JPH06144852A - Apparatus for forming optical element and method for forming optical element - Google Patents
Apparatus for forming optical element and method for forming optical elementInfo
- Publication number
- JPH06144852A JPH06144852A JP30202092A JP30202092A JPH06144852A JP H06144852 A JPH06144852 A JP H06144852A JP 30202092 A JP30202092 A JP 30202092A JP 30202092 A JP30202092 A JP 30202092A JP H06144852 A JPH06144852 A JP H06144852A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- optical element
- heating
- die
- molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光学機器に使用される
光学素子を精密ガラス成形法により形成する成形装置及
び光学素子の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 a molding apparatus for molding an optical element used in an optical device by a precision glass molding method and a molding method for the optical element.
【０００２】[0002]
【従来の技術】近年、光学レンズ等を研磨工程なしの一
発成形によって得る試みが多くなされ、現在、各社では
量産段階にある。ガラス素材を一定の形状に予備加工し
てこれを成形型の間に供給し、加熱、押圧成形するのが
一般的な成形方法である。2. Description of the Related Art In recent years, many attempts have been made to obtain optical lenses and the like by one-shot molding without a polishing step, and at present, each company is in a mass production stage. It is a general molding method that a glass material is preliminarily processed into a predetermined shape, and the glass material is supplied between molding dies and heated and pressed.
【０００３】図１は、従来例の一つであり上型１、下型
２、胴型３で構成される成形型内にガラス素材４を収容
した後、これら全体をヒーター５を内蔵した上下の加熱
板６の間に配置しガラス素材４が軟化する温度まで加熱
した後、上加熱板６を介してエアーシリンダーなどを用
いいたプレスヘッド（図示せず）で図中Ｚ方向に押圧、
変形させた後ヒーターの電源を切り上記成形型全体を冷
却させて成形されたレンズを取り出す。FIG. 1 is one of the conventional examples, in which a glass material 4 is housed in a molding die composed of an upper die 1, a lower die 2 and a body die 3, and then the whole of the glass material 4 is built in a heater 5 in a vertical direction. Placed between the heating plates 6 and heated to a temperature at which the glass material 4 softens, and then pressed in the Z direction in the drawing by a press head (not shown) using an air cylinder or the like via the upper heating plate 6.
After the deformation, the heater is turned off and the entire mold is cooled to take out the molded lens.
【０００４】しかし、上述したような成形では得られた
レンズ表面にしばしばくもりが発生する課題を有する。
このくもりはレンズの透過率、レンズ表面にコートされ
る蒸着膜の密着力を低下させ光学特性、信頼性において
改善が望まれていた。さらに、上下の成形型表面にもガ
ラス素材からの飛散物が付着し、成形毎に型表面のメン
テを行う煩雑な作業を伴い生産性の観点からも改善が望
まれていた。However, the above-mentioned molding has a problem that clouding often occurs on the obtained lens surface.
This haze reduces the transmittance of the lens and the adhesion of the vapor deposition film coated on the lens surface, and improvements in optical characteristics and reliability have been desired. Further, scattered matters from the glass material adhere to the surfaces of the upper and lower molds, and there is a need for improvement from the viewpoint of productivity, which involves complicated work of maintaining the mold surface for each molding.
【０００５】さらに特開平１ー１６７２３９号公報で
は、成形型とガラス素材をパレット上に別々に載置し、
これら全体を加熱することによってガラス素材からの飛
散物を予め飛散させ型表面に付着することを抑え、成形
型の長寿命化と成形されたレンズの品質を改善するのが
主旨である。Further, in JP-A-1-167239, a molding die and a glass material are separately placed on a pallet,
The main purpose of this is to prevent the scattered material from the glass material from being scattered in advance to adhere to the surface of the mold by heating all of them, thereby prolonging the life of the mold and improving the quality of the molded lens.
【０００６】[0006]
【発明が解決しようとする課題】しかし、上記した成形
装置においては成形型、ガラス素材、パレット全体を均
一に加熱する必要があり、必然的に大きな加熱手段を必
要とする。また、成形される温度範囲の高温下において
複雑かつ精密な位置決め制御と組立制御が必要である。
さらに均熱加熱されたガラス素材を吸着フィンガーによ
り成形型内に投入する手段がとられているため、ガラス
素材表面の温度分布が不均一になり、結果的には成形レ
ンズの性能をばらつかせることになると考えられる。However, in the above-mentioned molding apparatus, it is necessary to uniformly heat the molding die, the glass material, and the pallet, which inevitably requires a large heating means. In addition, complicated and precise positioning control and assembly control are required at high temperatures in the molding temperature range.
