JPH0521854B2 - - Google Patents

Info

Publication number
JPH0521854B2
JPH0521854B2 JP2205394A JP20539490A JPH0521854B2 JP H0521854 B2 JPH0521854 B2 JP H0521854B2 JP 2205394 A JP2205394 A JP 2205394A JP 20539490 A JP20539490 A JP 20539490A JP H0521854 B2 JPH0521854 B2 JP H0521854B2
Authority
JP
Japan
Prior art keywords
molding
mold
optical
optical element
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 - Lifetime
Application number
JP2205394A
Other languages
Japanese (ja)
Other versions
JPH03228835A (en
Inventor
Kenzo Matsuzaka
Nobuo Nakamura
Seitaro Okano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP20539490A priority Critical patent/JPH03228835A/en
Publication of JPH03228835A publication Critical patent/JPH03228835A/en
Publication of JPH0521854B2 publication Critical patent/JPH0521854B2/ja
Granted legal-status Critical Current

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
    • C03B11/125—Cooling
    • 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
    • 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
    • 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
    • C03B2215/05—Press-mould die materials
    • C03B2215/07—Ceramic or cermets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/66—Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room

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)
  • Glass Compositions (AREA)

Description

【発明の詳細な説明】 本発明は光学素子の成形方法に関するものであ
る。レンズ、プリズム、フイルターなどの光学素
子は従来、多くはガラスの研摩処理によつて製造
されている。しかし研摩処理には相当な時間と技
能を要するものである。また、非球面レンズを研
摩処理で製造するには一層硬度の研摩技術が必要
でまた処理時間も長くならざるを得ないものであ
る。このような研摩処理による光学素子の製造方
法に対して、加熱加圧による成形によつて光学素
子を製造する方法がある。この成形方法によれ
ば、短時間に光学素子を製造することができ、ま
た、非球面レンズも球面レンズと同じように容易
且つ短時間に製造することができるものである
が、加熱加圧による成形方法においてもなお改善
されるべき問題点がある。それは、光学素子とし
て必要な表面精度を有する光学素子を型で作るの
は容易でなかつたことおよび成形後に光学素子を
支障なく型から離型するには、充分長い冷却時間
をとらねばならないと考えられていたことであ
る。即ち、従来、この型としてはグラフアイトか
ら形成されたものが多く使用されてきたが、グラ
フアイト製造を用いた場合には、良好な表面精度
を有する光学ガラス素子を製造することができな
かつた。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding an optical element. Conventionally, many optical elements such as lenses, prisms, and filters are manufactured by polishing glass. However, the polishing process requires considerable time and skill. Furthermore, manufacturing an aspherical lens by polishing requires a polishing technique that is even harder, and also requires a longer processing time. In contrast to such a method of manufacturing an optical element by polishing, there is a method of manufacturing an optical element by molding by heating and pressing. According to this molding method, optical elements can be manufactured in a short time, and aspherical lenses can also be manufactured easily and in a short time in the same way as spherical lenses. There are still problems that need to be improved in the molding method. This was because it was not easy to mold an optical element with the surface precision necessary for an optical element, and in order to release the optical element from the mold without any problems after molding, a sufficiently long cooling time had to be allowed. This is what was being done. That is, conventionally, molds made of graphite have often been used, but when using graphite manufacturing, it has been impossible to manufacture optical glass elements with good surface precision. .

また、ガラス成形用の金型の成形表面に炭化タ
ングステンとコバルトを主成分とする材料を溶射
して表面被覆を形成したものも提案されたが、こ
のような金型においては成形表面に存在している
コバルト粒子がガラス中の鉛と反応し鉛を析出さ
せて最終レンズ製品の性能に悪影響を与える。ま
た、成形用型の成形表面に傷を生じ、これが次の
レンズ成形時にレンズに転移されて、不良品を生
じる恐れがある。 It has also been proposed to thermally spray a material mainly composed of tungsten carbide and cobalt onto the molding surface of a mold for glass molding to form a surface coating; The cobalt particles in the glass react with the lead in the glass, precipitating lead and negatively impacting the performance of the final lens product. In addition, there is a risk that scratches may occur on the molding surface of the molding die, which may be transferred to the lens during subsequent lens molding, resulting in defective products.

