JPH0729788B2 - Method for manufacturing optical glass element - Google Patents
Method for manufacturing optical glass elementInfo
- Publication number
- JPH0729788B2 JPH0729788B2 JP24869687A JP24869687A JPH0729788B2 JP H0729788 B2 JPH0729788 B2 JP H0729788B2 JP 24869687 A JP24869687 A JP 24869687A JP 24869687 A JP24869687 A JP 24869687A JP H0729788 B2 JPH0729788 B2 JP H0729788B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- optical glass
- press
- carbide
- glass element
- 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
- C03B11/12—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
- 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
- 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
- C03B2215/22—Non-oxide ceramics
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physical Vapour Deposition (AREA)
- Chemical Vapour Deposition (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は光学ガラス素子の製造方法に関し、プレス成形
後、磨き工程等を必要としない光学ガラス素子の直接プ
レス成形に関するものである。TECHNICAL FIELD The present invention relates to a method for manufacturing an optical glass element, and more particularly to direct press molding of an optical glass element that does not require a polishing step after press molding.
従来の技術 近年、光学ガラスレンズは光学機器のレンズ構成の簡略
化とレンズ部分の軽量化の両方を同時に達成し得る非球
面化の傾向にある。この非球面レンズの製造には従来の
光学ガラスレンズの製造方法である研摩法では加工性お
よび量産性に劣り、直接プレス成形により製造する方法
が有望視されている。2. Description of the Related Art In recent years, optical glass lenses have tended to be aspherical surfaces that can achieve both simplification of the lens structure of optical equipment and weight reduction of the lens portion at the same time. In order to manufacture this aspherical lens, the conventional polishing method which is a manufacturing method of an optical glass lens is inferior in workability and mass productivity, and a method of manufacturing by direct press molding is considered promising.
以上のような光学ガラス素子のプレス成形用型として高
温でも安定で、耐酸化性に優れ、ガラスに対して不活性
であり、高圧にも耐えるような機械的強度の優れ、さら
には加工性に優れ精密加工ができなくてはならない材料
が必要となっている。従来の光学ガラス素子のプレス成
形用型としては特開昭52-45613号公報ではシリコンカー
バイド（SiC）またはシリコンナイトライド（Si3N4）が
用いられ、さらに特開昭59-121126号公報ではチタンカ
ーバイド（TiN）および金属の混合材料が用いられてい
る。As a mold for press molding of optical glass elements as described above, it is stable at high temperatures, has excellent oxidation resistance, is inert to glass, has excellent mechanical strength that can withstand high pressure, and has excellent workability. Materials that must be capable of excellent precision processing are needed. As a conventional press-molding die for an optical glass element, in JP-A-52-45613, silicon carbide (SiC) or silicon nitride (Si 3 N 4 ) is used, and in JP-A-59-121126. A mixed material of titanium carbide (TiN) and metal is used.
発明が解決しようとする問題点 しかしながら、従来の型材料では上記の条件を全て満足
するものは得られていない。例えば、型材料としてSiC
およびSi3N4を用いた場合では、非常に硬く機械的強度
が優れているが、加工性に劣り、さらには光学ガラス素
子の構成成分である鉛（Pb）やアルカリ元素と反応し易
いという欠点を有している。また、TiCおよび金属の混
合材料の場合も光学ガラス素子と反応し易く、型材料と
しては不適当である。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, conventional mold materials have not been obtained which satisfy all the above conditions. For example, SiC as a mold material
If and using Si 3 N 4 is very hard mechanical strength is excellent, poor workability, and further that it is easy to react with lead (Pb) or alkali element is a component of an optical glass element It has drawbacks. Further, a mixed material of TiC and metal is also unsuitable as a mold material because it easily reacts with the optical glass element.
以上のように、従来の型材料では前述の型材料としての
必要条件を全て満足するには至っていない。従って、型
寿命が短く、高精度な光学ガラス素子をプレス成形によ
って大量に生産することはできない。As described above, the conventional mold material does not satisfy all the above-mentioned necessary conditions as the mold material. Therefore, it is not possible to mass-produce high-precision optical glass elements having a short mold life by press molding.
