JPH04338120A - Method for forming glass optical element - Google Patents
Method for forming glass optical elementInfo
- Publication number
- JPH04338120A JPH04338120A JP13599391A JP13599391A JPH04338120A JP H04338120 A JPH04338120 A JP H04338120A JP 13599391 A JP13599391 A JP 13599391A JP 13599391 A JP13599391 A JP 13599391A JP H04338120 A JPH04338120 A JP H04338120A
- Authority
- JP
- Japan
- Prior art keywords
- glass material
- molding
- optical element
- temperature
- glass
- 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
Links
- 239000011521 glass Substances 0.000 title claims abstract description 89
- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 230000007704 transition Effects 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims description 55
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 1
- 238000003825 pressing Methods 0.000 description 26
- 230000000694 effects Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 101100398412 Arabidopsis thaliana ASK1 gene Proteins 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ガラス素材を加熱軟化
させ、これを一対の成形用型により押圧成形する光学素
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 method of forming an optical element by heating and softening a glass material and press-molding it using a pair of molds.
【０００２】0002
【従来の技術】従来、ガラス素材を加熱軟化させ、これ
を一対の成形用型間に搬送した後、成形用型により押圧
成形して光学素子を得る光学素子の成形方法が知られて
いる。2. Description of the Related Art Conventionally, there has been known a method of forming an optical element by heating and softening a glass material, transporting the glass material between a pair of molds, and then press-molding the glass material with the molds to obtain an optical element.
【０００３】例えば、特開昭６２−２７３３５号公報記
載の発明においては、ガラス素材を加熱するに際し、ガ
ラス素材の表面部および内部をそれぞれ１０９ 〜１０
４．５ ポイズおよび１０１４．５〜１０９ ポイズ相
当の所定温度とし、表面部と内部との間に温度勾配を与
える方法が開示されている。この方法によれば、ガラス
素材と成形用型との両者が、短時間で転移点以下の温度
に達することができ、転写が急速に完了し、成形品を直
ちに成形用型から取り出せるものである。For example, in the invention described in JP-A-62-27335, when heating the glass material, the surface and interior of the glass material are heated to 109 to 10, respectively.
A method is disclosed in which a predetermined temperature corresponding to 4.5 poise and 1014.5 to 109 poise is set, and a temperature gradient is created between the surface portion and the inside. According to this method, both the glass material and the mold can reach a temperature below the transition point in a short time, the transfer is rapidly completed, and the molded product can be immediately removed from the mold. .
【０００４】しかしながら、上記従来技術には以下の様
な欠点がある。However, the above-mentioned conventional technology has the following drawbacks.
【０００５】すなわち、予め研削，研磨により最終形状
に近似した形状に仕上げたガラス素材を用いる場合、例
えば片面のみが非球面形状の光学素子を得る場合には、
非球面にする側のガラス素材押圧面を成形すればよく、
球面にする側のガラス素材押圧面は必ずしも非球面側と
同様に加熱する必要はない。That is, when using a glass material that has been previously ground and polished into a shape similar to the final shape, for example, when obtaining an optical element with only one surface having an aspherical shape,
All you need to do is mold the pressing surface of the glass material on the side that will be made into an aspherical surface.
The glass material pressing surface on the side to be made spherical does not necessarily need to be heated in the same way as the aspherical side.
【０００６】したがって、従来技術の様に、ガラス素材
の表面部と内部とで温度差を設けるだけでは、成形の不
必要な側のガラス素材押圧面も軟化させて流動変形させ
ることとなり、転写性および成形用型の耐久性が著しく
悪化してしまった。Therefore, simply creating a temperature difference between the surface and the inside of the glass material, as in the prior art, will also soften the pressing surface of the glass material on the side that does not require molding and cause it to flow and deform, resulting in poor transferability. Also, the durability of the molding die was significantly deteriorated.