本発明を実施するに当つて使用する光学素子の
成形用型として、炭化タングステンとコバルトを
主成分とし且つ炭化タングステン100重量部に対
して少なくともコバルト３〜６重量部を含む材料
を型部材の形状に焼結成形し、さらに、これに熱
間静圧プレス処理（HIP処理）を加えて、炭化タ
ングステンが緻密に配置された成形表面を形成し
たものを使用することができる。このような成形
用型を使用することによつて、加熱加圧により高
い表面精度を有する光学素子を製造することがで
きる。前述のように、光学素子をつくる型とし
て、従来、グラフアイトから形成されたものが多
く使用されているが、グラフアイトは多孔性であ
るために、いかに研摩しても、光学素子として充
分な表面精度をもつ素子につくるに充分な表面粗
さの内壁表面をもつ型を得ることができなかつた
が、上記した炭化タングステンおよびコバルトを
主成分とする成形用型を使用することによつて、
表面粗さRmax5／100μｍ以下の内壁表面をもつ
型を得ることができ、且つこのような表面粗さに
正確に対応する表面精度をもつ光学素子をつくる
ことができる。従つて、上記成形用型の内壁の表
面粗さは、通常Rmax5／100μｍ以下、特には
Rmax3／100μｍ以下に設定されたものが好適で
ある。このような高い表面精度を有する型とし
て、炭化タングステンとコバルトの焼結体の表面
に高い圧力をかけて表面に表面精度に支障となる
ようなポア（巣）がない状態にし、さらに研摩し
て製造したものが好適である。型を形成する炭化
タングステンとコバルトの組成比は適宜設定され
るが、炭化タングステン100重量部に対して、コ
バルトは３〜６部の範囲が好適である。また必要
に応じてニツケルなどの他の成分を適宜加えても
よい。 As a mold for molding an optical element used in carrying out the present invention, a material containing tungsten carbide and cobalt as main components and containing at least 3 to 6 parts by weight of cobalt per 100 parts by weight of tungsten carbide is used to form a mold member. It is possible to use a material that is sintered and shaped, and then subjected to hot isostatic pressing treatment (HIP treatment) to form a molded surface in which tungsten carbide is densely arranged. By using such a molding die, it is possible to manufacture an optical element with high surface precision by heating and pressing. As mentioned above, molds made from graphite have traditionally been widely used as molds for making optical elements, but because graphite is porous, no matter how much it is polished, it cannot be used as an optical element. Although it was not possible to obtain a mold with an inner wall surface rough enough to make an element with surface precision, by using the above-mentioned molding mold mainly composed of tungsten carbide and cobalt,
It is possible to obtain a mold having an inner wall surface with a surface roughness of Rmax5/100 μm or less, and to produce an optical element having a surface precision that accurately corresponds to such surface roughness. Therefore, the surface roughness of the inner wall of the above-mentioned mold is usually Rmax5/100μm or less, especially
It is preferable to set the value to Rmax3/100 μm or less. In order to create a mold with such high surface precision, high pressure is applied to the surface of the sintered body of tungsten carbide and cobalt to make the surface free of pores that would impede surface precision, and then the surface is polished. The manufactured one is suitable. The composition ratio of tungsten carbide and cobalt forming the mold is set as appropriate, but a range of 3 to 6 parts of cobalt is suitable for 100 parts by weight of tungsten carbide. Further, other components such as nickel may be added as appropriate.

このように、炭化タングステンにコバルトを加
えることによつて、より緻密で且つ高温において
形状変化を生じない型を得ることができる。然し
て、炭化タングステンおよびコバルトを主成分と
する材料は、線膨張係数が５×10-6でフリント系
光学ガルス（SF14）の8.2×10-6より小さくいわ
ゆる焼きじめが起こらないこと、ガラスが型にく
つつかないこと（離型性良）、熱伝導度がセラミ
ツクスに比べ高いこと（0.91cal／sec／cal）硬度
が高く（Hv1500）耐久性が優れていること、及
び前述した高い鏡面性が得られること、という利
点を有している。 In this way, by adding cobalt to tungsten carbide, it is possible to obtain a mold that is denser and does not change shape at high temperatures. However, materials whose main components are tungsten carbide and cobalt have a coefficient of linear expansion of 5 x 10 -6 , which is smaller than 8.2 x 10 -6 of flint-based optical glass (SF14), and that so-called burning does not occur. It does not stick to the mold (good mold releasability), has higher thermal conductivity than ceramics (0.91 cal/sec/cal), has high hardness (Hv1500), and has excellent durability, and the high specularity mentioned above. It has the advantage of being able to obtain

