JPS6142978A - Segment mirror - Google Patents

Segment mirror

Info

Publication number
JPS6142978A
JPS6142978A JP59164360A JP16436084A JPS6142978A JP S6142978 A JPS6142978 A JP S6142978A JP 59164360 A JP59164360 A JP 59164360A JP 16436084 A JP16436084 A JP 16436084A JP S6142978 A JPS6142978 A JP S6142978A
Authority
JP
Japan
Prior art keywords
mirror
segment
substrate
cooling
heat generation
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
JP59164360A
Other languages
Japanese (ja)
Other versions
JPH0546713B2 (en
Inventor
Naoya Hamada
直也 浜田
Osami Ichiko
市古 修身
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP59164360A priority Critical patent/JPS6142978A/en
Publication of JPS6142978A publication Critical patent/JPS6142978A/en
Publication of JPH0546713B2 publication Critical patent/JPH0546713B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02Constructional details
    • H01S3/04Arrangements for thermal management
    • H01S3/0401Arrangements for thermal management of optical elements being part of laser resonator, e.g. windows, mirrors, lenses
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02Constructional details
    • H01S3/04Arrangements for thermal management
    • H01S3/0407Liquid cooling, e.g. by water

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Laser Beam Processing (AREA)

Abstract

PURPOSE:To obtain the stable performance of laser condensation even in long- time use by a method wherein a mirror substrate is directly cooled with water by interposing a material of good thermal conductivity between the substrate and segments, and the mirror surface is cooled by gas spraying. CONSTITUTION:When a laser beam comes into a segment mirror, heat generation is caused by the photo absorption to the boundary of each segment 2 constituting the segment mirror and to the segment 2 itsselt. This portion of heat generation is first removed by emission loss to some degree by means of a cooling gas 12 spouted through a cooling gas pipe 6. Further, the portion of heat generation transferred to the mirror by thermal conduction is transmitted to the mirror bustrate 1 via material 9 such as Ag solder which has a good thermal conductivity. Here, a cooling water path 4 is provided between a mirror holder 3 and the mirror substrate 1, and the cooling water 11 directly cools the periphery of the substrate 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はレーザ加工装置における集光ミラーに関し、特
にその冷却構造に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a condensing mirror in a laser processing device, and particularly to a cooling structure thereof.

〔従来の技術〕[Conventional technology]

鉄鋼の熱処理等、金鹿のレーザ熱処理の集光ミラーとし
て、第3図に示されるようなセグメントミラー(インテ
グレーションミラー)がよく用いられる。このミラーは
、第3図に示すように、入射したレーザ光を受ける各セ
グミン1へ2の傾きが1つ1つ調整されて、それぞれの
反射光がセグメントミラーの焦点位!(図中C点)にお
いて、すべて重なるようになっている。その結果、焦点
Cにおいて、レーザビームはミラーセグメントの形状に
対応した光束となり、かつその位置での断面エネルギ分
布はほぼ一様となる。
A segment mirror (integration mirror) as shown in FIG. 3 is often used as a condensing mirror for laser heat treatment of gold deer, such as heat treatment of steel. As shown in FIG. 3, the inclination of each segment 1 to 2 that receives the incident laser beam is adjusted one by one, so that each reflected light is aligned to the focal point of the segment mirror. They all overlap at point C (point C in the figure). As a result, at the focal point C, the laser beam becomes a luminous flux corresponding to the shape of the mirror segment, and the cross-sectional energy distribution at that position becomes almost uniform.

さて、一様に大出力レーザビームを伝送、集光する反射
鏡は高反射率を有するが、その上限値は99%程度であ
り、若干のビーム吸収が存在する。
Now, a reflecting mirror that uniformly transmits and focuses a high-output laser beam has a high reflectance, but its upper limit is about 99%, and there is some beam absorption.