Furthermore, since the means for introducing the uniformly heated glass material into the molding die with the suction fingers is used, the temperature distribution on the surface of the glass material becomes non-uniform, and as a result, the performance of the molded lens varies. I think that will be the case.
【０００７】本発明は、上記した課題に鑑み特にレンズ
表面のくもりの発生を抑えることを目的とした光学素子
の成形装置と同装置を用いた光学素子の製造方法を提供
するものである。In view of the above-mentioned problems, the present invention provides an optical element molding apparatus and an optical element manufacturing method using the same, for the purpose of suppressing the occurrence of clouding on the lens surface.
【０００８】[0008]
【課題を解決するための手段】本発明は、胴型および該
胴型に収容されたガラス素材と上下型とで構成される成
形型の上下に当接する加熱板と該加熱板のうちどちらか
一方が上下動自在なプレス軸とを備えた構成の成形装置
において、前記上加熱板に上型のみをホールドする機構
を備えたことを特徴とする光学素子の成形装置とするこ
とで解決の手段とする。According to the present invention, there is provided one of a heating plate and a heating plate which come into contact with the upper and lower sides of a mold including a barrel mold, a glass material housed in the barrel mold and an upper and lower mold. A molding apparatus having a structure in which one of them is provided with a vertically movable press shaft, wherein a mechanism for holding only the upper mold is provided on the upper heating plate to provide a molding device for an optical element. And
【０００９】さらに本発明は、胴型および該胴型に収容
されたガラス素材と上下型とを組み立て成形型とする工
程と、該成形型を加熱する工程と、前記加熱途中に前記
上型を胴型より引き抜く工程と、再び前記上型を前記胴
型に収容させ押圧変形する工程と変形完了後、取り出し
可能な温度まで冷却する光学素子の製造方法で解決の手
段とする。Further, according to the present invention, a step of assembling a barrel mold, a glass material housed in the barrel mold and an upper and lower mold into a molding die, a step of heating the molding die, and a step of heating the upper die during the heating. The steps of withdrawing from the barrel die, the step of accommodating the upper die again in the barrel die and the pressing deformation, and the method of manufacturing an optical element for cooling to a temperature at which the upper die can be taken out after completion of the deformation are means for solving.
【００１０】[0010]
【作用】前記光学素子の成形装置は、上加熱板に上型の
ホールド機構を備えているために成形型の加熱途中で成
形型の分解および組立に作用する。また、上型の分解時
にはガラス素材からの飛散物を型外に排除することに作
用し、組立時はガラス素材を押圧、変形するのに作用す
る。したがって、成形されたレンズ表面のくもりの発生
を抑制するのに作用する。これによりレンズ成形の歩留
まりを向上させ、しいては、安価で精度の高い光学素子
を提供することが可能になる。In the optical element molding apparatus, since the upper heating plate is provided with the upper die holding mechanism, it acts on the disassembly and assembly of the molding die during the heating of the molding die. In addition, when the upper mold is disassembled, it works to remove scattered materials from the glass material to the outside of the mold, and when assembling, it works to press and deform the glass material. Therefore, it acts to suppress the occurrence of clouding on the surface of the molded lens. This makes it possible to improve the yield of lens molding, and thus to provide an inexpensive and highly accurate optical element.
【００１１】[0011]
（実施例１）以下、本発明の光学素子の成形装置および
同装置を用いた製造方法の一実施例について図１を参照
しながら詳細に説明する。(Embodiment 1) Hereinafter, an embodiment of an optical element molding apparatus of the present invention and a manufacturing method using the same will be described in detail with reference to FIG.
【００１２】図１は、本発明における光学素子の成形装
置を示す縦断面図であり、図１（ａ）は上型１、下型
２、胴型３、で作られた空間にガラス素材４を収容した
成形型の状態を示し、かつヒーター５を内蔵した上下の
加熱板６が上下型に接触する状態にセットし、ヒーター
５の電源を入れ上下の加熱板６の加熱を開始する。上加
熱板６は上面のシリンダー７と連結され、上下自在に可
動できるまた、上加熱板６の下面中心には吸着口８が設
けられており、吸着口８は吸着装置９（図示せず）に連
通されている。FIG. 1 is a longitudinal sectional view showing an optical element molding apparatus according to the present invention. FIG. 1A shows a glass material 4 in a space formed by an upper mold 1, a lower mold 2 and a body mold 3. Is set to a state in which the upper and lower heating plates 6 containing the heater 5 are in contact with the upper and lower molds, the heater 5 is turned on, and heating of the upper and lower heating plates 6 is started. The upper heating plate 6 is connected to the cylinder 7 on the upper surface and can be moved freely in the vertical direction. Further, a suction port 8 is provided at the center of the lower surface of the upper heating plate 6, and the suction port 8 is a suction device 9 (not shown). Is in communication with.
