tip of the outer edge portion 4 of the forming die.
【００１１】上記レンズ加工部３と外縁部４とは、超精
密研削加工により同時に形成され、さらに光学部品とし
ての性能を満足するようにレンズ加工部３は鏡面を有す
るように研磨加工が施されるのと同時に、Ｃｒ2 Ｏ3 材
２に介在されているＴｉ・Ｚｒ等の添加物が研削加工時
に生じる内部クラックから析出しないように、外縁部４
も研磨されている。また、成形型の最外周エッジ部はＲ
面取りが施され、外縁部４と連続的な面になっている。The lens processing portion 3 and the outer edge portion 4 are simultaneously formed by ultra-precision grinding, and the lens processing portion 3 is polished to have a mirror surface so as to satisfy the performance as an optical component. At the same time, the outer edge portion 4 is formed so that additives such as Ti and Zr that are present in the Cr 2 O 3 material 2 do not precipitate from internal cracks generated during grinding.
Is also polished. The outermost peripheral edge of the mold is R
It is chamfered to form a continuous surface with the outer edge portion 4.
【００１２】［作用］本実施例の成形型５、６は、図２
に示すように、成形機に設置された押圧可能な上型およ
び下型マウント部７、８に対向して固持される。これら
上下の成形型５、６間には、搬送アーム９により加熱炉
１０内を通過し加熱軟化された平板形状の光学ガラス素
材からなるプリフォーム１１が、胴型１２内に保持さ
れ、素材の軟化点近くに昇温された後、該搬送アーム９
によって、上下の成形型５、６間に搬送、停止される。
また、成形型（下型）６の外周には、胴型１２の位置決
めを行うために、位置決めリング１３が外装されてお
り、胴型１２に嵌合できるようになっている。[Operation] The molding dies 5 and 6 of this embodiment are shown in FIG.
As shown in FIG. 3, the upper mold and the lower mold mounts 7 and 8 installed on the molding machine are fixed so as to face each other. Between the upper and lower molds 5 and 6, a preform 11 made of a flat plate-shaped optical glass material, which has been heated and softened by passing through the heating furnace 10 by the transfer arm 9, is held in the body mold 12 and After the temperature is raised to near the softening point, the transfer arm 9
Thus, the upper and lower molds 5 and 6 are conveyed and stopped.
Further, a positioning ring 13 is provided on the outer periphery of the molding die (lower die) 6 for positioning the body die 12, so that the body 12 can be fitted with the positioning ring 13.
【００１３】図３は成形過程の説明図である。平板形状
のプリフォーム１１は、上下の成形型５、６間に挟持さ
れて押圧される時、平板形状のプリフォーム１１と成形
型５、６とが最初に接触するのは、外縁部４の起伏部の
頂点部であり、成形型５、６で押圧されるのに伴って、
軟化されたプリフォーム１１は滑らかに形成された外縁
部４に沿って、抵抗なくスムーズにその表面は流動す
る。ここに、成形開始直後の成形型５、６と平板形状の
プリフォ−ム１１との接触は、線接触となる。成形型
５、６とプリフォ−ム１１との接触後、プリフォ−ム１
１がレンズ加工部３に接触するまで、成形型５、６によ
るプリフォ−ム１１の押圧を続行する。プリフォ−ム１
１がレンズ加工部３に接触するまでの間は、プリフォ−
ム１１と成形型５、６との接触は線接触のままとなる。FIG. 3 is an explanatory view of the molding process. When the flat plate-shaped preform 11 is sandwiched between the upper and lower molds 5 and 6 and pressed, the flat plate-shaped preform 11 and the molds 5 and 6 first contact with each other at the outer edge portion 4. It is the apex of the undulation, and as it is pressed by the molding dies 5 and 6,
The surface of the softened preform 11 smoothly flows without resistance along the smoothly formed outer edge portion 4. Here, the contact between the molding dies 5 and 6 and the flat plate-shaped preform 11 immediately after the start of molding is line contact. After contacting the forming dies 5 and 6 with the preform 11, the preform 1
The pressing of the preform 11 by the molding dies 5 and 6 is continued until 1 contacts the lens processing portion 3. Preform 1
Before the 1 touches the lens processing part 3,
The contact between the drum 11 and the molding dies 5 and 6 remains linear contact.