以上の説明された成形用型によつて加熱加圧に
より成形された光学素子は後研摩が不要で、その
まま光学素子としてい用いることができるもので
ある。また成形工程である、加熱加圧条件は使用
する各種ガラスやMgF2、CaF2、TiO2、ZnSなど
の結晶材料の種類によつて適宜設定されるが、ガ
ラスの場合には加圧の際のガラスの温度は、ガラ
ス転移点以上である。型に収容する前に予め加熱
しておいてもよいし、型に収容後に型と共に加熱
しても良い。 The optical element molded by heat and pressure using the mold described above does not require post-polishing and can be used as an optical element as it is. In addition, the heating and pressurizing conditions in the forming process are appropriately set depending on the type of glass used and the type of crystalline material such as MgF 2 , CaF 2 , TiO 2 , ZnS, etc.; The temperature of the glass is above the glass transition point. It may be heated in advance before being placed in the mold, or it may be heated together with the mold after being placed in the mold.

然して、加熱によつて酸化を生ずるのを防止す
るために、この成形工程は、真空中または窒素ガ
ス、ヘリウム等の不活性雰囲気中にて行なうのが
よい。 However, in order to prevent oxidation from occurring due to heating, this molding step is preferably carried out in a vacuum or in an inert atmosphere such as nitrogen gas or helium.

ところで、以上に説明したような光学レンズの
機能面に形成する成形表面を有する成形用型に光
学ガラスを入れ、前記の光学ガラスおよび型部材
を加熱・加圧し前記型部材の成形表面を前記光学
ガラスの表面に転写することによつてレンズを成
形するに当つて、従来成形後に光学素子を支障な
く型から離型するには、充分に長い冷却時間をと
らねばらないと考えられていたのであるが、この
ように充分長い冷却時間をとることにすると成形
による光学素子の生産性を損ずるという問題点が
ある。 By the way, an optical glass is placed in a mold having a molding surface to be formed on the functional surface of an optical lens as described above, and the optical glass and the mold member are heated and pressurized so that the molding surface of the mold member becomes the optical lens. When molding lenses by transferring them onto the surface of glass, it was previously thought that a sufficiently long cooling time had to be taken in order to release the optical element from the mold without any problems after molding. However, if such a sufficiently long cooling time is taken, there is a problem that the productivity of optical elements by molding will be impaired.

本発明は、上記の問題点に鑑みてなされたもの
で、その要旨は、光学ガラスを光学レンズの機能
面に形成する成形表面を有する成形用型に入れ、
前記の光学ガラスおよび型部材を加熱・加圧し前
記型部材の成形表面を前記光学ガラスの表面に転
写することによつてレンズを成形する光学素子の
成形方法において、前記光学ガラスの所定の加圧
温度に達した後に加圧を行ない、その後、前記光
学ガラスが転移点以下になるまでは第一次冷却速
度にしたがつて冷却し、その後、前記第一次冷却
速度より速度を増した第二次冷却速度にしたがつ
て冷却するようにしたことを特徴とする光学素子
の成形方法にある。 The present invention has been made in view of the above-mentioned problems, and its gist is to place optical glass in a mold having a molding surface that forms the functional surface of an optical lens.
In the optical element molding method of molding a lens by heating and pressurizing the optical glass and mold member and transferring the molding surface of the mold member to the surface of the optical glass, After reaching the temperature, pressurization is applied, and then the optical glass is cooled according to the first cooling rate until it becomes below the transition point, and then the second cooling rate is increased from the first cooling rate. A method for molding an optical element, characterized in that cooling is performed according to the following cooling rate.

以下、本発明による光学素子の成形方法の実施
例について説明する。 Examples of the method for molding an optical element according to the present invention will be described below.

実施例 １ １〜2μの粒径に粉砕した炭化タングステン
（WC）100重量部にコバルト（Co）５重量部を混
合し外径17mm厚さ15mmにプレス後、焼結した素材
を、熱間静圧プレス法（HIP）により気体（アル
ゴン）を圧力媒体として5000Kg／cm2の高圧をかけ
て緻密化した。Example 1 5 parts by weight of cobalt (Co) was mixed with 100 parts by weight of tungsten carbide (WC) pulverized to a particle size of 1 to 2μ, and the material was pressed into an outer diameter of 17 mm and a thickness of 15 mm, and then sintered. It was densified by pressure pressing (HIP) using gas (argon) as a pressure medium and applying a high pressure of 5000 kg/cm 2 .