【０００７】すなわち、ガラス素材は加熱により軟化し
て変形を生じるため、必要以上の加熱をすると、押圧直
前のガラス素材の形状が変化してしまい、より多量のガ
ラス流動を生じることにより、転写性と成形用型の耐久
性とに悪影響をおよぼしてしまうのである。In other words, the glass material softens and deforms when heated, so if the glass material is heated more than necessary, the shape of the glass material immediately before being pressed will change, and a larger amount of glass flow will occur, resulting in poor transferability. This adversely affects the durability of the mold.
【０００８】また、両面非球面形状の光学素子を得る場
合であっても、従来は非球面量の多少に拘らず、両面（
両ガラス素材押圧面）を均等に加熱，軟化しており、前
記片面非球面形状の光学素子の場合と同様の問題があっ
た。すなわち、非球面量に応じて必要な変形量が各面ご
とに決定されるが、一方の必要変形量に合わせて両面均
等に加熱を行ってしまうので、必要以上の加熱をされる
側があり、転写性と成形用型の耐久性とに悪影響をおよ
ぼしていた。さらに、不必要な加熱を行うことは、サイ
クルタイムの短縮化の妨げとなっていた。Furthermore, even when obtaining an optical element having aspherical surfaces on both sides, conventionally, regardless of the amount of aspherical surfaces, both surfaces (
Both glass material pressing surfaces) were heated and softened uniformly, and there was a problem similar to that of the optical element having an aspherical surface on one side. In other words, the necessary amount of deformation is determined for each surface according to the amount of asphericity, but since both sides are heated equally according to the required amount of deformation on one side, some sides are heated more than necessary. This had a negative effect on the transferability and the durability of the mold. Furthermore, unnecessary heating has been an obstacle to shortening the cycle time.
【０００９】因って、上記欠点を解決すべく先に本出願
人より提案した特願平１−２０６４９０号公報記載の発
明がある。該発明では、不必要な加熱により押圧直前の
ガラス素材の形状が大きく変形することを防止し、転写
性および成形用型の耐久性に優れかつサイクルタイムの
短縮化を図ることができるものである。[0009] Therefore, in order to solve the above-mentioned drawbacks, there is an invention described in Japanese Patent Application No. 1-206490 previously proposed by the present applicant. The invention prevents the shape of the glass material immediately before pressing from being significantly deformed due to unnecessary heating, provides excellent transferability and durability of the mold, and shortens cycle time. .
【００１０】すなわち、ガラス素材を加熱して軟化させ
、そのガラス素材を一対の成形用型間に搬送した後、成
形用型により押圧成形して光学素子を得る光学素子の成
形方法において、前記ガラス素材を加熱するに際し、ガ
ラス素材押圧面における所要の変形量に応じて各ガラス
素材押圧面に対する加熱をそれぞれ独立して制御するこ
ととした。[0010] That is, in an optical element molding method in which a glass material is heated and softened, the glass material is conveyed between a pair of molds, and an optical element is obtained by press-molding with the molds, the glass material is heated and softened. When heating the materials, it was decided to independently control the heating of each glass material pressing surface depending on the required amount of deformation on the glass material pressing surface.
【００１１】上記構成の発明によれば、ガラス素材を加
熱するに際し、ガラス素材押圧面における成形変形量の
多少に応じて、上側のガラス素材押圧面と下側のガラス
素材押圧面とに対する加熱量を変更する。すなわち、ガ
ラス素材と加熱ヒータとの相対距離を調整するか、また
は、上下の加熱ヒータの発熱量をそれぞれ調整して、変
形量がより大きなガラス素材押圧面に対しては加熱量を
多くし、より小さなガラス素材押圧面に対しては加熱量
をすくなくするものである。According to the invention having the above structure, when heating the glass material, the amount of heating for the upper glass material pressing surface and the lower glass material pressing surface is adjusted depending on the amount of molding deformation on the glass material pressing surface. change. That is, by adjusting the relative distance between the glass material and the heater, or by adjusting the amount of heat generated by the upper and lower heaters, the amount of heating is increased for the pressing surface of the glass material that has a larger amount of deformation. The amount of heating is reduced for a smaller pressing surface of the glass material.
