JPH05294640A - Method for molding optical element of glass - Google Patents

Method for molding optical element of glass

Info

Publication number
JPH05294640A
JPH05294640A JP12687092A JP12687092A JPH05294640A JP H05294640 A JPH05294640 A JP H05294640A JP 12687092 A JP12687092 A JP 12687092A JP 12687092 A JP12687092 A JP 12687092A JP H05294640 A JPH05294640 A JP H05294640A
Authority
JP
Japan
Prior art keywords
molding
mold
optical element
glass
temperature
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
Application number
JP12687092A
Other languages
Japanese (ja)
Other versions
JP3162180B2 (en
Inventor
Hiroshi Ito
弘 伊藤
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP12687092A priority Critical patent/JP3162180B2/en
Publication of JPH05294640A publication Critical patent/JPH05294640A/en
Application granted granted Critical
Publication of JP3162180B2 publication Critical patent/JP3162180B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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

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)

Abstract

PURPOSE:To excellently press mold optical elements of glass having large difference in thickness in a short time. CONSTITUTION:A blow tube 3 in an upper mold and a blow tube 32 in a lower mold through which a cooling nitrogen gas is introduced are set in the upper mold 20 and the lower mold 26. The temperature at the central part, for pressing the thick part of a glass optical element to be molded, of the upper and the lower molds 20 and 26 is made lower than that of a peripheral part for pressing the thin part by a nitrogen gas. The cooling is previously carried out before press molding of the glass material. Then, the heated and softened glass material is transported to between the upper mold 20 and the lower mold 26 having a temperature distribution and pressed to mold a glass optical element. During cooling the optical element under pressure, the amount of heat conducted from the thick part to the upper and the lower molds 20 and 26 is increased, cooling of the thick part is promoted and the temperature of the whole glass optical element is uniformed. Consequently, the molding time is shortened and strain will not occur in the glass optical element during cooling.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、加熱軟化したガラス素
材を一対の成形型間に搬送して押圧成形し、ガラス光学
素子を製造するガラス光学素子の成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass optical element molding method for manufacturing a glass optical element by conveying a glass material which has been softened by heating between a pair of molding dies and press-molding the glass material.

【０００２】[0002]

【従来の技術】加熱軟化したガラス素材を上、下型で加
圧冷却する際、ガラス素材内部に温度差が精度が生じる
と、成形品に歪みが低下する。特に、肉厚差の大きい成
形品を得る場合には大きな問題であった。そこで、従
来、肉厚差の大きい成形品の成形に関する技術が、特開
昭６２−１９１１２８号公報、特開平２−５５２３５号
公報及び特開平２−１１１６３５号公報に開示されてい
る。2. Description of the Related Art When a glass material that has been softened by heating is pressed and cooled by an upper die and a lower die, if a temperature difference is generated within the glass material with high accuracy, distortion of a molded article is reduced. In particular, there was a big problem when obtaining a molded product having a large difference in wall thickness. Therefore, heretofore, techniques relating to molding of molded products having a large difference in wall thickness have been disclosed in JP-A-62-191128, JP-A-2-55235, and JP-A-2-111635.

【０００３】特開昭６２−１９１１２８号公報には、上
型、下型及び胴型を有してなり、これらの各々に冷却媒
体流通用の空洞を設けた光学素子の加圧成形用型が提案
されている。そして、上型空洞内に冷却媒体を流すこと
により、成形用型の温度を所定温度に迅速に設定するこ
とが可能になり、製造上の時間的及びエネルギー的損失
を減じることができ、また、温度の精密な制御により光
学素子全体の温度を均一に保ちつつ冷却することが可能
となり、光学素子の歪みを防止できるというものであ
る。Japanese Unexamined Patent Publication (Kokai) No. 62-191128 discloses a mold for pressure-molding an optical element, which comprises an upper mold, a lower mold and a barrel mold, each of which is provided with a cavity for circulating a cooling medium. Proposed. Then, by flowing the cooling medium in the upper mold cavity, it becomes possible to quickly set the temperature of the molding die to a predetermined temperature, and it is possible to reduce time and energy loss in manufacturing, and By precisely controlling the temperature, it becomes possible to cool the entire optical element while keeping the temperature uniform, and it is possible to prevent distortion of the optical element.

【０００４】特開平２−５５２３５号公報には、一対の
凸面成形型と胴型からなる精密ガラスプレス用成形型
で、熱源に接する型の一部にくりぬき部を設け、凹形状
のレンズの光学面部中心の温度を非光学面部の温度より
高く保ちつつ冷却する凹形状レンズの成形型及び成形方
法が記載されている。この成形型及び成形方法にあって
は、成形型のくりぬき部により空気断熱層を介在するこ
とで、冷却加圧時に収縮量の小さいレンズ光学面中心の
温度を高く保ことができ、収縮量の大きい非光学面側と
の収縮差を縮めながら冷却して、形状精度の良好な高精
度の成形レンズを得ようというものである。Japanese Unexamined Patent Publication No. 2-55235 discloses a precision glass press molding die comprising a pair of convex surface molding die and a barrel die, in which a hollow portion is provided in a part of the die which is in contact with a heat source to form an optical lens having a concave shape. A mold and method for molding a concave lens for cooling while maintaining the temperature of the center of the surface higher than the temperature of the non-optical surface are described. In this molding die and molding method, by interposing the air heat insulating layer by the hollow portion of the molding die, it is possible to maintain a high temperature at the center of the lens optical surface with a small shrinkage amount during cooling and pressurization, and It is intended to obtain a molded lens of high precision with good shape precision by cooling while reducing the shrinkage difference from the large non-optical surface side.