次にカーブゼネレータ（球面創成機）を使用し
レンズの球面を創成するのと同じ要領で研削し表
面粗さをRmax10μｍ程度にした。さらに粒径10μ
ｍのアルミナ砥粒を使つてラツピングして1μｍ
程度の表面粗さにしこれに粒径0.5μｍのダイヤに
よつて磨き上げて第１図イに示すようにRmaxを
0.03μｍ以下とした。 Next, using a curve generator (spherical surface generating machine), it was ground in the same manner as creating the spherical surface of a lens to obtain a surface roughness of approximately Rmax 10 μm. In addition, the particle size is 10μ
Lapping to 1μm using m alumina abrasive grains
Polish the surface with a diamond of 0.5μm in diameter to obtain Rmax as shown in Figure 1A.
It was set to 0.03 μm or less.

レンズの成形装置と加工手順を第２図によつて
説明する。 The lens molding apparatus and processing procedure will be explained with reference to FIG.

第２図中、１は密閉容器、２はその蓋、３は光
学素子を成形するための上型、４はその下型、５
は上型をおさえるための上型おさえ、６は胴型、
７は型ホルダー、８はヒータ、９は下型をつき上
げるつき上げ棒、１０は該つき上げ棒を作動する
エアシリンダ、１１は油回転ポンプ、１２，１
３，１４はバルブ、１５は窒素ガス導入パイプ、
１６はバルブ、１７は排出パイプ、１８はバル
ブ、１９は温度センサ、２０は水冷パイプ、２１
は密閉容器を載せる台を示す。 In Fig. 2, 1 is a sealed container, 2 is a lid thereof, 3 is an upper mold for molding an optical element, 4 is a lower mold, 5
6 is the upper mold holder to hold the upper mold, 6 is the body mold,
7 is a mold holder, 8 is a heater, 9 is a lifting rod that lifts up the lower mold, 10 is an air cylinder that operates the lifting rod, 11 is an oil rotary pump, 12, 1
3 and 14 are valves, 15 is a nitrogen gas introduction pipe,
16 is a valve, 17 is a discharge pipe, 18 is a valve, 19 is a temperature sensor, 20 is a water cooling pipe, 21
indicates a stand on which a sealed container is placed.

光学素子を製造するにあたつて、前準備として
フリント系光学ガラス（SF14）を外径15.8mm厚
さ２mmの円板状にしたものを両面磨いておく（こ
れをブランクと呼ぶ）。密閉容器１の蓋２をあけ、
ブランク２２を下型４の上にのせて型３をセツト
してから密閉容器の蓋２を閉じ水冷パイプ２０に
水を流してヒータ８に通電する。このとき窒素ガ
ス用バルブ１６および１８は閉じ排気系バルブ１
２，１３，１４も閉じている。尚油回転ポンプ１
１は常に回転している。 Before manufacturing an optical element, as a preliminary preparation, a disk-shaped piece of flint optical glass (SF14) with an outer diameter of 15.8 mm and a thickness of 2 mm is polished on both sides (this is called a blank). Open the lid 2 of the airtight container 1,
After placing the blank 22 on the lower mold 4 and setting the mold 3, the lid 2 of the airtight container is closed, water is allowed to flow through the water cooling pipe 20, and the heater 8 is energized. At this time, nitrogen gas valves 16 and 18 are closed and exhaust system valve 1 is closed.
2, 13, and 14 are also closed. Shang oil rotary pump 1
1 is always rotating.

バルブ１２を開け排気をはじめ10-2Torr以下
になつたらバルブ１２を閉じバルブ１６を開いて
窒素ガスをボンベより密閉容器内に導入する。温
度が650℃になつたらエアシリンダ１０を作動さ
せて10Kg／cm2の圧力で成形する。転移点以下にな
るまで加圧をつづけこの間は冷却速度を第一次冷
却速度として10℃／min位に制御する。その後は
第二次冷却速度として20℃／min以上の速度で冷
却を行い200℃以下に下がつたらバルブ１６を閉
じバルブ１３を開いて密閉容器１内に空気を導入
する。それから蓋２を開け上型おさえ５をはずし
て成形物を取り出す。 The valve 12 is opened and exhaust begins, and when the temperature becomes below 10 -2 Torr, the valve 12 is closed and the valve 16 is opened to introduce nitrogen gas from the cylinder into the sealed container. When the temperature reaches 650°C, the air cylinder 10 is activated and molding is performed at a pressure of 10 kg/cm 2 . Pressurization is continued until the temperature falls below the transition point, and during this time the cooling rate is controlled at about 10°C/min as the primary cooling rate. After that, cooling is performed at a rate of 20° C./min or more as a secondary cooling rate, and when the temperature drops to 200° C. or less, the valve 16 is closed, the valve 13 is opened, and air is introduced into the closed container 1. Then, open the lid 2, remove the upper mold presser 5, and take out the molded product.