【００１３】同図（ｂ）は成形型の加熱途中に上型１を
上加熱板６に吸着させると同時に図中Ｚ方向にシリンダ
ー７を用いて上昇させる。この時、上下の加熱板は加熱
を続行する。ここで上型１を胴型３より上昇した理由
は、ガラス素材４からの飛散物を容易に型外に排除する
ことが最大の目的である。また、上型１を上昇させるタ
イミングはガラス素材の種類、すなわち、ガラス素材中
に含まれる蒸気圧力の高いものが何であるかによって決
定される。また、下加熱板６上に残された下型２および
胴型３の位置は動くことはない。In FIG. 1B, the upper mold 1 is adsorbed to the upper heating plate 6 while the mold is being heated, and at the same time, the cylinder 7 is moved up in the Z direction in the drawing. At this time, the upper and lower heating plates continue to be heated. The reason why the upper mold 1 is elevated above the barrel mold 3 is that the scattered objects from the glass material 4 can be easily removed from the mold outside the mold. The timing of raising the upper mold 1 is determined by the type of glass material, that is, what is contained in the glass material and has a high vapor pressure. Further, the positions of the lower mold 2 and the barrel mold 3 left on the lower heating plate 6 do not move.
【００１４】同図（ｃ）はガラス素材が充分軟化された
状態で再びシリンダー７を下降させ上型１を胴型３に収
容し、そのまま押圧変形をおこなう。変形完了後、吸着
装置９による吸引を止めた後、シリンダー７を上昇させ
成形型全体を冷却させた後、成形型からレンズを取り出
して成形を完了する。In FIG. 1C, the cylinder 7 is lowered again while the glass material is sufficiently softened, the upper mold 1 is accommodated in the barrel mold 3, and the pressing deformation is performed as it is. After the deformation is completed, the suction by the suction device 9 is stopped, the cylinder 7 is raised to cool the entire molding die, and then the lens is taken out from the molding die to complete the molding.
【００１５】（実施例２）実施例１で説明した順序にし
たがって、本発明における成形装置を用いて、実際に光
学素子の製造方法を説明する。(Embodiment 2) A method for actually manufacturing an optical element will be described using the molding apparatus of the present invention in the order described in Embodiment 1.
【００１６】成形面に光学機能面を有する上型１と下型
２と胴型３で作られた空間にボール形状でＳＦ８（鉛系
ガラス）を収容し、その成形型を上下加熱板の間に置
き、上加熱板６を上型に接触するように降下させ、その
後、ヒーター５の電源を投入した。加熱板温度が約４０
０℃になったところで上型を上昇させ、加熱板温度が５
２０℃になるまで加熱を続けた。次に、１００Ｋｇｆの
荷重で加圧し、成形を行い、冷却した後成形されたレン
ズを取り出した。得られたレンズをフィゾー型干渉計を
用い透過波面収差を測定したところ、ＲＭＳで０．０４
λ以下の性能を得ることを確認した。この性能は充分実
用に供せるものである。SF8 (lead glass) in the shape of a ball is housed in the space formed by the upper die 1, the lower die 2 and the body die 3 having an optical function surface on the molding surface, and the molding die is placed between the upper and lower heating plates. Then, the upper heating plate 6 was lowered so as to come into contact with the upper mold, and then the heater 5 was turned on. Heating plate temperature is about 40
When the temperature reaches 0 ° C, the upper mold is raised and the heating plate temperature is 5
Heating was continued until it reached 20 ° C. Next, pressure was applied with a load of 100 Kgf to perform molding, and after cooling, the molded lens was taken out. When the transmitted wavefront aberration of the obtained lens was measured using a Fizeau interferometer, it was 0.04 by RMS.
It was confirmed that a performance of λ or less was obtained. This performance is sufficiently practical.
【００１７】尚、本実施例で４００℃で上型を持ち上げ
たがこれは、鉛系ガラスでは４００℃から徐々に鉛の発
散が開始する実験結果によるものである。さらに上型の
みを持ち上げる理由は、飛散物の型への付着のほとんど
が上型に起こるためである。また、吸着を止めるタイミ
ングは、本実施例ではガラス素材変形完了後に行った
が、上型が胴型に収容される初期段階でもかまわない。In this embodiment, the upper mold was lifted at 400 ° C. This is due to the experimental result that lead emission gradually starts at 400 ° C. in the lead-based glass. Further, the reason why only the upper mold is lifted is that most of the scattered matter attached to the mold occurs on the upper mold. Further, in the present embodiment, the timing of stopping the suction is after the completion of the deformation of the glass material, but the timing may be the initial stage when the upper mold is housed in the barrel mold.