【００１４】成形時、プリフォ−ム１１の一部は型外周
に流動するが、大きな流動が得られるために、レンズ加
工部３の空隙部を平板形状のプリフォーム１１の流動ガ
ラスによって埋めることができ、さらに成形圧力を保持
したままで成形型５、６およびプリフォーム１１を冷却
することにより、レンズ加工部３の表面が転写されたガ
ラスレンズを成形することができる。At the time of molding, a part of the preform 11 flows to the outer periphery of the mold, but since a large flow can be obtained, it is possible to fill the voids of the lens processing part 3 with the flowable glass of the flat plate-shaped preform 11. Further, by cooling the molding dies 5 and 6 and the preform 11 while maintaining the molding pressure, it is possible to mold the glass lens having the surface of the lens processing portion 3 transferred.
【００１５】［効果］本実施例の成形型５、６を用い
て、図２および図３に示した成形装置で従来成形型と成
形比較した。レンズ形状は両面凸形状で片面が非球面で
あり、ガラス素材（プリフォ−ム１１）はＢＫ−７（シ
ョット名）を用いた。非球面形状は、レンズ加工部３の
直径：深さが約１：１という、流動を確保することが困
難な形状であり、その上レンズ外周のコバ厚が０．４ｍ
ｍという、偏肉も大きなレンズである。[Effect] Using the molding dies 5 and 6 of this embodiment, a molding apparatus shown in FIGS. 2 and 3 was used for molding comparison with a conventional molding die. The lens shape was convex on both sides and one side was aspherical, and BK-7 (shot name) was used as the glass material (preform 11). The aspherical shape has a diameter: depth of the lens processing portion 3 of about 1: 1 and is a shape in which it is difficult to ensure flow, and the edge thickness of the lens outer periphery is 0.4 m.
The lens has a large thickness deviation, m.
【００１６】従来の成形型では押圧時に最外周の平面部
が固化してしまい、転写どころかレンズ加工部に軟化さ
れたガラス素材が充填されず、成形時の押圧力を上げる
と外周部が割れてしまい、全く成形することができなか
った。これに対し、本実施例の成形型５、６では、同様
の素材・形状のレンズを成形したところ、コバ厚０．４
ｍｍ以下まで押圧することができ、ガラスの流動も問題
なく、レンズ加工部３にガラス素材を充填することがで
き、成形されたレンズの面精度も０．３μｍ以下という
実用上全く問題のないレベルであった。In the conventional molding die, the outermost flat surface portion is solidified at the time of pressing, so that the lens processing portion is not filled with the softened glass material, and the outer peripheral portion is cracked when the pressing force during molding is increased. It could not be molded at all. On the other hand, in the molding dies 5 and 6 of the present example, when lenses of the same material and shape were molded, the edge thickness was 0.4
It can be pressed up to mm or less, there is no problem with the flow of glass, the lens processing part 3 can be filled with glass material, and the surface accuracy of the molded lens is 0.3 μm or less, which is a level with no practical problems Met.
【００１７】以上のように、本実施例の成形型５、６に
よると、ガラス素材（プリフォ−ム１１）と成形型５、
６との接触が線接触のまま、すなわち、ガラス素材と成
形型５、６との間の抵抗が小さいまま成形型５、６によ
る押圧を進めることができるので、成形時に、ガラス素
材に対して大きな流動量を与えることができ、凸レンズ
の成形に際し、平板形状のプリフォームを容易に変形さ
せるとともに流動させることが可能になる。As described above, according to the molding dies 5 and 6 of this embodiment, the glass material (preform 11) and the molding dies 5 and 6 are used.