【００１２】0012
【発明が解決しようとする課題】しかるに、前記特願平
１−２０６４９０号公報記載の発明においては以下の様
な問題がある。However, the invention described in Japanese Patent Application No. 1-206490 has the following problems.
【００１３】すなわち、図７に示す如く、不必要な加熱
により押圧直前のガラス素材５１の形状が大きく変形す
ることを防止し、成形用型全面にわたり十分にガラスを
流動させて当たりを確保できる反面、高温加熱側５１ａ
のガラス面は押圧成形中の冷却が遅れることにより、高
温加熱側５１ａと低温加熱側５１ｂとの間に温度差が生
じてしまい、高温加熱側５１ａのガラスの収縮量の方が
大きいためにソリ５２を生じる。このソリ５２は光学性
能に悪影響を及ぼすことがある。That is, as shown in FIG. 7, it is possible to prevent the shape of the glass material 51 immediately before pressing from being significantly deformed due to unnecessary heating, and to ensure contact by sufficiently flowing the glass over the entire surface of the mold. , high temperature heating side 51a
Due to the delay in cooling during press molding, a temperature difference occurs between the high-temperature heating side 51a and the low-temperature heating side 51b, and the amount of shrinkage of the glass on the high-temperature heating side 51a is greater, resulting in warping. 52. This warpage 52 may adversely affect optical performance.
【００１４】図８に示す如く、押圧成形時間を十分に延
長すれば、ガラス温度は成形用型温度と均温化され、高
温加熱側５１ａと低温加熱側５１ｂとの温度差は十分に
小さくなり、ソリ５２は小さくなる。As shown in FIG. 8, if the press molding time is extended sufficiently, the glass temperature becomes equal to the mold temperature, and the temperature difference between the high temperature heating side 51a and the low temperature heating side 51b becomes sufficiently small. , the sled 52 becomes smaller.
【００１５】しかしながら、例えば押圧時間が２０秒以
下の短時間プレスにおいては、高温加熱側５１ａと低温
加熱側５１ｂとの温度差を十分に低減することは困難で
ある。However, in short-time pressing, for example, when the pressing time is 20 seconds or less, it is difficult to sufficiently reduce the temperature difference between the high-temperature heating side 51a and the low-temperature heating side 51b.
【００１６】従って、ソリを低減させるためには、プレ
ス時間の延長が必要であり、生産性に制約があった。[0016] Therefore, in order to reduce warpage, it is necessary to extend the press time, which limits productivity.
【００１７】因って、本発明は上記問題点に鑑みて開発
されたもので、プレス時間の短縮が図れるとともに、ヒ
ケやソリ等の発生が低減できるガラス光学素子の成形方
法の提供を目的とする。Therefore, the present invention was developed in view of the above-mentioned problems, and aims to provide a method for molding a glass optical element that can shorten the pressing time and reduce the occurrence of sink marks, warpage, etc. do.
【００１８】[0018]
【課題を解決するための手段】本発明は、加熱軟化させ
たガラス素材を一対の成形用型間に搬送し、押圧成形に
より光学素子を得る光学素子の成形方法において、前記
ガラス素材における成形用型とガラス素材面との形状差
の大きな側の面をその変形量に応じてより高温に加熱す
る工程と、前記ガラス素材を押圧成形するに際して前記
ガラス素材面のうち高温に加熱した側と接触する成形用
型を強制的に冷却し、光学素子が転移点温度に降温した
時点で両成形面の温度差を低減する工程と、光学素子が
転移点温度以下となった後に離型する工程とから成る成
形方法である。[Means for Solving the Problems] The present invention provides an optical element molding method in which a heat-softened glass material is conveyed between a pair of molds and an optical element is obtained by pressure molding. A process of heating the side with a larger shape difference between the mold and the glass material surface to a higher temperature according to the amount of deformation, and contacting the side of the glass material surface heated to a higher temperature when press-molding the glass material. A step of forcibly cooling the mold for molding to reduce the temperature difference between both molding surfaces when the temperature of the optical element has fallen to the transition point temperature, and a step of releasing the mold after the optical element becomes below the transition point temperature. This is a molding method consisting of:
【００１９】また、前記光学素子が転移点温度に降温し
た時点で両成形面の温度差を低減する工程に次いで、ど
ちらか一方の成形用型を強制的に冷却したのち離型を行
う工程を設けた成形方法である。[0019] Further, following the step of reducing the temperature difference between both molding surfaces when the temperature of the optical element has decreased to the transition point temperature, a step of forcibly cooling one of the molding molds and then releasing the mold may be performed. This is the molding method provided.