上記のようにして、フリント系光学ガラス
（SF14）（軟化点SP＝586℃、転移点Tg＝485℃）
を使用して、第３図に示す形状および寸法のレン
ズを成形した結果、第１図イに示す表面粗さの型
とほぼ同じ表面粗さのレンズを得ることができ
た。 As above, flint optical glass (SF14) (softening point SP = 586℃, transition point Tg = 485℃)
As a result of molding a lens having the shape and dimensions shown in FIG. 3 using the mold, it was possible to obtain a lens having a surface roughness almost the same as that of the mold shown in FIG. 1A.

この時の成形条件すなわち時間−温度関係図を
第４図に示す。 FIG. 4 shows the molding conditions at this time, that is, a time-temperature relationship diagram.

すなわち、第４図から明らかなように第一次冷
却速度として10℃／min位に制御して光学素子を
成形用型から離型する温度（約35℃）までこの第
一次冷却速度のみで冷却する場合には、一成形サ
イクルとして約90分を要するが、本実施例におい
ては約72分で冷却が完結することになり、一成形
サイクル当り約18分が節約される。このことはこ
の種光学素子の成形方法における著しい生産性の
向上をもたらすこととなる。 In other words, as is clear from Fig. 4, the primary cooling rate is controlled at about 10°C/min, and the temperature at which the optical element is released from the mold (approximately 35°C) is reached by only this primary cooling rate. In the case of cooling, one molding cycle takes about 90 minutes, but in this example, cooling is completed in about 72 minutes, saving about 18 minutes per molding cycle. This results in a significant improvement in productivity in the method of molding this type of optical element.

実施例 ２ 実施例１と同様に１〜2μｍの粒径に粉砕した
炭化タングステン100重量部に、コバルト５重量
部およびニツケル５重量部より成る材料を使用し
て、実施例１と同様にして表面粗さRmax0.03μ
ｍ以下の型をつくつた。Example 2 A material consisting of 5 parts by weight of cobalt and 5 parts by weight of nickel was used on 100 parts by weight of tungsten carbide pulverized to a particle size of 1 to 2 μm in the same manner as in Example 1, and the surface was prepared in the same manner as in Example 1. Roughness Rmax0.03μ
I made a mold less than m.

実施例１と全く同じレンズ成形装置および加工
手順によつてレンズの成形をしたところ、実施例
１と同様の結果が得られる。 When a lens was molded using the same lens molding apparatus and processing procedure as in Example 1, the same results as in Example 1 were obtained.

本発明の光学素子の成形方法によれば、光学ガ
ラスを光学レンズの機能面に形成する成形表面を
有する成形用型に入れ、前記の光学ガラスおよび
型部材を加熱・加圧し前記型部材を成形表面を前
記光学ガラスの表面に転写することによつてレン
ズを成形するに際し、前記光学ガラスの所定の加
圧温度に達した後に加圧を行ない、その後、前記
光学ガラスが転移点以下になるまでは第一次冷却
速度にしたがつて冷却し、その後、前記第一次冷
却速度より速度を増した第二次冷却速度にしたが
つて冷却するようにしたので、精密な光学素子を
高い生産性をもつて成形することが可能となつ
た。 According to the method for molding an optical element of the present invention, optical glass is placed in a mold having a molding surface to be formed as a functional surface of an optical lens, and the optical glass and mold member are heated and pressurized to mold the mold member. When molding a lens by transferring the surface onto the surface of the optical glass, pressurization is performed after the optical glass reaches a predetermined pressing temperature, and then until the optical glass reaches a transition point or below. is cooled according to the first cooling rate, and then cooled according to the second cooling rate, which is faster than the first cooling rate, making it possible to manufacture precision optical elements with high productivity. It became possible to mold with

【図面の簡単な説明】[Brief explanation of the drawing]