Since the contact between the glass material and the molding material 6 is linear contact, that is, the pressing force of the molding material 5, 6 can be advanced while the resistance between the glass material and the molding material 5, 6 is small, A large amount of flow can be given, and it becomes possible to easily deform and flow the flat plate-shaped preform when forming the convex lens.
【００１８】[0018]
【実施例２】 ［構成］本発明の実施例２を図４に示す。本実施例で
は、成形型のレンズ加工部３外方にある外縁部４の外側
はテーパー形状に形成されており、レンズ加工部３と外
縁部４の内側とは、曲面部によって滑らかでかつ連続的
な面となるように形成されている。外縁部４の先端部は
Ｒ形状でリング状に稜線が形成されていることは、前記
実施例１と同様である。また、成形型の素材は、ＷＣ
（タングステン・カーバイト）であり、成形面には離型
性をよくし、焼き付きを防止するために、薄膜コートが
施されている。Second Embodiment [Structure] A second embodiment of the present invention is shown in FIG. In the present embodiment, the outer side of the outer edge portion 4 outside the lens processing portion 3 of the molding die is formed in a taper shape, and the lens processing portion 3 and the inner edge portion 4 are smooth and continuous due to the curved surface portion. It is formed so as to be a transparent surface. As in the first embodiment, the tip of the outer edge portion 4 is R-shaped and the ridge line is formed in a ring shape. The material of the mold is WC
(Tungsten carbide), the molding surface is coated with a thin film to improve releasability and prevent seizure.
【００１９】［作用］本実施例の作用も全く実施例１と
同様であるが、成形型の最外周がテーパー形状に形成さ
れているので、押圧時に極めて小さい抵抗力で大流動量
を得ることができる。[Operation] The operation of this embodiment is exactly the same as that of Embodiment 1, but since the outermost periphery of the molding die is formed in a tapered shape, it is possible to obtain a large flow amount with an extremely small resistance force at the time of pressing. You can
【００２０】［効果］図２に示す装置で同じく従来の成
形型と比較した。レンズ外径がφ２５ｍｍ、ガラス素材
がＳＫ−１１（ショット名）のレンズ成形を行った結
果、従来の成形型では、ガラス素材がレンズ加工部内に
流動したものの、０．４ｍｍのコバ厚まで押圧すること
ができず、所望のレンズを得ることができなかった。[Effect] The apparatus shown in FIG. 2 was compared with a conventional molding die. As a result of molding a lens with an outer diameter of 25 mm and a glass material of SK-11 (shot name), the conventional molding die pressed the glass material to 0.4 mm even though the glass material flowed into the lens processing part. It was not possible to obtain the desired lens.
【００２１】これに対し、本実施例の成形型においては
容易に成形することができ、良好な面精度を得つつ、コ
バ厚０．４ｍｍという薄肉部までレンズを形成すること
ができた。On the other hand, with the molding die of this embodiment, molding can be performed easily, and a lens can be formed up to a thin portion of edge thickness 0.4 mm while obtaining good surface accuracy.
【００２２】[0022]
【発明の効果】以上のように、本発明のガラスレンズ成
形型によれば、凹形状のレンズ加工部を有する成形型を
用い、加熱軟化された平面形状のプリフォームをプレス
成形した際、該平面プリフォームの表面は抵抗なくガラ
スが流動し、凹形状のレンズ加工部内まで容易に軟化ガ
ラスが充填され、大きく変形した光学レンズの成形が可
能となる。また、ガラス流動の際の抵抗が小さいことか
ら、型温・プリフォーム温度を低く設定することがで
き、型の寿命を長期化することができる。さらに、成形
されたレンズの外縁部への応力集中も防止でき、割れ・
欠け等の発生も抑制され極めて品質の良いガラスレンズ
を安定して得ることができる。As described above, according to the glass lens mold of the present invention, when a heat-softened planar preform is press-molded using a mold having a concave lens processing portion, The glass flows without resistance on the surface of the flat preform, and the softened glass is easily filled into the concave lens processing portion, so that a greatly deformed optical lens can be molded. In addition, since the resistance during glass flow is small, the mold temperature and the preform temperature can be set low, and the life of the mold can be extended. In addition, stress concentration on the outer edge of the molded lens can be prevented and cracks and
Occurrence of chips and the like is also suppressed, and a glass lens of extremely high quality can be stably obtained.