【００２０】[0020]
【作用】本発明では、ガラス素材面における高温に加熱
した側の冷却の遅れを、そのガラス素材面に接触する成
形用型を強制的に冷却することで短時間に補正し、ガラ
スが転移点温度となった時のガラス両面間の温度差を低
減させることができる。[Function] In the present invention, the delay in cooling on the side of the glass material surface heated to a high temperature is compensated for in a short time by forcibly cooling the molding die in contact with the glass material surface, and the glass reaches the transition point. It is possible to reduce the temperature difference between both sides of the glass when the temperature reaches that temperature.
【００２１】[0021]
【実施例１】図１および図２は本実施例のガラス光学素
子の成形方法に用いる装置の断面図である。Embodiment 1 FIGS. 1 and 2 are cross-sectional views of an apparatus used in the method of molding a glass optical element according to this embodiment.
【００２２】１は予め研削・研磨により最終形状に近似
した形状に仕上げられたガラス素材で、このガラス素材
１は搬送具２を介して搬送アーム３に設置されている。
搬送アーム３は、その長手方向に進退自在であって、ガ
ラス素材１を加熱炉４内を通して成形室５内へ搬送でき
るとともに、上下動可能に設けられている。Reference numeral 1 denotes a glass material which has been previously ground and polished into a shape similar to the final shape, and this glass material 1 is placed on a transport arm 3 via a transport tool 2. The transport arm 3 is movable in its longitudinal direction, and is capable of transporting the glass material 1 through the heating furnace 4 into the molding chamber 5, and is also movable up and down.
【００２３】加熱炉４は、内面に上側加熱ヒータ６を設
置した上側ヒータ板７と、内面に下側加熱ヒータ８を設
置した下側ヒータ板９と、これら上下の両ヒータ板７，
９を側方から閉塞する二枚の側板１０，１１とから構成
されている。また、上側ヒータ板７および下側ヒータ板
９は、それぞれ支持棒１２，１３を介してシリンダ等の
駆動装置（図示省略）に接続されており、各々独立に上
下動可能に設けられている。これにより、上下の各加熱
ヒータ６，８は、搬送アーム３の上下動と相俟って、ガ
ラス素材１に対してそれぞれ独立に接近離反自在となっ
ており、ガラス素材１と加熱ヒータ６，８の相対距離を
変化させることで加熱量を調整できるように構成されて
いる。The heating furnace 4 includes an upper heater plate 7 having an upper heater 6 installed on its inner surface, a lower heater plate 9 having a lower heater 8 installed on its inner surface, both upper and lower heater plates 7,
It is composed of two side plates 10 and 11 that close off 9 from the sides. Further, the upper heater plate 7 and the lower heater plate 9 are connected to a drive device (not shown) such as a cylinder via support rods 12 and 13, respectively, and are provided so as to be able to move up and down independently. As a result, each of the upper and lower heaters 6 and 8 can move toward and away from the glass material 1 independently, together with the vertical movement of the transport arm 3, so that the glass material 1 and the heater 6, The amount of heating can be adjusted by changing the relative distance of 8.
【００２４】さらに、上下の各加熱ヒータ６，８の中央
部には、それぞれ別々に温度制御用の熱電対（図示省略
）が配設されており、各加熱ヒータ６，８をそれぞれ独
立に温度制御でき、必要な加熱量に応じて温度設定でき
るように設けられている。Further, in the center of each of the upper and lower heaters 6 and 8, thermocouples (not shown) for temperature control are separately provided, and the temperature of each heater 6 and 8 can be adjusted independently. It is provided so that it can be controlled and the temperature can be set according to the amount of heating required.
