JPH054829A - Method for manufacturing silica-based glass rod lens - Google Patents
Method for manufacturing silica-based glass rod lensInfo
- Publication number
- JPH054829A JPH054829A JP17773291A JP17773291A JPH054829A JP H054829 A JPH054829 A JP H054829A JP 17773291 A JP17773291 A JP 17773291A JP 17773291 A JP17773291 A JP 17773291A JP H054829 A JPH054829 A JP H054829A
- Authority
- JP
- Japan
- Prior art keywords
- rod
- rod lens
- based glass
- glass
- glass rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1453—Thermal after-treatment of the shaped article, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1469—Means for changing or stabilising the shape or form of the shaped article or deposit
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Glass Melting And Manufacturing (AREA)
Abstract
(57)【要約】
【目的】 屈折率分布にゆらぎのないＧＩ形のＳｉＯ2
系ガラスロッドレンズを得る方法を提供する。
【構成】 ＶＡＤ法によって、ＧｅＯ2 −ＳｉＯ2 ガラ
スからなる多孔質プリフォーム３を得、これを透明ガラ
ス化してロッド状にする。このロッドを延伸して所定の
ロッドレンズ径にする。その後、延伸されたロッド先端
部をアーク放電によって熱処理してＧｅを熱拡散させて
屈折率プロファイルがスムーズな、ゆらぎを緩和したロ
ッドレンズとする。
(57) [Abstract] [Purpose] GI-type SiO 2 with no fluctuation in refractive index distribution
Provided is a method for obtaining a glass rod lens. [Structure] A porous preform 3 made of GeO 2 —SiO 2 glass is obtained by the VAD method, and this is made into a transparent glass into a rod shape. This rod is stretched to a predetermined rod lens diameter. Then, the extended rod tip is heat-treated by arc discharge to thermally diffuse Ge to obtain a rod lens having a smooth refractive index profile and reduced fluctuations.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ＧＩ形のシリカ（Ｓ
ｉＯ2 ）系ガラスロッドレンズの製造方法に関するもの
で、屈折率分布にゆらぎのないスムーズなものを提供す
る。This invention relates to GI type silica (S
The present invention relates to a method for manufacturing an iO 2 ) based glass rod lens, which provides a smooth refractive index distribution without fluctuation.
【０００２】[0002]
【従来の技術】ＳｉＯ2 系ガラスのロッドレンズは、医
療用の極細径イメージファイバの対物レンズとして、ま
た、工業用としても狭い管路などの観察に用いられてい
る。従来のこの種のロッドレンズの製法は、以下のよう
になされていた。
（１）ＶＡＤ法、外付け法、ＭＣＶＤ法などによりＧｅ
がドープされたＧＩ形のプリフォームを作る。
（２）このプリフォームを加熱炉で所定の径に延伸して
ロッドとする。
（３）ロツドを所定の長さに切断する。
（４）所定の長さに切断されたロッドの両端面を研磨す
る。 2. Description of the Related Art A rod lens made of SiO 2 glass is used as an objective lens for an extremely fine image fiber for medical purposes and also for industrial purposes for observing narrow conduits. The conventional manufacturing method of this type of rod lens has been as follows. (1) Ge by VAD method, external attachment method, MCVD method, etc.
1. Make a GI type preform doped with. (2) This preform is drawn to a predetermined diameter in a heating furnace to form a rod. (3) Cut the rod into a predetermined length. (4) Polish both end faces of the rod cut into a predetermined length.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、この方
法では（１）のプリフォーム製造工程中に生じる温度分
布のために、得られたロッドに屈折率のゆらぎが存在し
てプロファイルが滑らかではなく、そのため光を入射す
ると回折が生じるという問題があつた。However, in this method, due to the temperature distribution generated during the preform manufacturing step (1), fluctuations in the refractive index are present in the obtained rod and the profile is not smooth, Therefore, there is a problem that diffraction occurs when light is incident.