【図１】本発明の実施例１のガラスレンズ成形型を示す
正面図である。FIG. 1 is a front view showing a glass lens mold of Example 1 of the present invention.
【図２】実施例１の成形型を具備した成形装置を示す概
略構成図である。FIG. 2 is a schematic configuration diagram showing a molding apparatus equipped with the molding die of Example 1.
【図３】実施例１の成形型を具備した成形装置を示す概
略構成図である。FIG. 3 is a schematic configuration diagram showing a molding apparatus equipped with the molding die of Example 1.
【図４】本発明の実施例２のガラスレンズ成形型を示す
正面図である。FIG. 4 is a front view showing a glass lens mold of Example 2 of the present invention.
１ Ａｌ2 Ｏ3 基材 ２ Ｃｒ2 Ｏ3 材 ３ レンズ加工部 ４ 外縁部1 Al 2 O 3 base material 2 Cr 2 O 3 material 3 lens processing part 4 outer edge part
Claims (1)
望の光学面が形成された一対の成形面を上記ガラス素材
に転写するガラスレンズ成形型において、レンズ加工部
と該レンズ加工部外から成形型最外周までの外縁部に連
続かつ滑らかなる曲面縁部を有し、前記レンズ加工部と
曲面縁部とを連続的な曲線で結んで形成したことを特徴
とするガラスレンズ成形型。1. A glass lens mold for pressing a heated and softened glass material to transfer a pair of molding surfaces having desired optical surfaces to the glass material, from a lens processing part and from outside the lens processing part. A glass lens molding die having a continuous and smooth curved surface edge portion up to the outermost periphery of the molding die, wherein the lens processing portion and the curved surface edge portion are connected by a continuous curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7097393A JPH06263462A (en) | 1993-03-05 | 1993-03-05 | Glass lens forming mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7097393A JPH06263462A (en) | 1993-03-05 | 1993-03-05 | Glass lens forming mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06263462A true JPH06263462A (en) | 1994-09-20 |
Family
ID=13446978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7097393A Withdrawn JPH06263462A (en) | 1993-03-05 | 1993-03-05 | Glass lens forming mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06263462A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108315A1 (en) * | 2004-05-10 | 2005-11-17 | Konica Minolta Opto, Inc. | Optical glass element and manufacturing method thereof |
| WO2010055763A1 (en) * | 2008-11-13 | 2010-05-20 | 住友電気工業株式会社 | Member for forming element, method of manufacturing element, and element |
| JP2011048337A (en) * | 2009-07-23 | 2011-03-10 | Panasonic Corp | Optical element |
-
1993
- 1993-03-05 JP JP7097393A patent/JPH06263462A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005108315A1 (en) * | 2004-05-10 | 2005-11-17 | Konica Minolta Opto, Inc. | Optical glass element and manufacturing method thereof |
| US7415842B2 (en) | 2004-05-10 | 2008-08-26 | Konica Minolta Opto, Inc. | Optical glass element and manufacturing method thereof |
| WO2010055763A1 (en) * | 2008-11-13 | 2010-05-20 | 住友電気工業株式会社 | Member for forming element, method of manufacturing element, and element |
| JPWO2010055763A1 (en) * | 2008-11-13 | 2012-04-12 | 住友電気工業株式会社 | Element forming member, element manufacturing method, and element |
| JP2011048337A (en) * | 2009-07-23 | 2011-03-10 | Panasonic Corp | Optical element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000509 |