【００２５】一方、加熱炉４には、加熱炉４内で加熱軟
化されたガラス素材１を押圧成形する成形室５が連設さ
れている。そして、この成形室５内には、成形用上型１
４および成形用下型１５が、同軸上に対抗して設けられ
ている。成形用下型１５は、図示を省略した駆動装置に
連結されており、上下動可能に設けられている。On the other hand, the heating furnace 4 is connected with a molding chamber 5 in which the glass material 1 heated and softened in the heating furnace 4 is press-molded. In this molding chamber 5, there is an upper mold 1 for molding.
4 and a lower mold 15 are provided coaxially and opposingly. The lower mold 15 is connected to a drive device (not shown) and is provided to be movable up and down.
【００２６】成形用上型１４の外周部にはリング形状を
した中空の強制冷却パイプ１６が遊嵌されており、強制
冷却パイプ１６の内周面には均等間隔に複数のノズル部
１６ａが設けられている。A ring-shaped hollow forced cooling pipe 16 is loosely fitted to the outer circumference of the upper mold 14, and a plurality of nozzle portions 16a are provided at equal intervals on the inner circumference of the forced cooling pipe 16. It is being
【００２７】強制冷却パイプ１６は導入用パイプ１７に
固設されている。導入用パイプ１７は外部のＮ２ ガス
発生装置（図示省略）と接続されており、Ｎ２ ガス発
生装置からのＮ２ ガスは導入用パイプ１７を介して強
制冷却パイプ１６のノズル部１６ａより成形用上型１４
の外周面に向かって流出可能な様に構成されている。The forced cooling pipe 16 is fixed to the introduction pipe 17. The introduction pipe 17 is connected to an external N2 gas generator (not shown), and the N2 gas from the N2 gas generator is passed through the introduction pipe 17 from the nozzle portion 16a of the forced cooling pipe 16 to the upper mold for molding. 14
It is configured so that it can flow out toward the outer circumferential surface of.
【００２８】また、Ｎ２ ガスは設けられた弁およびそ
の制御装置（図示省略）により、予め設定した動作タイ
ミングに制御できる様に構成されている。[0028] Furthermore, the N2 gas is configured to be controlled at preset operation timing by a provided valve and its control device (not shown).
【００２９】以上の構成から成る装置を用いて、本実施
例では硝種ＳＫ１１からなる非球面量１００μｍの片面
非球面レンズの成形を行った。In this example, a single-sided aspherical lens made of glass SK11 and having an aspherical surface depth of 100 μm was molded using the apparatus constructed as described above.
【００３０】まず、非球面側となるガラス素材押圧面１
ａを上面にして、ガラス素材１を搬送具２を介して搬送
アーム３に設置した。ここに、ガラス素材１は、予め研
削，研磨により加工されており、非球面側となるガラス
素材押圧面１ａは近似球面に加工され、球面側となるガ
ラス素材押圧面１ｂはほぼ設計値に加工されている。し
たがって、非球面側のガラス素材押圧面１ａは変形量が
非球面量１００μｍに応じた加熱量を必要とし、球面側
のガラス素材押圧面１ｂは変形の必要がない。このため
、ガラス素材１の非球面側のガラス素材押圧面１ａと上
側加熱ヒータ６との相対距離は１０ｍｍに、ガラス素材
１の球面側のガラス素材押圧面１ｂと下側加熱ヒータ８
との相対距離は３０ｍｍにそれぞれ設定した。First, press the glass material pressing surface 1 which will be the aspherical side.
The glass material 1 was placed on the transport arm 3 via the transport tool 2 with a facing upward. Here, the glass material 1 has been processed by grinding and polishing in advance, and the glass material pressing surface 1a, which is the aspherical side, is processed into an approximate spherical surface, and the glass material pressing surface 1b, which is the spherical surface, is processed almost to the design value. has been done. Therefore, the glass material pressing surface 1a on the aspherical side requires a heating amount whose deformation amount corresponds to the aspherical amount of 100 μm, and the glass material pressing surface 1b on the spherical side does not need to be deformed. Therefore, the relative distance between the glass material pressing surface 1a on the aspherical side of the glass material 1 and the upper heater 6 is 10 mm, and the relative distance between the glass material pressing surface 1b on the spherical side of the glass material 1 and the lower heating heater 8 is 10 mm.