更にセグメントミラーの場合、複数のセグメントをはり
あわせていることから、それらの境界でのエネルギ吸収
が大きく1反射率の上限は95〜96%である。その結
果1反射鏡の冷却を行なわないと、温度上昇に起因する
熱歪からレーザ集光特性に変動をきたし、加工特性の安
定性が得られない、という問題点があった。
Furthermore, in the case of a segment mirror, since a plurality of segments are glued together, energy absorption at the boundaries between them is large, and the upper limit of one reflectance is 95 to 96%. As a result, unless the reflecting mirror 1 is cooled, thermal distortion caused by temperature rise causes fluctuations in laser focusing characteristics, making it impossible to obtain stability in processing characteristics.

こういった問題点に対処するため、従来は特開昭58−
44486号報に開示されているような。
In order to deal with these problems, previously Japanese Patent Application Laid-Open No. 58-
As disclosed in No. 44486.

ガス吹付は方式によるミラー表面冷却の方法が提案され
ている。第4図は、この方式の説明図で。
A method of cooling the mirror surface using gas blowing has been proposed. Figure 4 is an explanatory diagram of this method.

伝送、集光用ミラーの表面にガスノズル7からガス吹付
けを行ない、放射損失の増大化によってミラー冷却を行
なうものである。
Gas is sprayed from a gas nozzle 7 onto the surface of the transmission and condensing mirror to cool the mirror by increasing radiation loss.

更に従来法の他の例としては、ミラー表面をクールシー
トを介して間接水冷を行なう方法も提案されている。
Furthermore, as another example of the conventional method, a method has been proposed in which the mirror surface is indirectly cooled with water via a cool sheet.

〔発明が解決しようとする問題〕[Problem that the invention seeks to solve]

しかしながら、セグメントミラーの場合、前述の如くレ
ーザ吸収率が通常の反射鏡より大きいためより高い冷却
能が要求され、従来の方式では、長時間安定に一定のレ
ーザ集光性能が得られないという問題点があった。
However, in the case of segment mirrors, as mentioned above, the laser absorption rate is higher than that of ordinary reflecting mirrors, so higher cooling capacity is required, and the conventional method has the problem of not being able to stably maintain constant laser focusing performance over a long period of time. There was a point.

本発明は、大出力レーザビームをセグメントミラーで集
光するにあたって、ビーム吸収による発熱分を効率良く
冷却することによって、長時間の使用に際しても安定し
たレーザ集光性能を得るためになされたものである。
The present invention was made in order to obtain stable laser focusing performance even during long-term use by efficiently cooling the heat generated by beam absorption when focusing a high-power laser beam with a segment mirror. be.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の特徴とするところは、レーザビームの集光ミラ
ーとして使用されるセグメントーミラーにおいて: ミ
ラー基板とセグメントの間に熱伝導性の良い材料を介在
させ基板を直接水冷するとともに、ミラー表面をガス吹
付けにより冷却するようにしたことにある。
The features of the present invention are that in a segment mirror used as a condensing mirror for a laser beam, a material with good thermal conductivity is interposed between the mirror substrate and the segment, the substrate is directly cooled with water, and the mirror surface is The reason is that it is cooled by blowing gas.

〔作用〕[Effect]

本発明の作用について1図面に基いて説明する。 The operation of the present invention will be explained based on one drawing.

第1図は、本発明にかかるセグメントミラーの主要部を
示す断面図である。レーザビームがセグメントミラーに
入射すると、セグメントーミラーを構成する各セグメン
ト2の境界での吸光、ならびにセグメント自体の吸光に
より発熱が生ずる。
FIG. 1 is a sectional view showing the main parts of a segment mirror according to the present invention. When a laser beam is incident on a segment mirror, heat is generated due to light absorption at the boundaries of each segment 2 constituting the segment mirror and light absorption by the segment itself.

この発熱分は、まず冷却用ガス配管6より噴出される冷
却用ガス12により、ある程度は放射損失により除去さ
れる。
This exothermic component is first removed by the cooling gas 12 ejected from the cooling gas pipe 6 due to radiation loss.

更に、熱伝導によってミラー内部に伝導した発熱分は、
銀ロウ等熱伝導性の良い材料9を介してミラー基板1に
伝達される。ここで、ミラーホルダ3とミラー基板1と
の間には冷却水流路4が設けられ、冷却水11によりミ
ラー基板1の周囲を直接冷却する。
Furthermore, the heat generated inside the mirror by thermal conduction is
It is transmitted to the mirror substrate 1 via a material 9 with good thermal conductivity such as silver solder. Here, a cooling water flow path 4 is provided between the mirror holder 3 and the mirror substrate 1, and the area around the mirror substrate 1 is directly cooled by the cooling water 11.

なお、冷却水流路4の付近には、0リング5が設置され
、ミラー表面に冷却水11がもれないような構造となっ
ている。
Note that an O-ring 5 is installed near the cooling water flow path 4, so that the structure is such that the cooling water 11 does not leak onto the mirror surface.

したがって、セグメントミラー表面で発生した熱は、表
面からの放射損失とミラー基板1からの冷却水による抜
熱によって、効率良くとり去られ、セグメントミラーの
過熱が防止される。
Therefore, heat generated on the surface of the segment mirror is efficiently removed by radiation loss from the surface and heat removed by the cooling water from the mirror substrate 1, and overheating of the segment mirror is prevented.

〔実施例〕〔Example〕

本発明の実施例として、l0KWレ一ザ加工機用セグメ
ントミラーに用いた冷却構造の例を示す。
As an embodiment of the present invention, an example of a cooling structure used in a segment mirror for a 10KW laser processing machine will be shown.

ミラー基板は銅製の凹面鏡を用い、セグメントは0.5
インチ角の銅ミラーに金蒸着をほどこしたものであり、
焦点距蒲は600田である。形状は第1図の通りで、冷
却用ガス(12)はN2ガスを用いた0以上の構成にて
、セグメン1−2に熱電対を装着した上、レーザ出力L
OKWにて10分間の連続加工を行ない温度監視をした
ところ。
The mirror board uses a copper concave mirror, and the segment is 0.5
It is an inch square copper mirror coated with gold vapor deposition.
The focal length is 600mm. The shape is as shown in Figure 1, with a configuration of 0 or more using N2 gas as the cooling gas (12), a thermocouple attached to segment 1-2, and laser output L.
The temperature was monitored after 10 minutes of continuous processing at OKW.

セグメント2の最高到達温度は40℃であり、集光性能
にも変動は見られなかった。
The maximum temperature reached by segment 2 was 40° C., and no change was observed in the light gathering performance.

第2図は本発明の別の実施例を示したものであり、ミラ
ー基板1の直接冷却について、ミラー基板1本体に冷却
水流路4を設は直接冷却を行なう構成どしたものである
FIG. 2 shows another embodiment of the present invention, in which a cooling water passage 4 is provided in the main body of the mirror substrate 1 for direct cooling of the mirror substrate 1.

〔効果〕〔effect〕

実施例において述べたように、本発明による冷却構造を
用いれば、長時間のセグメントミラーによるレーザ加工
に際してもミラーの過熱、ならびにそれに起因するミラ
ー歪も、更には集光性能の変動をも防止することができ
、安定したレーザ加工性能を得ることが可能である。
As described in the examples, by using the cooling structure according to the present invention, even during long-time laser processing using a segment mirror, overheating of the mirror, mirror distortion caused by this, and furthermore, fluctuations in light focusing performance can be prevented. It is possible to obtain stable laser processing performance.

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

第1図および第2図は、それぞれ本発明の一実例である
セグメントミラーの主要部を示す断面図第3図は従来よ
り知られているセグメントミラーの主要部外観を示す斜
視図、第4図は、従来のセグメントミラーの、特に冷却
系の構成を示す縦断面図である。 1:セグメントミラー基板   2:セグメント3:ミ
ラーホルダー      4=冷却水流路5:Oリング
     6:冷却用ガス配管7、:冷却用ガスノズル
   8:全反射ミラー9:熱伝導材      10
:レーザビーム11:冷却水      12:冷却用
ガス銅1図 東2図 東3図 穿4図 手続補正書 昭和59年 9月 6日 2、発明の名称 セグメントミラー 3、補正をする者 事件との関係   特許出願人 住所    東京都千代田区大手町二丁目6番3号名称
    (665)新日本製鐵株式會社代表者 武 1
) 豊 4、代理人   〒103  電話 03−864−6
052住所    東京都中央区東日本橋2丁目27番
6号6、補正の内容 明細書第6頁第17〜1β行の「セグメントミラー」を
「レーザビーム伝送・集光ミラー」と訂正する。
1 and 2 are cross-sectional views showing the main parts of a segment mirror that is an example of the present invention. FIG. 3 is a perspective view showing the appearance of the main parts of a conventionally known segment mirror. 1 is a vertical cross-sectional view showing the configuration of a conventional segment mirror, particularly the cooling system. 1: Segment mirror substrate 2: Segment 3: Mirror holder 4 = Cooling water flow path 5: O ring 6: Cooling gas piping 7, : Cooling gas nozzle 8: Total reflection mirror 9: Thermal conductive material 10
: Laser beam 11: Cooling water 12: Cooling gas Copper 1 Figure East 2 Figure East 3 Figure Drill 4 Procedural amendment September 6, 1982 2, Title of invention Segment mirror 3, Amendment person case Related Patent Applicant Address 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (665) Nippon Steel Corporation Representative Takeshi 1
) Yutaka 4, Agent 103 Telephone 03-864-6
052 Address: 2-27-6, Higashi Nihonbashi, Chuo-ku, Tokyo, "Segment mirror" on page 6, lines 17-1β of the statement of contents of the amendment is corrected to "laser beam transmission/collecting mirror."

Claims (1)

【特許請求の範囲】[Claims] レーザビームの集光ミラーとして使用されるレーザ加工
機用のセグメントミラーにおいて:ミラー基板とセグメ
ントの間に熱伝導性の良い材料を介在させ、ミラー基板
を直接水冷する冷却機構をミラー基板に付設するととも
に、ミラー表面をガス吹付けにより冷却する冷却ガス噴
射装置を設けたことを特徴とするレーザ加工機用のセグ
メントミラー。
In segment mirrors for laser processing machines that are used as laser beam focusing mirrors: A material with good thermal conductivity is interposed between the mirror substrate and the segments, and a cooling mechanism that directly cools the mirror substrate with water is attached to the mirror substrate. A segment mirror for a laser processing machine, further comprising a cooling gas injection device that cools the mirror surface by blowing gas.
JP59164360A 1984-08-06 1984-08-06 Segment mirror Granted JPS6142978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59164360A JPS6142978A (en) 1984-08-06 1984-08-06 Segment mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59164360A JPS6142978A (en) 1984-08-06 1984-08-06 Segment mirror

Publications (2)

Publication Number Publication Date
JPS6142978A true JPS6142978A (en) 1986-03-01
JPH0546713B2 JPH0546713B2 (en) 1993-07-14

Family

ID=15791665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59164360A Granted JPS6142978A (en) 1984-08-06 1984-08-06 Segment mirror

Country Status (1)

Country Link
JP (1) JPS6142978A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6377178A (en) * 1986-09-19 1988-04-07 Fanuc Ltd Pumping reflector for laser
JP2022084640A (en) * 2015-01-22 2022-06-07 カール・ツァイス・エスエムティー・ゲーエムベーハー Method for producing reflective optical element, reflective optical element, and use of reflective optical element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6377178A (en) * 1986-09-19 1988-04-07 Fanuc Ltd Pumping reflector for laser
JP2022084640A (en) * 2015-01-22 2022-06-07 カール・ツァイス・エスエムティー・ゲーエムベーハー Method for producing reflective optical element, reflective optical element, and use of reflective optical element

Also Published As

Publication number Publication date
JPH0546713B2 (en) 1993-07-14

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