第１図イは、本発明の実施に当り使用する成形
用型の表面粗さの例を示す図、第１図ロ，ハは従
来のグラアイトの型の表面粗さおよび成形された
レンズの表面粗さを示す図、第２図はレンズの成
形装置を示す断面図、第３図は成形されるレンズ
の一例の形状および寸法を示す図、第４図は本発
明による成形の際における時間−温度関係図であ
る。 １……密閉容器、２……蓋、３……上型、４…
…下型、５……上型おさえ、６……胴、７……型
ホルダー、８……ヒータ、９……つき上げ棒、１
０……エアンシリンダ、１１……油回転ポンプ、
１２，１３，１４……バルブ、１５……窒素ガス
導入パイプ、１６……バルブ、１７……排出パイ
プ、１８……バルブ、１９……温度センサ、２０
……水冷パイプ、２１……台、６……胴。 Figure 1A shows an example of the surface roughness of a mold used in carrying out the present invention, and Figures 1B and 1C show the surface roughness of a conventional graite mold and the surface of a molded lens. FIG. 2 is a sectional view showing a lens molding apparatus, FIG. 3 is a diagram showing the shape and dimensions of an example of a lens to be molded, and FIG. 4 is a diagram showing time during molding according to the present invention. It is a temperature relationship diagram. 1... airtight container, 2... lid, 3... upper mold, 4...
...lower die, 5...upper die presser, 6...body, 7...mold holder, 8...heater, 9...lifting rod, 1
0...Air cylinder, 11...Oil rotary pump,
12, 13, 14... Valve, 15... Nitrogen gas introduction pipe, 16... Valve, 17... Discharge pipe, 18... Valve, 19... Temperature sensor, 20
...Water cooling pipe, 21...stand, 6...body.

Claims (1)

【特許請求の範囲】 １ 光学ガラスを光学レンズの機能面に形成する
成形表面を有する成形用型に入れ、前記の光学ガ
ラスおよび型部材を加熱・加圧し前記型部材の成
形表面を前記光学ガラスの表面に転写することに
よつてレンズを成形する光学素子の成形方法にお
いて、 前記光学ガラスの所定の加圧温度に達した後に
加圧を行ない、 その後、前記光学ガラスが転移点以下になるま
では第一次冷却速度にしたがつて冷却し、 その後、前記第一次冷却速度より速度を増した
第二次冷却速度にしたがつて冷却するようにした
ことを特徴とする光学素子の成形方法。 ２ 前記第二次冷却速度は前記第一次冷却速度の
略２倍以上の速度で冷却することを特徴とする特
許請求の範囲第１項記載の光学素子の成形方法。[Scope of Claims] 1. Optical glass is placed in a mold having a molding surface to be formed as a functional surface of an optical lens, and the optical glass and mold member are heated and pressurized so that the molding surface of the mold member becomes the optical glass. In a method for molding an optical element in which a lens is molded by transferring onto the surface of the optical glass, pressure is applied after the optical glass reaches a predetermined pressing temperature, and then until the optical glass reaches a transition point or lower. A method for molding an optical element, characterized in that cooling is performed according to a first cooling rate, and then cooling is performed according to a second cooling rate that is faster than the first cooling rate. . 2. The method for molding an optical element according to claim 1, wherein the second cooling rate is approximately twice or more the first cooling rate.
JP20539490A 1990-08-02 1990-08-02 Formation of optical element Granted JPH03228835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20539490A JPH03228835A (en) 1990-08-02 1990-08-02 Formation of optical element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20539490A JPH03228835A (en) 1990-08-02 1990-08-02 Formation of optical element

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP23116382A Division JPS59123631A (en) 1982-12-28 1982-12-28 How to create a mold for molding optical elements

Publications (2)

Publication Number Publication Date
JPH03228835A JPH03228835A (en) 1991-10-09
JPH0521854B2 true JPH0521854B2 (en) 1993-03-25

Family

ID=16506100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20539490A Granted JPH03228835A (en) 1990-08-02 1990-08-02 Formation of optical element

Country Status (1)

Country Link
JP (1) JPH03228835A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4580677B2 (en) * 2004-04-26 2010-11-17 東芝機械株式会社 Glass forming equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844755A (en) * 1972-11-16 1974-10-29 Eastman Kodak Co Method and apparatus for transfer molding glass lenses
JPS5438126A (en) * 1977-09-01 1979-03-22 Olympus Optical Co Ltd Electrophotography for plural copies
US4260408A (en) * 1979-11-02 1981-04-07 Ppg Industries, Inc. Use of speed changes during cycling of a shaping mold

Also Published As

Publication number Publication date
JPH03228835A (en) 1991-10-09

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