The relative distance from each other was set to 30 mm.
【００３１】本実施例では、このように、ガラス素材１
と加熱ヒータ６，８との相対距離を独立に変化させるこ
とで加熱量を異ならせることとしたので、加熱ヒータ６
，８は上側，下側ともに６８０℃に設定した。In this embodiment, as described above, the glass material 1
Since we decided to vary the amount of heating by independently changing the relative distance between the heater 6 and the heater 6,
, 8 was set at 680°C on both the upper and lower sides.
【００３２】ガラス素材１は、加熱炉４内にて１分間加
熱した後、搬送アーム３により成形用型１４，１５間に
搬送し、成形用下型１５を上昇させることによって押圧
成形を行った。熱電対により測定した結果、ガラス素材
１の上面は約６５５℃であり、下面は約６００℃であっ
た。The glass material 1 was heated in the heating furnace 4 for 1 minute, and then transferred between the molding molds 14 and 15 by the transport arm 3, and press molding was performed by raising the lower molding mold 15. . As a result of measurement using a thermocouple, the temperature on the upper surface of the glass material 1 was approximately 655°C, and the temperature on the lower surface was approximately 600°C.
【００３３】加圧成形直後よりＮ２ ガスを成形用上型
１４に吹きつけ、成形用上型１４の温度を低下させる。
このとき、Ｎ２ ガスの流量は、図３のグラフに示す如
く、プレス時間が１５秒経過し、光学素子がほぼ転移点
温度（５３５℃）となったときに、各ガラス素材押圧面
１ａ，１ｂ間の温度差がなくなる様に調整して成形を行
った。Immediately after pressure molding, N2 gas is blown onto the upper mold 14 to lower the temperature of the upper mold 14. At this time, as shown in the graph of FIG. 3, the flow rate of N2 gas is adjusted to the pressure of each glass material pressing surface 1a, 1b when 15 seconds have elapsed and the optical element has reached almost the transition point temperature (535°C). Molding was carried out by adjusting the temperature so that there was no difference in temperature between the two.
【００３４】本実施例によれば、従来技術では２５秒以
上要したプレス時間が、１５秒のプレス時間で同等レベ
ルの転写性を得ることができ、プレス時間を短縮しつつ
ソリのない成形レンズが成形できた。According to this embodiment, it is possible to obtain the same level of transferability with a press time of 15 seconds, whereas the conventional technique required a press time of 25 seconds or more, and a molded lens without warping can be obtained while reducing the press time. was able to be formed.
【００３５】尚、本実施例ではほぼ球面に近いプリフォ
ームをガラス素材に用いたが、本発明はこれに限定する
ものではなく、両平面のガラス素材等も同様に成形する
ことができる。In this embodiment, a nearly spherical preform was used as the glass material, but the present invention is not limited to this, and glass materials with both planes can be similarly formed.
【００３６】[0036]
【実施例２】本実施例で用いる装置は、前記実施例１で
用いた装置と同様の装置であり、装置の構成の説明は省
略する。Embodiment 2 The apparatus used in this embodiment is similar to the apparatus used in Embodiment 1, and the explanation of the structure of the apparatus will be omitted.
【００３７】本実施例におけるガラス光学素子の成形方
法は、図４のグラフに示す如く、成形用上型を冷却し、
ガラス素材の各ガラス素材押圧面１ａ，１ｂ間の温度が
転移点温度付近でほぼ等しくなったプレス時間１５秒後
も成形用上型を冷却しつづける。そして、成形用上型の
温度が成形用下型の温度よりも低くなった後に離型する
。As shown in the graph of FIG. 4, the method for molding the glass optical element in this example involves cooling the upper mold for molding,
The upper mold for molding is continued to be cooled even after 15 seconds of pressing time when the temperatures between the pressing surfaces 1a and 1b of the glass material become approximately equal near the transition point temperature. Then, the mold is released after the temperature of the upper mold becomes lower than the temperature of the lower mold.