【００１８】[0018]
【発明の効果】以上から明かなように、本発明によれ
ば、加熱された時に素材から飛び出る飛散物による成形
型の汚れや成形されたレンズのくもりの発生を防止でき
る。また加熱された成形型を加熱板により分解、組立を
行うので、いちいち成形型の組立時に同心軸合わせを行
うことが不要となり、最も簡単な構造で精密な位置決め
精度と組立制御を実現できるものである。しかも分解組
立時においても加熱が続行されているため、この間の放
熱のロスを最小限に抑えることができ、一層安定した光
学素子の製造を行うことに効果がある。As is apparent from the above, according to the present invention, it is possible to prevent the formation of stains on the molding die and the clouding of the molded lens due to the flying particles flying out of the material when heated. In addition, since the heated mold is disassembled and assembled by the heating plate, it is not necessary to perform concentric axis alignment at the time of assembling the mold, and it is possible to realize precise positioning accuracy and assembly control with the simplest structure. is there. In addition, since heating is continued even during disassembly and assembly, the loss of heat radiation during this period can be minimized, which is effective in manufacturing a more stable optical element.
【図１】本発明の光学素子の製造方法を示す工程図FIG. 1 is a process diagram showing a method for manufacturing an optical element of the present invention.
【図２】従来の光学素子の製造方法の説明図FIG. 2 is an explanatory view of a conventional method for manufacturing an optical element.
１ 上型 ２ 下型 ３ 胴型 ４ ガラス素材 ５ ヒーター ６ 加熱板 ７ シリンダー ８ 吸着口 ９ 吸着装置 1 Upper mold 2 Lower mold 3 Body 4 Glass material 5 Heater 6 Heating plate 7 Cylinder 8 Adsorption port 9 Adsorption device
Claims (3)
と上下型とで構成される成形型の上下に当接する加熱板
と、該加熱板のうちどちらか一方が上下動自在なプレス
軸とを備えた構成の成形装置において、前記上加熱板に
前記上型をホールドする機構を備えたことを特徴とする
光学素子の成形装置。1. A heating plate which is in contact with the upper and lower sides of a barrel die, a glass die housed in the barrel die and an upper die and a lower die, and one of the heating plates is vertically movable. An optical element molding apparatus comprising a shaft and a mechanism for holding the upper mold on the upper heating plate.
着口と該吸着口と外部に連通する吸着装置を備えたこと
を特徴とする請求項１記載の光学素子の成形装置。2. The apparatus for molding an optical element according to claim 1, wherein the upper mold holding mechanism includes a suction port provided on the upper heating plate and a suction device communicating with the suction port to the outside.
と上下型とを組み合わせ成形型とする工程と、該成形型
を加熱する工程と、前記加熱途中に前記上型を前記胴型
より所定時間引き抜く工程と、前記上型を再び前記胴型
に収容して押圧変形する工程と、変形完了後前記ガラス
素材の取り出し可能な温度まで冷却することを特徴とす
る光学素子の成形方法。3. A body mold, a step of forming a mold by combining a glass material housed in the body mold and an upper and lower mold, a step of heating the mold, and a step of heating the upper mold to the body mold during the heating. A method for molding an optical element, comprising a step of pulling out for a predetermined period of time, a step of accommodating the upper mold again in the barrel mold and deforming by pressure, and cooling to a temperature at which the glass material can be taken out after the completion of deformation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30202092A JPH06144852A (en) | 1992-11-12 | 1992-11-12 | Apparatus for forming optical element and method for forming optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30202092A JPH06144852A (en) | 1992-11-12 | 1992-11-12 | Apparatus for forming optical element and method for forming optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06144852A true JPH06144852A (en) | 1994-05-24 |
Family
ID=17903935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30202092A Pending JPH06144852A (en) | 1992-11-12 | 1992-11-12 | Apparatus for forming optical element and method for forming optical element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06144852A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5805361A (en) * | 1995-07-18 | 1998-09-08 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical element molding die, and method of molding the optical element |
-
1992
- 1992-11-12 JP JP30202092A patent/JPH06144852A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5805361A (en) * | 1995-07-18 | 1998-09-08 | Matsushita Electric Industrial Co., Ltd. | Optical element, optical element molding die, and method of molding the optical element |
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