本発明では上記問題点に鑑み、直接プレス成形法による
光学性能の良い高精度な光学ガラス素子を大量に成形す
ることを可能にするためのプレス成形用型を提供するこ
とを目的としている。In view of the above problems, it is an object of the present invention to provide a press-molding die that enables a large amount of high-precision optical glass elements with good optical performance to be molded by a direct press-molding method.
問題点を解決するための手段 上記問題点を解決するために、本発明では加工性が良く
機械的強度が優れたWCを主成分とする超硬合金あるいは
各種サーメットをプレス成形用型の母材として、そのプ
レス面にHfC、ThC2、ZrCまたはNbCの薄膜を形成した型
を作製し、この型を用いることによって光学性能の良い
高精度な光学ガラス素子を大量にプレス成形することを
可能にしたものである。Means for Solving the Problems In order to solve the above problems, in the present invention, a base material of a press-molding die for cemented carbide or various cermets containing WC as a main component, which has good workability and excellent mechanical strength. As a result, a mold in which a thin film of HfC, ThC 2 , ZrC or NbC is formed on the press surface is produced, and by using this mold, it is possible to press-mold a large amount of high-precision optical glass elements with good optical performance. It was done.
作用 本発明は上記した構成によって、従来の型材料では実現
できなかった前記の必要条件を全て満足した型を得るこ
とができ、この型を用いることによって大量に光学ガラ
ス素子を直接プレスして成形することが可能となる。Effect The present invention can obtain a mold satisfying all the above-mentioned necessary conditions which cannot be realized by the conventional mold material by the above-mentioned constitution, and by using this mold, a large amount of optical glass elements are directly pressed and molded. It becomes possible to do.
実施例 以下、本発明の一実施例を図面を用いて説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
直径20mm、厚さ6mmのWCを主成分とする超硬合金を曲率
半径がそれぞれ46mmおよび200mmの凹面形状のプレス面
を有する上下の型からなる一対の光学ガラス素子のプレ
ス成形用型に加工した。これらの型のプレス面を超微細
なダイヤモンド低粒を用いて鏡面に研摩した。次に、こ
の鏡面上に適当な方法により５μｍの厚みでHfC、Th
C2、ZrCまたはNbCの薄膜をコーティングしてプレス成形
用型を作製した。WC-based cemented carbide with a diameter of 20 mm and a thickness of 6 mm was processed into a pair of optical glass element press-molding dies consisting of upper and lower dies having concave press faces with radii of curvature of 46 mm and 200 mm, respectively. . The press surfaces of these molds were mirror-polished with ultrafine diamond grains. Next, HfC and Th with a thickness of 5 μm are formed on this mirror surface by an appropriate method.
To prepare a mold for press molding by coating a thin film of C 2, ZrC or NbC.
このようにして作製した型の断面図を第１図に示す。第
１図において、11は母材、12はプレス面上にコーティン
グしたHfC、ThC2、ZrCまたはNbCの薄膜である。A cross-sectional view of the mold thus manufactured is shown in FIG. In FIG. 1, 11 is a base material and 12 is a thin film of HfC, ThC 2 , ZrC or NbC coated on the press surface.
これらの型を第２図に示したプレス成形機にセットす
る。第２図において、21は上型用固定ブロック、22は上
型用加熱ヒーター、23は上型、24はガラス素子、25は下
型、26は下型用加熱ヒーター、27は下型用固定ブロッ
ク、28は上型用熱電対、29は下型用熱電対、210はプラ
ンジャー、211は位置決め用センサー、212はストッパ
ー、213は覆いである。These molds are set in the press molding machine shown in FIG. In FIG. 2, 21 is an upper die fixing block, 22 is an upper die heating heater, 23 is an upper die, 24 is a glass element, 25 is a lower die, 26 is a lower die heating heater, and 27 is a lower die fixing. Block, 28 is an upper mold thermocouple, 29 is a lower mold thermocouple, 210 is a plunger, 211 is a positioning sensor, 212 is a stopper, and 213 is a cover.