【００３８】本実施例の成形方法により成形した光学素
子は、転移点温度以下で生じた光学素子両面間の温度差
により、一時的にソリを生じるものの、成形型からの離
型が容易となる。このソリはガラスの粘性流動が全く起
こらない温度にて生じたものであり、いわゆる一時歪に
よって生じたもので、常温まで冷却して均温化すると消
失し、ソリのない光学素子が得られる。Although the optical element molded by the molding method of this example temporarily warps due to the temperature difference between the two surfaces of the optical element that occurs below the transition point temperature, it can be easily released from the mold. . This warpage occurs at a temperature at which no viscous flow occurs in the glass, and is caused by so-called temporary strain, and disappears when the glass is cooled to room temperature and equalized, and an optical element without warp can be obtained.
【００３９】尚、本実施例では転移点温度付近以後も成
形用上型を冷却したが、本発明はこれに限定されるもの
ではなく、図５に示す如く、成形用下型１５の外周にも
第２の強制冷却パイプ２１およびＮ２ ガスの導入用パ
イプ２２を設け、転移点温度付近以後の冷却を成形用上
型１４から成形用下型１５の冷却に切替えても同様な効
果が得られる。In this example, the upper mold for molding was cooled even after the transition point temperature, but the present invention is not limited to this. As shown in FIG. The same effect can also be obtained by providing a second forced cooling pipe 21 and a pipe 22 for introducing N2 gas, and switching the cooling after the transition point temperature from the upper molding mold 14 to the cooling of the lower molding mold 15. .
【００４０】[0040]
【実施例３】本実施例で用いる装置は、前記実施例１に
おけるＮ２ ガス流出用の強制冷却パイプ１６および導
入用パイプ１７を廃止し、代わりに冷却治具３１を設け
て構成した点が異なり、他の構成部分は同一の構成から
成るもので、同一構成部分には同一番号を付してその説
明を省略する。[Embodiment 3] The apparatus used in this embodiment differs in that the forced cooling pipe 16 for N2 gas outflow and the introduction pipe 17 in Embodiment 1 are omitted, and a cooling jig 31 is provided instead. , other constituent parts have the same configuration, and the same constituent parts are given the same numbers and their explanations will be omitted.
【００４１】本実施例のガラス光学素子の成形方法は、
前記各実施例におけるＮ２ ガス吹きつけによる冷却に
代わり、冷却治具３１を成形用上型１４に接触させて冷
却を行う。The method for molding the glass optical element of this example is as follows:
Cooling is performed by bringing the cooling jig 31 into contact with the upper mold 14 instead of cooling by N2 gas blowing in each of the embodiments described above.
【００４２】以下、作用および効果は前記各実施例と同
様であり、作用および効果の説明を省略する。[0042] Hereinafter, the functions and effects are the same as in each of the embodiments described above, and the explanation of the functions and effects will be omitted.
【００４３】[0043]
【発明の効果】以上説明した様に、本発明に係るガラス
光学素子の成形方法によれば、ヒケやソリ等のガラスの
収縮に伴う転写性の劣化を防止できる。また、成形用型
の耐久性が向上する。さらに、サイクルタイムの短縮が
できる。As explained above, according to the method for molding a glass optical element according to the present invention, it is possible to prevent deterioration of transferability due to shrinkage of glass, such as sink marks and warpage. Moreover, the durability of the molding die is improved. Furthermore, cycle time can be shortened.
【図１】実施例１の断面図である。FIG. 1 is a cross-sectional view of Example 1.
【図２】実施例１の断面図である。FIG. 2 is a sectional view of Example 1.
【図３】実施例１のグラフである。FIG. 3 is a graph of Example 1.
【図４】実施例２のグラフである。FIG. 4 is a graph of Example 2.
【図５】実施例２の変形例を示す断面図である。FIG. 5 is a sectional view showing a modification of the second embodiment.