【０００４】[0004]
【課題を解決するための手段】この発明は、以上の観点
からロッドに内在するゆらぎを除去して屈折率プロファ
イルのスムーズなＳｉＯ2 系ガラスロッドレンズを提供
しようとするもので、その特徴とする請求項１記載の発
明は、火炎加水分解法および熱酸化反応により得られる
ＧＩ形ＧｅドープＳｉＯ2多孔質ガラス体を透明ガラス
化してロツドとなし、このロッド先端部の所定長さを熱
処理したのち、この熱処理された部分を切断して、その
両端面を研磨することにある。なお、火炎加水分解法お
よび熱酸化反応によるＧＩ形ＧｅドープＳｉＯ2 多孔質
ガラス体の製法の具体例としては、ＶＡＤ法もしくは外
付け法があげられる。さらに、ロッドを熱処理する手段
としてはアーク放電もしくはマイクロトーチがあげられ
る。In view of the above, the present invention is intended to provide a SiO 2 glass rod lens having a smooth refractive index profile by removing the fluctuations inherent in the rod. According to the first aspect of the present invention, the GI-type Ge-doped SiO 2 porous glass body obtained by the flame hydrolysis method and the thermal oxidation reaction is made into a transparent glass to form a rod. The purpose is to cut the heat-treated part and polish both end faces. A specific example of the method for producing the GI-type Ge-doped SiO 2 porous glass body by the flame hydrolysis method and the thermal oxidation reaction is the VAD method or the external attachment method. Further, as a means for heat-treating the rod, there is an arc discharge or a micro torch.
【０００５】[0005]
【作用】ＶＡＤ法もしくは外付け法によつて得られるＧ
ｅドープＳｉＯ2 ガラスロッドは、ロッドレンズ径に延
伸されて元のロッド径よりも細径にはなされても依然と
して屈折率分布にゆらぎを有しているが、熱処理工程を
経ることによつてスムーズな屈折率分布をもったものと
なる。[Function] G obtained by VAD method or external method
The e-doped SiO 2 glass rod still has fluctuations in the refractive index distribution even if it is stretched to the rod lens diameter and made smaller than the original rod diameter, but it is smooth due to the heat treatment process. It has a wide refractive index distribution.
【０００６】[0006]
【実施例】図１に示すＶＡＤ法によりＧｅドープＳｉＯ
2 多孔質ガラスプリフォームを得た。図において、１は
出発部材となるＳｉＯ2 ガラスロッドで、その軸の周り
に２０ｒｐｍで回転されるとともに、５ｍｍ／分の速度
で引上げられる。２はこのロツド下端に向けてロッド軸
に対して、およそ４５度の角度をもって対峙された同心
多重管バーナで、その中心１層目にＧｅＣｌ4 とＳｉＣ
ｌ4 とをそれぞれ３００ｓｃｃｍと１０００ｓｃｃｍ、
２層目にはＡｒシールガス５００ｓｃｃｍ、３層目には
Ｈ2 を３０００ｓｃｃｍ、４層目にはＡｒシールガスを
１０００ｓｃｃｍ、５層目にはＯ2 を２０００ｓｃｃｍ
供給し、火炎加水分解反応および熱酸化反応によりロッ
ド先端に直径４０ｍｍのＧｅＯ2 −ＳｉＯ2 ガラス微粒
子からなる多孔質プリフォーム３を形成した。EXAMPLES Ge-doped SiO 2 by the VAD method shown in FIG.
Two porous glass preforms were obtained. In the figure, 1 is a SiO 2 glass rod as a starting member, which is rotated at 20 rpm around its axis and pulled up at a speed of 5 mm / min. Reference numeral 2 is a concentric multi-tube burner facing the lower end of the rod at an angle of about 45 degrees with respect to the rod axis, and GeCl 4 and SiC are formed in the center first layer.
l 4 and 300 sccm and 1000 sccm, respectively.
Ar seal gas is 500 sccm for the second layer, H 2 is 3000 sccm for the third layer, Ar seal gas is 1000 sccm for the fourth layer, and O 2 is 2000 sccm for the fifth layer.
Then, the porous preform 3 made of GeO 2 —SiO 2 glass fine particles having a diameter of 40 mm was formed at the tip of the rod by the flame hydrolysis reaction and the thermal oxidation reaction.
【０００７】このプリフォーム３を８００℃の５容積％
の塩素ガス雰囲気で脱水したのち、１４００℃のＨｅガ
ス雰囲気で透明ガラス化して直径２０ｍｍの透明ガラス
ロッドとした。このロッドを延伸して直径０．５ｍｍの
ロッドとなし、その先端部付近をアーク放電により熱処
理した。最後に、このロッドを長さ３ｍｍに切断して、
その両端面を研磨してロッドレンズとした。This preform 3 is 5% by volume at 800 ° C.
After dewatering in a chlorine gas atmosphere of 1, a transparent glass rod having a diameter of 20 mm was formed by transparent vitrification in a He gas atmosphere of 1400 ° C. This rod was stretched to form a rod having a diameter of 0.5 mm, and the vicinity of its tip was heat treated by arc discharge. Finally, cut this rod to a length of 3 mm,
Both end faces were polished to obtain rod lenses.
【０００８】こうして得られたロッドレンズは、スムー
ズな屈折率分布を有し、これに光を入射させたところ回
折が生じることもなく良好な結果が得られた。また、こ
のロッドレンズをイメージファイバに接続して画像伝送
を行ったところ、収差が小さく画質の向上を図ることが
できた。なお、この実施例では、ロッドの熱処理をアー
ク放電によって行う例を示したが、これに限定されずマ
イクロトーチを用いて熱処理しても効果的である。The rod lens thus obtained had a smooth refractive index distribution, and when light was incident on this rod lens, good results were obtained without diffraction. Also, when this rod lens was connected to an image fiber to perform image transmission, the aberration was small and the image quality could be improved. In addition, in this embodiment, an example in which the heat treatment of the rod is performed by arc discharge is shown, but the present invention is not limited to this, and heat treatment using a micro torch is also effective.
【０００９】[0009]
【発明の効果】この発明方法は、ＶＡＤ法もしくは外付
け法によつて得られたＧＩ形のＧｅドープＳｉＯ2 ガラ
スロッドを、所定のロッドレンズ径に延伸したのちに、
熱処理してスムーズな屈折率分布のものとするので、回
折現象を除去できるだけでなく収差も小さくなるため画
質の向上を図ることができる。According to the method of the present invention, the GI type Ge-doped SiO 2 glass rod obtained by the VAD method or the external attachment method is stretched to a predetermined rod lens diameter,
Since the heat treatment is applied to obtain a smooth refractive index distribution, not only the diffraction phenomenon can be removed but also the aberration is reduced, so that the image quality can be improved.
【図面の簡単な説明】[Brief description of drawings]
【図１】この発明方法に用いられるロッドレンズ用のプ
リフォームをＶＡＤ法によつて得る様子を示す説明図で
ある。FIG. 1 is an explanatory view showing a manner in which a preform for a rod lens used in the method of the present invention is obtained by a VAD method.
【符号の説明】 １ 出発部材 ２ 同心多重管バーナ ３ ＧｅＯ2 −ＳｉＯ2 からなる多孔質のプリフォーム[Explanation of Codes] 1 Starting member 2 Concentric multi-tube burner 3 Porous preform made of GeO 2 -SiO 2
Claims (3)
得られるＧＩ形ＧｅドープＳｉＯ2 多孔質ガラス体を透
明ガラス化してロッドとなし、このロッドを溶融延伸し
て所定のロッドレンズ径になし、この所定の径になされ
たロッド先端部の所定長を熱処理したのち、この熱処理
された部分を切断して、その両端面を研磨することを特
徴とするシリカ系ガラスロッドレンズの製造方法。1. A GI type Ge-doped SiO 2 porous glass body obtained by a flame hydrolysis method and a thermal oxidation reaction is formed into a transparent vitreous body to form a rod, and the rod is melt-stretched to a predetermined rod lens diameter. A method for manufacturing a silica-based glass rod lens, which comprises heat-treating a predetermined length of a rod tip portion having a predetermined diameter, cutting the heat-treated portion, and polishing both end surfaces thereof.
ＧＩ形ＧｅドープＳｉＯ2 多孔質ガラス体の製法がＶＡ
Ｄ法もしくは外付け法であることを特徴とするシリカ系
ガラスロッドレンズの製造方法。2. A method for producing a GI-type Ge-doped SiO 2 porous glass body by a flame hydrolysis method and a thermal oxidation reaction is VA.
A method for producing a silica-based glass rod lens, which is a method D or an external method.
ロトーチであることを特徴とするシリカ系ガラスロッド
レンズの製造方法。3. A method of manufacturing a silica-based glass rod lens, wherein the heat treatment means is an arc discharge or a micro torch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17773291A JPH054829A (en) | 1991-06-24 | 1991-06-24 | Method for manufacturing silica-based glass rod lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17773291A JPH054829A (en) | 1991-06-24 | 1991-06-24 | Method for manufacturing silica-based glass rod lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH054829A true JPH054829A (en) | 1993-01-14 |
Family
ID=16036156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17773291A Pending JPH054829A (en) | 1991-06-24 | 1991-06-24 | Method for manufacturing silica-based glass rod lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH054829A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145040A (en) * | 1981-03-02 | 1982-09-07 | Nippon Telegr & Teleph Corp <Ntt> | Production of rod lens |
| JPS63162538A (en) * | 1986-12-24 | 1988-07-06 | Fujikura Ltd | Production of quartz rod lens |
-
1991
- 1991-06-24 JP JP17773291A patent/JPH054829A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145040A (en) * | 1981-03-02 | 1982-09-07 | Nippon Telegr & Teleph Corp <Ntt> | Production of rod lens |
| JPS63162538A (en) * | 1986-12-24 | 1988-07-06 | Fujikura Ltd | Production of quartz rod lens |
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