次に、酸化鉛（PbO）70重量％、シリカ（SiO）27重量％
および残りが微量成分からなる酸化鉛系光学ガラスを半
径10mmの球状に加工したガラス素子24を上下の型23およ
び25の下型25の上に置き、その上に上型を置き、そのま
ま520℃まで昇温し、窒素雰囲気で約40kg/cm2のプレス
圧によりプレスして２分間保持し、その後、そのままの
状態で上下の型を300℃まで冷却して、プレス成形され
た光学ガラス素子を取り出して、光学ガラス素子のプレ
ス成形の工程を完了する。Next, lead oxide (PbO) 70% by weight, silica (SiO) 27% by weight
And a glass element 24, which is obtained by processing a lead oxide-based optical glass consisting of trace components with a radius of 10 mm into a spherical shape with a radius of 10 mm, is placed on the lower mold 25 of the upper and lower molds 23 and 25, and the upper mold is placed thereon, and the temperature is 520 ° C. The temperature is raised to about 40 kg / cm 2 in a nitrogen atmosphere and held for 2 minutes, then the upper and lower molds are cooled to 300 ° C. in that state to obtain a press-molded optical glass element. Then, the process of press molding the optical glass element is completed.
以上の工程を繰り返して1000回目のプレス終了時に、上
下の型23および25をプレス成形機より取りはずして、プ
レス面の状態を光学顕微鏡で観察し、その時のプレス面
の表面粗さ（RMS値、Å）を測定して、それぞれの型精
度を評価した。さらに、比較実験として、従来使用され
ていた炭化ケイ素（SiC）焼結体およびSi3N4焼結体の型
を作製し、第２図に示したプレス成形機にセットし、上
述の光学ガラス素子のプレス成形の工程を1000回繰り返
し行い、同様の型精度の評価を行った。When the 1000th press is completed by repeating the above steps, the upper and lower molds 23 and 25 are removed from the press molding machine, the state of the press surface is observed with an optical microscope, and the surface roughness of the press surface at that time (RMS value, Å) was measured and the mold precision of each was evaluated. Further, as a comparative experiment, molds of conventionally used silicon carbide (SiC) sintered body and Si 3 N 4 sintered body were prepared and set in the press molding machine shown in FIG. The element press molding process was repeated 1000 times, and the same mold precision was evaluated.
本発明の型を用いたプレス試験の結果を第１表に示し、
比較の為の型を用いたプレス試験の結果を第２表に示し
た。The results of the press test using the mold of the present invention are shown in Table 1,
The results of the press test using the mold for comparison are shown in Table 2.
第２表、試料No.5および６の従来使用されているSiC焼
結体およびSi3N4焼結体を用いた型においては、数回ガ
ラスをプレスしただけで型とガラスが反応し、プレス面
にガラスが付着し、全く使用することができなくなっ
た。 In the mold using the conventionally used SiC sintered body and Si 3 N 4 sintered body of Table 2 and sample Nos. 5 and 6, the mold and the glass react with each other only by pressing the glass several times, The glass adhered to the press surface and could not be used at all.
以上の比較試料に対して、第１表から明らかなように、
本発明の型、すなわち、WCを主成分とした超硬合金を母
材とし、そのプレス面にHfC、ThC2、ZrCまたはNbCの薄
膜をコーティングして構成される型を用いると、1000回
プレスした時でも、表面粗さはほとんどプレス前と変化
がなく、型寿命が著しく延び、高精度な光学ガラス素子
を大量にプレス成形することが可能となった。For the above comparative samples, as is apparent from Table 1,
The mold of the present invention, that is, a mold composed of a cemented carbide containing WC as a base material and a press surface thereof coated with a thin film of HfC, ThC 2 , ZrC or NbC is pressed 1000 times. Even when it was done, the surface roughness was almost unchanged from that before pressing, the mold life was remarkably extended, and it became possible to press-mold a large amount of highly accurate optical glass elements.
このように、本発明の型は前述した高精度な光学ガラス
素子を直接プレス成形するための必要条件を全て満足
し、従来のものに比べて著しく型寿命が延び、高精度な
光学ガラス素子を大量にプレス成形することが可能とな
った。As described above, the mold of the present invention satisfies all the above-mentioned requirements for directly press-molding a high-precision optical glass element, has a significantly longer mold life than conventional ones, and provides a high-precision optical glass element. It became possible to press-mold a large amount.