【図６】実施例３の断面図である。FIG. 6 is a cross-sectional view of Example 3.
【図７】従来例の断面図である。FIG. 7 is a sectional view of a conventional example.
【図８】従来例のグラフである。FIG. 8 is a graph of a conventional example.
１ ガラス素材 ２ 搬送具 ３ 搬送アーム ４ 加熱炉 ５ 成形室 ６ 上側加熱ヒータ ８ 下側加熱ヒータ １４ 成形用上型 １５ 成形用下型 １６ 強制冷却パイプ 1 Glass material 2 Transport equipment 3 Transfer arm 4 Heating furnace 5 Molding room 6 Upper heater 8 Lower side heater 14 Upper mold for molding 15 Lower mold for molding 16 Forced cooling pipe
Claims (2)
形用型間に搬送し、押圧成形により光学素子を得る光学
素子の成形方法において、前記ガラス素材における成形
用型とガラス素材面との形状差の大きな側の面をその変
形量に応じてより高温に加熱する工程と、前記ガラス素
材を押圧成形するに際して前記ガラス素材面のうち高温
に加熱した側と接触する成形用型を強制的に冷却し、光
学素子が転移点温度に降温した時点で両成形面の温度差
を低減する工程と、光学素子が転移点温度以下となった
後に離型する工程とから成ることを特徴とするガラス光
学素子の成形方法。1. A method for molding an optical element in which a glass material softened by heating is conveyed between a pair of molding molds and an optical element is obtained by press molding, wherein the shape of the molding mold and the surface of the glass material in the glass material is A step of heating the surface on the side with a larger difference to a higher temperature according to the amount of deformation, and a step of forcing a mold that comes into contact with the side of the glass material surface heated to a high temperature when press-molding the glass material. A glass characterized by comprising a step of cooling and reducing the temperature difference between both molding surfaces when the temperature of the optical element has decreased to the transition point temperature, and a step of releasing the mold after the optical element has become below the transition point temperature. Method of molding optical elements.
時点で両成形面の温度差を低減する工程に次いで、どち
らか一方の成形用型を強制的に冷却したのち離型を行う
工程を設けたことを特徴とする請求項１記載のガラス光
学素子の成形方法。2. After the step of reducing the temperature difference between both molding surfaces when the temperature of the optical element has decreased to the transition point temperature, the step of forcibly cooling one of the molding molds and then releasing the mold. 2. The method for molding a glass optical element according to claim 1, further comprising the step of: providing a molding method for a glass optical element;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135993A JP2975167B2 (en) | 1991-05-10 | 1991-05-10 | Glass optical element molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3135993A JP2975167B2 (en) | 1991-05-10 | 1991-05-10 | Glass optical element molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04338120A true JPH04338120A (en) | 1992-11-25 |
| JP2975167B2 JP2975167B2 (en) | 1999-11-10 |
Family
ID=15164691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3135993A Expired - Fee Related JP2975167B2 (en) | 1991-05-10 | 1991-05-10 | Glass optical element molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2975167B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5588980A (en) * | 1992-02-21 | 1996-12-31 | Olympus Optical Co., Ltd | Apparatus for molding a glass optical element with a transporting supporting member |
| US5788732A (en) * | 1995-04-20 | 1998-08-04 | Canon Kabushiki Kaisha | Optical-device forming method and apparatus |
| KR100729293B1 (en) * | 2006-04-11 | 2007-06-15 | 국제종합기계 주식회사 | Swirl chamber type diesel engine |
-
1991
- 1991-05-10 JP JP3135993A patent/JP2975167B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5588980A (en) * | 1992-02-21 | 1996-12-31 | Olympus Optical Co., Ltd | Apparatus for molding a glass optical element with a transporting supporting member |
| US5788732A (en) * | 1995-04-20 | 1998-08-04 | Canon Kabushiki Kaisha | Optical-device forming method and apparatus |
| KR100729293B1 (en) * | 2006-04-11 | 2007-06-15 | 국제종합기계 주식회사 | Swirl chamber type diesel engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2975167B2 (en) | 1999-11-10 |
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