【０００５】特開平２−１１１６３５号公報には、凹状
の第１の光学面を有する第１の成形型と、凹状の第２の
光学面を有する第２の成形型と、前記第１及び第２の成
形型を案内する胴型とを具備し、前記第１及び第２の成
形型の少なくとも一方の光学面の背面に外周部凹部を設
けて構成したプレスレンズの成形金型、また、凸状の第
１の光学面を有する第１の成形型と、凸状の第２の光学
面を有する第２の成形型と、前記第１及び第２の成形型
を案内する胴型とを具備し、前記第１及び第２の成形型
の少なくとも一方の光学面の背面の中心部に凹部を設け
て構成したプレスレンズの成形型が記載されている。そ
して、この成形型にあっては、各工程における加熱ステ
ージと成形型の凹部とは接触しないので、熱伝達が制御
されて成形型間のガラス内部に温度差が生じにくくな
る。そして、凹状の光学面を有する成形型を用いて凸レ
ンズ及び凸メニスカスレンズを成形し、一方、凸状の光
学面を有する成形型を用いて凹レンズ及び凹メニスカス
レンズを成形して、高精度のプレスレンズを得ようとす
るものである。Japanese Unexamined Patent Publication (Kokai) No. 2-111635 discloses a first mold having a concave first optical surface, a second mold having a concave second optical surface, and the first and the first molds. And a cylindrical mold for guiding the second molding die, and a press lens molding die formed by providing an outer peripheral concave portion on the back surface of at least one of the optical surfaces of the first and second molding dies, and a convex mold. A first mold having a first optical surface having a circular shape, a second mold having a second optical surface having a convex shape, and a barrel mold for guiding the first and second molds. However, there is described a press lens molding die having a concave portion provided at the center of the back surface of at least one optical surface of the first and second molding dies. Further, in this forming die, the heating stage in each step and the concave portion of the forming die do not come into contact with each other, so that heat transfer is controlled and a temperature difference is less likely to occur inside the glass between the forming dies. Then, a convex lens and a convex meniscus lens are molded using a molding die having a concave optical surface, while a concave lens and a concave meniscus lens are molded using a molding die having a convex optical surface, and a high precision press It is about trying to get a lens.

【０００６】[0006]

【発明が解決しようとする課題】しかし、特開昭６２−
１９１１２８号公報の成形用型を用いて光学素子を成形
する際、押圧成形開始以後に成形用型の空洞内に冷却媒
体としての液体または気体を流して型温度の制御をして
いるため、特に肉厚差の大きい光学素子を成形する場合
には、押圧成形過程だけでは成形用型間のガラスを均温
制御できないことがある。また、特開平２−５５２３５
号公報及び特開平２−１１１６３５号公報の成形方法
は、成形型の背面に設けた凹部により空気断熱層を形成
することにより熱伝達を制御して押圧成形過程のレンズ
内部に温度差を生じにくくしているが、これらの成形方
法にあっても、押圧成形開始以後にガラスと成形型間の
熱伝導効率を制御することになり、特に肉厚差の大きい
光学素子を成形する場合には、押圧成形過程だけでは成
形型間のガラスを均温制御できないことがある。However, Japanese Patent Laid-Open No. 62-
When an optical element is molded using the molding die disclosed in Japanese Patent No. 1911128, a mold temperature is controlled by flowing a liquid or a gas as a cooling medium into the cavity of the molding die after the press molding is started. When molding an optical element having a large difference in wall thickness, it may be impossible to control the temperature of the glass between the molding dies only by the pressing molding process. In addition, JP-A-2-55235
In the molding method disclosed in Japanese Patent Laid-Open No. 2-111635 and Japanese Patent Laid-Open No. 2-111635, a heat insulating layer is formed by a concave portion provided on the back surface of the molding die to control heat transfer, and a temperature difference is less likely to occur inside the lens during the press molding process. However, even in these molding methods, it is to control the heat conduction efficiency between the glass and the molding die after the start of press molding, especially when molding an optical element with a large thickness difference, In some cases, it is not possible to control the temperature of the glass between the molds only by the press molding process.

【０００７】本発明は、上記従来技術の問題点に鑑みな
されたもので、肉厚差の特に大きいガラス光学素子の成
形にあっても、加圧冷却の際にガラス内部の温度差が生
じにくく、良好な形状精度で成形できるガラス光学素子
の成形方法を提供することを目的とする。The present invention has been made in view of the above problems of the prior art. Even when molding a glass optical element having a large difference in wall thickness, a temperature difference inside the glass is unlikely to occur during pressure cooling. An object of the present invention is to provide a method for molding a glass optical element that can be molded with good shape accuracy.

【０００８】[0008]

【課題を解決するための手段】上記目的を達成するため
に、本発明は、加熱軟化したガラス素材を一対の成形型
間に搬送して押圧成形するガラス光学素子の成形方法に
おいて、成形するガラス光学素子の厚肉部を押圧する前
記成形型成形部の温度が前記ガラス光学素子の薄肉部を
押圧する成形部より低くなるように、前記成形型に設け
た温度制御手段によって、予め前記成形型を所定の温度
に制御し、その後前記ガラス素材を前記成形型間に搬送
するこことした。In order to achieve the above object, the present invention provides a glass optical element molding method in which a heat-softened glass material is conveyed between a pair of molding dies and pressure-molded. The molding die that presses the thick portion of the optical element has a temperature lower than that of the molding portion that presses the thin portion of the glass optical element by the temperature control means provided in the molding die in advance. Was controlled to a predetermined temperature, and then the glass material was conveyed between the molding dies.

【０００９】[0009]

【作用】上記構成の成形方法によれば、ガラス光学素子
の押圧成形前に、凸形状のガラス光学素子では温度制御
手段により成形型の中央部を冷却し、また凹形状のガラ
ス光学素子では温度制御手段により成形型の外周部を冷
却することにより、予め成形型の成形部の中央部と外周
部とに温度分布が形成される。この状態の成形型でガラ
ス素材を押圧成形すると、厚肉部を押圧する成形部の方
がより温度が低いので、厚肉部からの熱伝導量が多くな
り、加圧冷却過程におけるガラス光学素子全体の均温化
が促進される。そして、押圧成形過程において、温度制
御手段の冷却効率を高めることにより、さらに厚肉部は
冷却されるので肉厚差の大きいガラス光学素子を成形す
る場合においても、ガラス光学素子内部の均温度冷却が
可能になる。According to the molding method of the above construction, the temperature control means cools the central portion of the molding die in the convex glass optical element and the temperature in the concave glass optical element before the pressure molding of the glass optical element. By cooling the outer peripheral portion of the molding die by the control means, a temperature distribution is formed in advance in the central portion and outer peripheral portion of the molding portion of the molding die. When the glass material is press-molded with the molding die in this state, the temperature of the molding portion that presses the thick portion is lower, so the amount of heat conduction from the thick portion increases, and the glass optical element in the pressure cooling process The temperature equalization of the whole is promoted. Further, in the press-molding process, by increasing the cooling efficiency of the temperature control means, the thick portion is further cooled, so that even in the case of molding a glass optical element having a large difference in wall thickness, the uniform temperature cooling inside the glass optical element is performed. Will be possible.

【００１０】[0010]

【実施例１】図１は、本発明に係るガラス光学素子の成
形方法の実施例１の実施に用いる成形装置の成形型部を
示す拡大断面図、図２は、成形装置を示す断面図であ
る。図２において、１で示すのは成形部で、加熱炉ヒー
タ２ａを備えた加熱炉２が隣接されている。成形部１及
び加熱炉２の周辺は、石英ガラス管またはステンレス製
管からなるカバー３及び上ベース４、下ベース５により
閉塞されており、これらのカバー３、上、下ベース４，
５により成形室６が形成されている。上、下ベース４，
５には、雰囲気ガス供給装置（図示省略）に接続したガ
スノズル７が貫設され、このガスノズル７を介して成形
室６内に供給される窒素ガス、不活性ガスまたは還元性
ガスにより成形室６内部の酸化を防止している。上ベー
ス４と下ベース５とは、図示を省略してある部材を介し
て結合されており、上ベース４と下ベース５との間の相
互の距離、位置が変化しないように構成されている。EXAMPLE 1 FIG. 1 is an enlarged sectional view showing a molding die portion of a molding apparatus used for carrying out Example 1 of the method for molding a glass optical element according to the present invention, and FIG. 2 is a sectional view showing the molding apparatus. is there. In FIG. 2, reference numeral 1 denotes a molding portion, and the heating furnace 2 provided with the heating furnace heater 2a is adjacent to the molding portion. The periphery of the molding unit 1 and the heating furnace 2 is closed by a cover 3 made of a quartz glass tube or a stainless steel tube, an upper base 4 and a lower base 5, and these covers 3, the upper and lower bases 4, 4.
A molding chamber 6 is formed by 5. Upper and lower base 4,
5, a gas nozzle 7 connected to an atmosphere gas supply device (not shown) is provided so as to penetrate the molding chamber 6 by a nitrogen gas, an inert gas or a reducing gas supplied into the molding chamber 6 through the gas nozzle 7. Prevents internal oxidation. The upper base 4 and the lower base 5 are coupled via a member (not shown) so that the mutual distance and position between the upper base 4 and the lower base 5 do not change. ..

【００１１】成形室６内には、上型部８と下型部９とが
同一軸線上で相対的に接近・離反自在に対向配置されて
いる。上型部８は上ベース４に固定され、下型部９はプ
レス軸１０の先端に固定されている。プレス軸１０は、
下ベース５の下面に固定したハウジング１１内で軸受け
（摺動用軸受け）１２により軸方向へ摺動自在に保持さ
れるとともに、その下端で連結した駆動用シリンダ１３
によって昇降駆動自在に設けられている。In the molding chamber 6, an upper mold part 8 and a lower mold part 9 are arranged opposite to each other so as to be relatively close to and away from each other on the same axis. The upper mold part 8 is fixed to the upper base 4, and the lower mold part 9 is fixed to the tip of the press shaft 10. The press shaft 10 is
A drive cylinder 13 is held slidably in the axial direction by a bearing (sliding bearing) 12 in a housing 11 fixed to the lower surface of the lower base 5, and is connected at its lower end.
It is provided so that it can be driven up and down.

【００１２】また、図において１４で示すのは、光学ガ
ラス素材１５及びプレス成形後のガラス光学素子を載
置、搬送するキャリアで、このキャリア１４はキャリア
搬送用アーム１６により保持され、図示しない温度制御
装置によって所定の温度に設定し得る加熱炉２内を移送
され、成形部１の上型部８と下型部９との間に搬送され
るように制御構成されている。Reference numeral 14 in the drawing denotes a carrier on which the optical glass material 15 and the glass optical element after press molding are placed and conveyed, and the carrier 14 is held by a carrier conveying arm 16 and has a temperature not shown. The control device is configured so as to be transferred in the heating furnace 2 capable of setting a predetermined temperature and to be conveyed between the upper mold part 8 and the lower mold part 9 of the molding part 1.

【００１３】上型部８は、図１に示すように、上ベース
４に固定された上型マウント１７と、上型マウント１７
の外周に巻き付けられた上型ヒータ１８と、上型マウン
ト１７内に設置された温度センサ１９と、上型マウント
１７に固定された上型２０と、上型２０の外周部に巻か
れた上型加熱ヒータ２１と、上型１の先端部付近に設置
された温度センサ２２とから構成されている。上型ヒー
タ１８は、温度センサ１９及び図示を省略した温度制御
装置と接続され所定の温度に制御自在となっている。ま
た、上型加熱ヒータ２１は、温度センサ２２及び図示を
省略した温度制御装置と接続され所定の温度に制御自在
となっている。同様に、下型部９は、下型マウント２
３，下型ヒータ２４，温度センサ２５，下型２６，下型
加熱ヒータ２７及びセンサ２８からなっている。As shown in FIG. 1, the upper mold part 8 includes an upper mold mount 17 fixed to the upper base 4 and an upper mold mount 17.
An upper die heater 18 wound around the outer periphery of the upper die, a temperature sensor 19 installed in the upper die mount 17, an upper die 20 fixed to the upper die mount 17, and an upper die wound around the outer periphery of the upper die 20. It comprises a mold heater 21 and a temperature sensor 22 installed near the tip of the upper mold 1. The upper die heater 18 is connected to a temperature sensor 19 and a temperature control device (not shown) so that it can be controlled to a predetermined temperature. Further, the upper die heater 21 is connected to a temperature sensor 22 and a temperature control device (not shown) so that it can be controlled to a predetermined temperature. Similarly, the lower mold part 9 is the lower mold mount 2
3, a lower die heater 24, a temperature sensor 25, a lower die 26, a lower die heater 27 and a sensor 28.

【００１４】上型マウント１７は、Ｓｉ3 Ｎ4 −Ａｌ2
Ｏ3 系セラミックス（線膨張係数３．５×１０-6）から
なり、その上端が上ベース４に固定されるとともに、そ
の下端面（先端面）には上型２０を位置決めして固定す
るための凹部１７ａが設けられており、この凹部１７ａ
の底面は平面仕上げされている。上型マウント１７のの
中央部には上下方向に貫通孔１７ｂが設けられ、この貫
通孔１７ｂの上部には、上型マウント１７の側面に開口
した排気孔１７ｃが上型マウント１７を横断するように
して連通されている。The upper die mount 17 is made of Si 3 N 4 --Al 2
It is made of O 3 -based ceramics (coefficient of linear expansion 3.5 × 10 −6 ), its upper end is fixed to the upper base 4, and the upper mold 20 is positioned and fixed to its lower end surface (tip surface). Is provided with a recess 17a.
The bottom surface of is flat-finished. A through hole 17b is provided in the vertical direction at the center of the upper die mount 17, and an exhaust hole 17c opened on the side surface of the upper die mount 17 crosses the upper die mount 17 above the through hole 17b. It is communicated with.

【００１５】上型２０は、超硬合金（熱膨張係数４×１
０-6）からなり、その成形面２０ａは所定の凹形状に精
密に鏡面仕上げされてから、ガラスとの融着性の低いＣ
ｒＮ薄膜２０ｂがコートされ、一方、成形面２０ａの反
対側の端面（以下、底面という）２０ｃは精密な平面に
仕上げられている。さらに、上型２０には、底面２０ｃ
中央から成形面２０ａの方向に向けて単一の空洞部２９
が設けられている。この上型２０は、その底部を凹部１
７ａ内に収納し、上型マウント１７の先端に取り付けら
れている。凹部１７ａに収納された上型２０の底部外周
面の外径は、上型２０が上型ヒータ１８によって所定の
温度に加熱された時に、下部外周面が凹部１７ａの内周
面と焼きばまって固定されるように、凹部１７ａの内周
面間で所定のクリアランスを有するように線膨張係数を
考慮した寸法に形成されている。このとき、上型マウン
ト１７と上型２０とは、熱伝導が良好に行なわれるよう
に互いに密着する。The upper die 20 is made of cemented carbide (coefficient of thermal expansion 4 × 1).
0 -6 ), the molding surface 20a of which is precisely mirror-finished into a predetermined concave shape, and which has a low fusion property with glass C
The rN thin film 20b is coated, while the end surface (hereinafter referred to as the bottom surface) 20c on the opposite side of the molding surface 20a is finished to a precise flat surface. Further, the upper die 20 has a bottom surface 20c.
A single cavity 29 from the center toward the molding surface 20a
Is provided. The upper mold 20 has a concave portion 1 at the bottom thereof.
It is housed in 7 a and attached to the tip of the upper die mount 17. The outer diameter of the bottom outer peripheral surface of the upper die 20 housed in the recess 17a is such that when the upper die 20 is heated to a predetermined temperature by the upper die heater 18, the lower outer peripheral surface is burned with the inner peripheral surface of the recess 17a. So as to be fixed in place, it is formed in a size considering the linear expansion coefficient so as to have a predetermined clearance between the inner peripheral surfaces of the recesses 17a. At this time, the upper mold mount 17 and the upper mold 20 are in close contact with each other so that heat conduction is good.

【００１６】下型マウント２３は、プレス軸１０の先端
面に固着されている。下型マウント２３及び下型２６
は、上型マウント１７及び上型２０と同様に構成されて
いる。すなわち、下型マウント２３はＳｉ3 Ｎ4 −Ａｌ
2 Ｏ3 系セラミックス（線膨張係数３．５×１０-6）か
らなり、その上端面に下型２６の位置決め固定用の凹部
２３ａが形成されている。また、その中央内部に貫通孔
２３ｂが設けられ、下型マウント２３の外側の開口した
排気孔２３ｃが貫通孔２３ｂと連通して設けられてい
る。一方、下型２６は超硬合金（線膨張係数４×１
０-6）からなり、成形面２６ａは所定の凹形状に精密に
鏡面仕上げされてから、ガラスとの融着性の低いＣｒＮ
薄膜２６ｂがコートされている。さらに、底面２６ｃ中
央から成形面２６ａの方向に向けて単一の空洞部３０が
設けられている。The lower die mount 23 is fixed to the tip surface of the press shaft 10. Lower mold mount 23 and lower mold 26
Is configured similarly to the upper mold mount 17 and the upper mold 20. That is, the lower mold mount 23 is made of Si 3 N 4 -Al.
It is made of 2 O 3 -based ceramics (coefficient of linear expansion of 3.5 × 10 −6 ), and a recess 23 a for positioning and fixing the lower die 26 is formed on the upper end surface thereof. Further, a through hole 23b is provided inside the center thereof, and an exhaust hole 23c opened outside the lower mold mount 23 is provided so as to communicate with the through hole 23b. On the other hand, the lower mold 26 is made of cemented carbide (coefficient of linear expansion 4 × 1).
Consists 0 -6), forming surface 26a from being precisely mirror-finished to a predetermined concave shape, low fusing with the glass CrN
The thin film 26b is coated. Further, a single cavity 30 is provided from the center of the bottom surface 26c toward the molding surface 26a.

【００１７】上記上型マウント１７の貫通孔１７ｂ内に
は、上ベース４を貫通して成形室６外から上型内部ブロ
ー管３１が挿入され、この上型内部ブロー管３１の先端
開口部が、上型２０の空洞部２９内に位置するように配
管されている。同様に、下型マウント２３の貫通孔２３
ｂ内には、プレス軸１０を貫通して成形室６外から下型
内部ブロー管３２の先端開口部が下型２６の空洞部３０
内に位置するように配管されている。この上型内部ブロ
ー管３１と下型内部ブロー管３２は、図２に示すよう
に、それぞれソレノイド弁３３，３４及び流量調節弁３
５，３６を経て窒素ガス供給装置３７に接続されてい
る。そして、上型２０，下型２６を加熱した状態におい
て、窒素ガス供給装置３７から供給された所定量の窒素
ガスを上型内部ブロー管３３１及び／または下型内部ブ
ロー管３２の先端から流出すると、窒素ガスは上型２０
の空洞部２９及び／または下型２６の空洞部３０の成形
面方向の内面２９ａ，３０ａ付近の熱を奪いながら、
上、下型マウント１７，２３の排気孔１７ｃ，２３ｃか
ら成形室６内に排気される。なお、窒素ガス供給装置３
７から窒素ガスの流出量は、成形工程の前後で任意に変
更自在になっている。An upper mold internal blow pipe 31 is inserted from the outside of the molding chamber 6 through the upper base 4 into the through hole 17b of the upper mold mount 17, and the upper end internal blow pipe 31 has an opening portion. The pipe is arranged so as to be located inside the cavity 29 of the upper mold 20. Similarly, the through hole 23 of the lower mold mount 23
In b, the tip end opening of the lower mold internal blow pipe 32 penetrates the press shaft 10 from the outside of the molding chamber 6 and the cavity 30 of the lower mold 26 is provided.
It is piped to be located inside. As shown in FIG. 2, the upper mold internal blow pipe 31 and the lower mold internal blow pipe 32 respectively include solenoid valves 33 and 34 and a flow rate control valve 3.
It is connected to a nitrogen gas supply device 37 via 5, 36. Then, when the upper mold 20 and the lower mold 26 are heated, a predetermined amount of nitrogen gas supplied from the nitrogen gas supply device 37 flows out from the tips of the upper mold internal blow pipe 331 and / or the lower mold internal blow pipe 32. , Nitrogen gas is upper mold 20
While depriving heat from the inner surfaces 29a, 30a of the cavity 29 of the lower mold 26 and / or the cavity 30 of the lower mold 26 in the molding surface direction,
Gas is exhausted into the molding chamber 6 through the exhaust holes 17c and 23c of the upper and lower mold mounts 17 and 23. The nitrogen gas supply device 3
The outflow amount of nitrogen gas from 7 can be arbitrarily changed before and after the molding process.

【００１８】次に、上記構成からなる成形装置を用いた
本発明に係るガラス光学素子の成形方法の実施例１を作
用とともに説明する。本実施例では、硝種ＳＫ１１を用
い、外径１１ｍｍ，曲率８ｍｍ及び１０ｍｍ，肉厚４．
５ｍｍの両凸形状のガラス光学素子を成形した。まず、
成形室６内部に上、下ベース４，５のガスノズル７から
窒素ガス等を供給し、成形室６内部の酸素濃度を１％以
下に置換する。次に、加熱炉ヒータ２ａにより加熱炉２
を８５０℃の温度に加熱する。また、上型ヒータ１８及
び下型ヒータ２４により上型マウント１７及び下型マウ
ント２３を５５０℃の温度に加熱して、上型２０及び下
型２６を上型マウント２３及び下型マウント２３にそれ
ぞれ固定する。そして、上型内部ブロー管３１及び／ま
たは下型内部ブロー管３２から毎分８リットルの流量で
窒素ガスを流出しながら、上型加熱ヒータ２１及び／ま
たは下型加熱ヒータ２７で加熱することによって、上型
２０及び／または下型２６の先端温度を５３０℃の温度
に保つ。このとき、型表面温度は中央部で５１５℃、外
周部で５３０℃であった。Next, Example 1 of the method for molding a glass optical element according to the present invention using the molding apparatus having the above structure will be described together with its operation. In this embodiment, the glass type SK11 is used, the outer diameter is 11 mm, the curvatures are 8 mm and 10 mm, and the wall thickness is 4.
A 5 mm biconvex glass optical element was molded. First,
Nitrogen gas or the like is supplied into the molding chamber 6 from the gas nozzles 7 of the upper and lower bases 4 and 5 to replace the oxygen concentration in the molding chamber 6 with 1% or less. Next, the heating furnace 2 is heated by the heating furnace heater 2a.
Is heated to a temperature of 850 ° C. Further, the upper die mount 17 and the lower die mount 23 are heated to a temperature of 550 ° C. by the upper die heater 18 and the lower die heater 24, and the upper die 20 and the lower die 26 are respectively placed on the upper die mount 23 and the lower die mount 23. Fix it. Then, by heating the upper mold heater 21 and / or the lower mold heater 27 while flowing nitrogen gas from the upper mold internal blow pipe 31 and / or the lower mold internal blow pipe 32 at a flow rate of 8 liters / min. , The tip temperature of the upper mold 20 and / or the lower mold 26 is maintained at a temperature of 530 ° C. At this time, the mold surface temperature was 515 ° C. in the central part and 530 ° C. in the outer peripheral part.

【００１９】この状態において、キヤリア１４内に光学
ガラス素材１５を載置し、キャリア搬送用アーム１６を
介して加熱炉２内に搬送し、上下の加熱炉ヒータ２ａに
よりガラス素材１５を成形可能な状態になるまで（軟化
点温度６４０℃）加熱軟化処理する。In this state, the optical glass material 15 is placed in the carrier 14 and transferred into the heating furnace 2 via the carrier transfer arm 16, and the glass material 15 can be molded by the upper and lower heating furnace heaters 2a. Heat softening treatment until the state (softening point temperature 640 ° C.).

【００２０】次に、キャリア搬送用アーム１６を前進さ
せ、キャリア１４と共に光学ガラス素材１５を上型２０
と下型２６との間に搬送する。その後、下型２６を駆動
用シリンダ１３によりプレス軸１０を介して上動させ、
上、下型２０，２６の各成形面２０ａ，２６ａにより軟
化状態の光学ガラス素材１５をプレス圧力１５０ｋｇ／
ｃｍ2 で１５秒間プレス成形する。このとき、少なくと
もプレス成形の時間の中で、窒素ガス供給装置３７を制
御して、上型内部ブロー管３１及び／または下型内部ブ
ロー管３２の先端から流出する窒素ガスの流量を毎分２
５リットルに増加し、上型２０及び／または下型２６の
中央部からの冷却効果を強める。これにより、上型２０
及び／または下型２６の中央部が周辺部より更に低い温
度になるので。プレス成形中の光学ガラス素材１５の光
学面中央の冷却速度は大きくなる。従って、光学ガラス
素材１５の中央温度が外周部の温度に対し均温化されつ
つ、光学ガラス素材１５が加圧冷却されつつ、均等に収
縮する結果、短時間の成形で形状精度の良い両凸形状の
ガラス光学素子を容易に得ることができる。Next, the carrier conveying arm 16 is moved forward to move the carrier 14 and the optical glass material 15 together with the upper mold 20.
And the lower mold 26. After that, the lower die 26 is moved upward by the drive cylinder 13 via the press shaft 10,
The softened optical glass material 15 is pressed by the molding surfaces 20a and 26a of the upper and lower molds 20 and 26 at a pressure of 150 kg /
Press-mold at cm 2 for 15 seconds. At this time, at least during the press molding time, the nitrogen gas supply device 37 is controlled so that the flow rate of the nitrogen gas flowing out from the tips of the upper mold inner blow pipe 31 and / or the lower mold inner blow pipe 32 is 2 per minute.
It is increased to 5 liters to enhance the cooling effect from the central portion of the upper mold 20 and / or the lower mold 26. Thereby, the upper mold 20
And / or the temperature of the central portion of the lower mold 26 becomes lower than that of the peripheral portion. The cooling rate at the center of the optical surface of the optical glass material 15 during press molding increases. Therefore, the central temperature of the optical glass material 15 is equalized to the temperature of the outer peripheral portion, and the optical glass material 15 is uniformly cooled while being pressurized and cooled. As a result, the biconvex shape with high shape accuracy can be formed in a short time. A shaped glass optical element can be easily obtained.

【００２１】上、下型２０，２６でのプレス成形が終了
した後、下型２６を下降して離型し、加熱炉２に対して
反対側に設けた徐冷炉（図示省略）中にキャリア搬送用
アーム１６により搬送して、プレス成形されたガラス光
学素子を徐冷する。そして、徐冷が終了した後、徐冷炉
内から搬出し、ガラス光学素子をキャリア１４から取り
出す。このようにして得られたガラス光学素子の光学面
の形状は、所望形状からのズレ量が０．１μｍ程度であ
り、カメラ等の撮像光学系に十分使用できるものであっ
た。本実施例によれば、肉厚差の特に大きい凸レンズに
おいてもガラス内部の温度差が生じにくく、形状精度の
良好なガラス光学素子を短時間で得ることができる。After the press molding by the upper and lower molds 20 and 26 is completed, the lower mold 26 is lowered and released, and the carrier is transferred into a slow cooling furnace (not shown) provided on the opposite side of the heating furnace 2. The press-molded glass optical element is conveyed by the use arm 16 and gradually cooled. After the slow cooling is completed, the glass optical element is taken out of the slow cooling furnace and taken out of the carrier 14. The shape of the optical surface of the glass optical element thus obtained had a deviation of about 0.1 μm from the desired shape, and was sufficiently usable for an imaging optical system such as a camera. According to the present embodiment, even in a convex lens having a large difference in wall thickness, a temperature difference inside the glass hardly occurs, and a glass optical element having good shape accuracy can be obtained in a short time.

【００２２】本実施例の変形例として、凸メニスカスレ
ンズの成形においては、凸面側のみの型内部ブロー管か
ら気体を流入して型冷却を行うことで、実施例１と同様
な作用、効果を得ることができる。また、型内部に流入
する気体は窒素ガスに限定されることなく、高温下での
引火性あるいは人体への有害性がなく、型の劣化を招か
ない不活性な気体であればよく、例えばアルゴンガスで
もよい。As a modified example of the present embodiment, in molding a convex meniscus lens, gas is introduced from a mold internal blow tube only on the convex surface side to cool the mold, thereby achieving the same action and effect as in the first embodiment. Obtainable. Further, the gas flowing into the mold is not limited to nitrogen gas, and may be an inert gas that is not flammable at high temperature or harmful to the human body and does not cause deterioration of the mold. It may be gas.

【００２３】[0023]

【実施例２】図３は、本発明に係るガラス光学素子の成
形方法の実施例２の実施に用いる成形装置の成形型部を
示す拡大断面図である。この成形装置は、両凹形状のガ
ラス光学素子を成形するもので、以下、図１の成形装置
と異なる部分について説明する。図１の成形装置と異な
る点は、上型２０の成形面２０ａ及び下型２６の成形面
２６ａが成形するガラス光学素子の光学面に対応する曲
率の凸形状を有している点、上型２０及び下型２６の中
央部に上型加熱ヒータ４０及び下型加熱ヒータ４１が設
けられている点、そして上型２０及び下型２６のそれぞ
れの側面近傍にリング状の上型ブロー管４２及び下型ブ
ロー管を配設している点である。[Embodiment 2] FIG. 3 is an enlarged cross-sectional view showing a molding die portion of a molding apparatus used for carrying out Embodiment 2 of the method for molding a glass optical element according to the present invention. This molding apparatus molds a glass optical element having a biconcave shape, and only portions different from the molding apparatus of FIG. 1 will be described below. The difference from the molding apparatus of FIG. 1 is that the molding surface 20a of the upper mold 20 and the molding surface 26a of the lower mold 26 have a convex shape with a curvature corresponding to the optical surface of the glass optical element to be molded. The upper die heater 40 and the lower die heater 41 are provided at the central portions of the upper die 20 and the lower die 26, and the ring-shaped upper die blow pipe 42 and the upper die blow pipe 42 are provided near the side surfaces of the upper die 20 and the lower die 26, respectively. This is the point that the lower mold blow pipe is provided.

【００２４】上型加熱ヒータ４０及び下型加熱ヒータ４
１はそれぞれ温度センサ２２及び温度センサ２８と、図
示していない温度制御装置とに接続され、所定の温度に
制御自在となっている。上型ブロー管４２及び下型ブロ
ー管４３は中空の構造になっており、リングの中心に向
かって内周面に複数の排気孔４２ａ及び４３ａがそれぞ
れ形成されている。上型ブロー管４２及び下型ブロー管
４３には、成形室６外の窒素ガス供給装置３７（図１参
照）から窒素ガスを導入するための導入管４４及び４５
がそれぞれ接続されている。そして、導入管４４及び４
５より導かれた窒素ガス供給装置３７からの窒素ガス
は、上型ブロー管４２及び下型ブロー管４３の排気孔４
２ａ及び４３ａから上型２０及び下型２６の側面に向か
って噴出し、上、下型２０，２６の外周部をそれぞれ冷
却する。Upper mold heater 40 and lower mold heater 4
Reference numeral 1 is connected to a temperature sensor 22 and a temperature sensor 28, respectively, and a temperature control device (not shown) so that it can be controlled to a predetermined temperature. The upper mold blow pipe 42 and the lower mold blow pipe 43 have a hollow structure, and a plurality of exhaust holes 42a and 43a are formed in the inner peripheral surface toward the center of the ring, respectively. Introducing pipes 44 and 45 for introducing nitrogen gas from the nitrogen gas supply device 37 (see FIG. 1) outside the molding chamber 6 into the upper mold blowing pipe 42 and the lower mold blowing pipe 43.
Are connected respectively. And the introduction pipes 44 and 4
The nitrogen gas from the nitrogen gas supply device 37, which is introduced from the reference numeral 5, is supplied to the exhaust holes 4 of the upper mold blow pipe 42 and the lower mold blow pipe 43.
It jets from 2a and 43a toward the side surface of the upper mold 20 and the lower mold 26, and cools the outer peripheral portions of the upper mold 20 and the lower mold 26, respectively.

【００２５】次に、上記構成からなる成形装置を用いた
本発明に係るガラス光学素子の成形方法の実施例２を作
用とともに説明する。本実施例では、外径１５ｍｍ，曲
率２０ｍｍ及び３０ｍｍ，肉厚２ｍｍの両凹形状のガラ
ス光学素子を成形した。なお、以下に説明する成形過程
以外は、上記実施例１と同様であるので、その説明を省
略する。上型ブロー管４２及び／または下型ブロー管４
３から毎分１０リットルの流量の窒素ガスを流出しなが
ら、上型加熱ヒータ４０及び／または下型加熱ヒータ４
１加熱することによって、上型２０及び／または下型２
６の先端温度を５４０℃の温度に保つ。このとき、型表
面温度は中央部５２５℃、外周部５４０℃であった。Next, a second embodiment of the method for molding a glass optical element according to the present invention using the molding apparatus having the above structure will be described together with its operation. In this example, a biconcave glass optical element having an outer diameter of 15 mm, curvatures of 20 mm and 30 mm, and a wall thickness of 2 mm was molded. Note that, except for the molding process described below, the process is the same as in Example 1 above, so description thereof is omitted. Upper mold blow pipe 42 and / or lower mold blow pipe 4
The upper die heater 40 and / or the lower die heater 4 while flowing a nitrogen gas at a flow rate of 10 liters per minute from 3
1 By heating, the upper mold 20 and / or the lower mold 2
Keep the tip temperature of 6 at a temperature of 540 ° C. At this time, the mold surface temperature was 525 ° C. in the central portion and 540 ° C. in the outer peripheral portion.

【００２６】この状態で、光学ガラス素材１５（図２参
照）を加熱炉２（図２参照）で成形可能な状態になるま
で（軟化点温度６４０℃）加熱軟化処理した後、この光
学ガラス素材１５を上型２０と下型２６との間に搬送
し、上、下型２０，２６の各成形面２０ａ，２６ａによ
り軟化状態にある光学ガラス素材１５をプレス圧力１５
０ｋｇ／ｃｍ2 で２０秒間プレス成形する。このとき、
少なくともプレス成形の時間の中で、窒素ガス供給装置
３７（図２参照）を制御して、上型ブロー管４２及び／
または下型ブロー管４３より流出する窒素ガスの流量を
毎分３５リットルに増加し、上型２０及び／または下型
２６の外周部からの冷却効果を強める。これにより、上
型２０及び／または下型２６の周辺部が中央部より更に
低い温度になるので、プレス成形中の光学ガラス素材１
５の光学面部外部の冷却速度は大きくなる。従って、光
学ガラス素材１５の外周温度は中心温度に対し均温化さ
れつつ、光学ガラス素材１５が加圧冷却され、均等に収
縮する結果、短時間の成形で形状精度の良い両凸形状の
ガラス光学素子を容易に得ることができる。In this state, the optical glass material 15 (see FIG. 2) is heated and softened until it can be molded in the heating furnace 2 (see FIG. 2) (softening point temperature 640 ° C.), and then the optical glass material 15 is obtained. 15 is conveyed between the upper mold 20 and the lower mold 26, and the optical glass material 15 in the softened state is pressed by the molding surfaces 20a, 26a of the upper and lower molds 20, 26.
Press-mold at 0 kg / cm 2 for 20 seconds. At this time,
At least during the press molding time, the nitrogen gas supply device 37 (see FIG. 2) is controlled to control the upper mold blow pipe 42 and / or
Alternatively, the flow rate of nitrogen gas flowing out from the lower mold blow pipe 43 is increased to 35 liters per minute to enhance the cooling effect from the outer peripheral portion of the upper mold 20 and / or the lower mold 26. As a result, the temperature of the peripheral portion of the upper mold 20 and / or the lower mold 26 becomes lower than that of the central portion, so that the optical glass material 1 during press molding
The cooling rate of the outside of the optical surface part of 5 becomes large. Therefore, while the outer peripheral temperature of the optical glass material 15 is equalized to the center temperature, the optical glass material 15 is pressure-cooled and uniformly contracted, and as a result, the biconvex shaped glass with high shape accuracy can be formed in a short time. The optical element can be easily obtained.

【００２７】このようにして得られたガラス光学素子の
光学面の形状は、所望形状からのズレ量が０．１μｍ程
度であり、カメラ等の撮像光学系に十分使用できるもの
であった。本実施例によれば、肉厚差の特に大きい凹レ
ンズにおいてもガラス内部の温度差が生じにくく、形状
精度の良好なガラス光学素子を短時間で得ることができ
る。The shape of the optical surface of the glass optical element thus obtained had a deviation of about 0.1 μm from the desired shape, and was sufficiently usable for an image pickup optical system such as a camera. According to the present embodiment, even in a concave lens having a particularly large thickness difference, a temperature difference inside the glass hardly occurs, and a glass optical element having good shape accuracy can be obtained in a short time.

【００２８】本実施例の変形例として、凹メニスカスレ
ンズの成形においては、凹面側のみの型ブロー管で型周
辺近傍から気体を吹きかけて型冷却を行なっても、実施
例２と同様な作用、効果を得ることができる。また、吹
きかける気体は窒素ガス限定されることはなく、高温下
での引火性あるいは人体への有害性がなく、型の劣化を
招かない不活性な気体であればよく、例えばアルゴンガ
スでもよい。As a modification of this embodiment, in molding a concave meniscus lens, even if the mold is cooled by blowing gas from the vicinity of the mold with a mold blow tube only on the concave surface side, the same operation as in the second embodiment, The effect can be obtained. Further, the gas to be sprayed is not limited to nitrogen gas, and may be an inert gas that is not flammable at high temperature or harmful to the human body and does not cause deterioration of the mold. For example, argon gas may be used.

【００２９】[0029]

【発明の効果】以上のように、本発明によれば、押圧成
形前に、ガラス光学素子の厚肉部を押圧する成形型成形
部の温度が薄肉部を押圧する成形部より低くなるよう
に、予め成形型に温度分布を形成した後、加熱軟化した
ガラス素材を押圧成形するので、厚肉部の冷却が促進さ
れ、押圧成形過程において、ガラス光学素子全体の均温
化を図ることができる。これにより、特に肉厚差の大き
いガラス光学素子を短時間で歪のない形状精度の良好な
状態に押圧成形することができる。As described above, according to the present invention, the temperature of the molding part for pressing the thick part of the glass optical element is lower than that of the molding part for pressing the thin part before pressing. Since the heat-softened glass material is press-molded after forming the temperature distribution in the molding die in advance, cooling of the thick portion is promoted, and in the press-molding process, the temperature of the entire glass optical element can be equalized. .. This makes it possible to press-mold a glass optical element having a particularly large difference in wall thickness in a short period of time without distortion and with good shape accuracy.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例１に用いる成形装置部を示す拡
大断面図である。FIG. 1 is an enlarged cross-sectional view showing a molding device unit used in a first embodiment of the present invention.

【図２】本発明の実施例１に用いる成形装置を示す断面
図である。FIG. 2 is a cross-sectional view showing a molding apparatus used in Example 1 of the present invention.

【図３】本発明の実施例２に用いる成形装置の成形型部
を示す拡大断面図である。FIG. 3 is an enlarged cross-sectional view showing a molding die section of a molding apparatus used in Example 2 of the present invention.

【符号の説明】[Explanation of symbols]

１５ 光学ガラス素材 ２０ 上型 ２０ａ 成形面 ２６ 下型 ２６ａ 成形面 ３１ 上型内部ブロー管 ３２ 下型内部ブロー管 ４２ 上型ブロー管 ４３ 下型ブロー管 15 Optical glass material 20 Upper mold 20a Molding surface 26 Lower mold 26a Molding surface 31 Upper mold internal blow pipe 32 Lower mold internal blow pipe 42 Upper mold blow pipe 43 Lower mold blow pipe

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 加熱軟化したガラス素材を一対の成形型
間に搬送して押圧成形するガラス光学素子の成形方法に
おいて、成形するガラス光学素子の厚肉部を押圧する前
記成形型成形部の温度が前記ガラス光学素子の薄肉部を
押圧する成形部より低くなるように、前記成形型に設け
た温度制御手段によって、予め前記成形型を所定の温度
に制御し、その後前記ガラス素材を前記成形型間に搬送
することを特徴とするガラス光学素子の成形方法。1. A method of molding a glass optical element in which a heat-softened glass material is conveyed between a pair of molding dies and is pressure-molded, in the method of molding a molding die for pressing a thick portion of the glass optical element to be molded. Is controlled to a predetermined temperature in advance by the temperature control means provided in the molding die so that it is lower than the molding portion that presses the thin portion of the glass optical element, and then the glass material is molded into the molding die. A method for molding a glass optical element, characterized in that the glass optical element is conveyed between them.
JP12687092A 1992-04-20 1992-04-20 Glass optical element molding method Expired - Fee Related JP3162180B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12687092A JP3162180B2 (en) 1992-04-20 1992-04-20 Glass optical element molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12687092A JP3162180B2 (en) 1992-04-20 1992-04-20 Glass optical element molding method

Publications (2)

Publication Number Publication Date
JPH05294640A true JPH05294640A (en) 1993-11-09
JP3162180B2 JP3162180B2 (en) 2001-04-25

Family

ID=14945880

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12687092A Expired - Fee Related JP3162180B2 (en) 1992-04-20 1992-04-20 Glass optical element molding method

Country Status (1)

Country Link
JP (1) JP3162180B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002193626A (en) * 2000-12-25 2002-07-10 Olympus Optical Co Ltd Method of heating glass and forming die and its heating apparatus
JP2002348136A (en) * 2001-05-24 2002-12-04 Olympus Optical Co Ltd Molding unit for optical element
JP2007091586A (en) * 2005-09-28 2007-04-12 Schott Ag Manufacture of optical component part for imaging lens system from melt
JP2007106643A (en) * 2005-10-14 2007-04-26 Ohara Inc Glass molding apparatus and glass molding method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002193626A (en) * 2000-12-25 2002-07-10 Olympus Optical Co Ltd Method of heating glass and forming die and its heating apparatus
JP4557416B2 (en) * 2000-12-25 2010-10-06 オリンパス株式会社 Glass and mold heating method
JP2002348136A (en) * 2001-05-24 2002-12-04 Olympus Optical Co Ltd Molding unit for optical element
JP2007091586A (en) * 2005-09-28 2007-04-12 Schott Ag Manufacture of optical component part for imaging lens system from melt
JP2012106924A (en) * 2005-09-28 2012-06-07 Schott Ag Method for producing optical component part for imaging lens system from melt
JP2007106643A (en) * 2005-10-14 2007-04-26 Ohara Inc Glass molding apparatus and glass molding method

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