なお、本発明を説明するために、実施例においてプレス
成形用型の母材としてWCを主成分とする超硬合金を用い
た型を例に挙げたが、TiNあるいはTiCを主成分とするサ
ーメットを母材とし、そのプレス面にHfC、ThC2、ZrCま
たはNbCの薄膜をコーティングして構成される型を用い
ても、同様に型寿命が延び、高精度な光学ガラス素子の
量産化が可能となった。In order to explain the present invention, a mold using a cemented carbide containing WC as a main component was given as an example in the examples of the base material of the press forming mold, but a cermet containing TiN or TiC as a main component was used. Even when using a mold that is made by using as a base material and coating the press surface with a thin film of HfC, ThC 2 , ZrC, or NbC, the mold life is similarly extended, and high-precision optical glass elements can be mass-produced. Became.
発明の効果 以上のように、本発明は光学ガラス素子のプレス成形用
型を作製するにあたり、母材として超硬合金およびサー
メットを用い、そのプレス面にHfC、ThC2、ZrCまたはNb
Cの薄膜をコーティングすることによって、前述した型
材料としての必要条件を全て満足した光学ガラス素子の
プレス成形用型を提供したものであり、高精度な光学ガ
ラス素子を安価に、かつ、大量に製造するために、極め
て有用な発明である。As described above, in the present invention, in producing a press-molding die for an optical glass element, cemented carbide and cermet are used as a base material, and HfC, ThC 2 , ZrC or Nb is applied to the press surface.
By coating a thin film of C, we have provided a press molding die for optical glass elements that satisfies all the requirements for the die material described above.High precision optical glass elements can be produced inexpensively and in large quantities. It is an extremely useful invention for manufacturing.
第１図は本発明の光学ガラス素子のプレス成形用型の断
面の概略図、第２図実施例における光学ガラス素子のプ
レス成形用型を組み込んだプレス成形機の概略図であ
る。 11……プレス面上にコーティングしたHfC、ThC2、ZrCま
たはNbCの薄膜、12……母材。FIG. 1 is a schematic view of a cross section of a press molding die for an optical glass element of the present invention, and a schematic view of a press molding machine incorporating the press molding die for an optical glass element in the embodiment of FIG. 11 …… HfC, ThC 2 , ZrC or NbC thin film coated on the press surface, 12 …… Base material.
Claims (1)
硬合金あるいは炭化チタン（TiC）または窒化チタン（T
iN）を主成分とするサーメットを母材とし、そのプレス
面上に炭化ハフニウム（HfC）、炭化ナトリウム（Th
C2）、炭化ジルコニウム（ZrC）または炭化ニオブ（Nb
C）の薄膜を形成した型を用いてプレス成形することを
特徴とする光学ガラス素子の製造方法。1. A cemented carbide containing tungsten carbide (WC) as a main component, titanium carbide (TiC), or titanium nitride (T).
iN) as the base material, with hafnium carbide (HfC) and sodium carbide (Thf) on the pressed surface.
C 2 ), zirconium carbide (ZrC) or niobium carbide (Nb
A method for producing an optical glass element, which comprises press-molding using a mold having a thin film formed in C).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24869687A JPH0729788B2 (en) | 1987-10-01 | 1987-10-01 | Method for manufacturing optical glass element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24869687A JPH0729788B2 (en) | 1987-10-01 | 1987-10-01 | Method for manufacturing optical glass element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0193430A JPH0193430A (en) | 1989-04-12 |
| JPH0729788B2 true JPH0729788B2 (en) | 1995-04-05 |
Family
ID=17181973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24869687A Expired - Fee Related JPH0729788B2 (en) | 1987-10-01 | 1987-10-01 | Method for manufacturing optical glass element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729788B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988000928A1 (en) * | 1986-08-07 | 1988-02-11 | Ppg Industries, Inc. | Calcium hypochlorite compositions |
-
1987
- 1987-10-01 JP JP24869687A patent/JPH0729788B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988000928A1 (en) * | 1986-08-07 | 1988-02-11 | Ppg Industries, Inc. | Calcium hypochlorite compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0193430A (en) | 1989-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |