JP6538375B2 - Method of flattening hard and brittle substrate - Google Patents

Method of flattening hard and brittle substrate Download PDF

Info

Publication number
JP6538375B2
JP6538375B2 JP2015044338A JP2015044338A JP6538375B2 JP 6538375 B2 JP6538375 B2 JP 6538375B2 JP 2015044338 A JP2015044338 A JP 2015044338A JP 2015044338 A JP2015044338 A JP 2015044338A JP 6538375 B2 JP6538375 B2 JP 6538375B2
Authority
JP
Japan
Prior art keywords
hard
brittle substrate
grinding
chuck
substrate
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.)
Active
Application number
JP2015044338A
Other languages
Japanese (ja)
Other versions
JP2016163914A5 (en
JP2016163914A (en
Inventor
山本 栄一
栄一 山本
順行 持丸
順行 持丸
利洋 伊東
利洋 伊東
吉田 裕
吉田  裕
暁 伊藤
暁 伊藤
Original Assignee
株式会社岡本工作機械製作所
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 株式会社岡本工作機械製作所 filed Critical 株式会社岡本工作機械製作所
Priority to JP2015044338A priority Critical patent/JP6538375B2/en
Publication of JP2016163914A publication Critical patent/JP2016163914A/en
Publication of JP2016163914A5 publication Critical patent/JP2016163914A5/ja
Application granted granted Critical
Publication of JP6538375B2 publication Critical patent/JP6538375B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Jigs For Machine Tools (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Description

本発明は、サファイア基板、炭化珪素(SiC)基板、窒化ガリウム(GaN)基板、アルミナセラミック基板等の結晶配向を有する硬脆性基板の表面を平坦化加工する方法に関する。本発明の方法によれば、反りの小さい平坦化加工された硬脆性基板を得ることができる。   The present invention relates to a method of planarizing a surface of a hard and brittle substrate having a crystal orientation such as a sapphire substrate, a silicon carbide (SiC) substrate, a gallium nitride (GaN) substrate, and an alumina ceramic substrate. According to the method of the present invention, it is possible to obtain a flattened hard-brittle substrate with small warpage.

結晶配向を有する硬脆性基板は、LED、パワー半導体装置、抵抗器センサー等の基板として利用されている。この硬脆性基板は、オリフラが研削加工されたインゴットブロックを切断加工して得られた円盤状基板の反りが6インチ径基板でウエハ反り高さ5〜6mmと大きいので、この硬脆性基板の表裏両面を研削加工して平坦化加工基板とする沢山の加工方法、例えば、基板両面を同時に研磨加工する両面同時研磨方法、または、基板の表面を研削加工した後、基板裏面を研削加工する単葉研削加工方法が提案されている。   Hard and brittle substrates having crystal orientation are used as substrates for LEDs, power semiconductor devices, resistor sensors, and the like. In this hard and brittle substrate, the warpage of a disk-like substrate obtained by cutting an ingot block with an ori-grind is as large as a 6-inch diameter substrate and a wafer warpage height of 5 to 6 mm. A number of processing methods to grind both surfaces to make a planarized substrate, such as simultaneous grinding on both surfaces simultaneously, or single-leaf grinding to grind the back surface of the substrate after grinding the surface of the substrate A processing method has been proposed.

例えば、特開2014−192307号公報(特許文献1)は、サファイア単結晶インゴットから切り出したサファイア基板の両面を研削して平坦なサファイア基板に仕上げるサファイア基板の平坦加工方法であって、
サファイア単結晶インゴットから切り出したサファイア基板を熱処理する熱処理工程と、
該熱処理工程を経たサファイア基板の第1の面を、保持面を有するステージ上に液体樹脂を介在して載置させるウェーハ(基板)載置工程と、
該ウェーハ載置工程ののち、該液体樹脂を硬化させる樹脂硬化工程と、
該樹脂硬化工程ののち、サファイア基板の該第1の面の反対面となる第2の面を研削する第1の研削工程と、
該第1の研削工程ののち、該第1の面に貼着される硬化した該液体樹脂を剥離する樹脂剥離工程と、
該樹脂剥離工程ののちサファイア基板の該第1の面を研削する第2の研削工程と、
を含むサファイア基板の平坦加工方法を提案する。
For example, JP-A-2014-192307 (Patent Document 1) is a method of planarizing a sapphire substrate in which both surfaces of a sapphire substrate cut out from a sapphire single crystal ingot are ground to finish a flat sapphire substrate,
A heat treatment step of heat treating a sapphire substrate cut out of a sapphire single crystal ingot;
A wafer (substrate) placing step of placing the first surface of the sapphire substrate which has passed through the heat treatment step with a liquid resin interposed on a stage having a holding surface;
A resin curing step of curing the liquid resin after the wafer placing step;
A first grinding step of grinding a second surface opposite to the first surface of the sapphire substrate after the resin curing step;
A resin peeling step of peeling the cured liquid resin stuck to the first surface after the first grinding step;
A second grinding step of grinding the first surface of the sapphire substrate after the resin peeling step;
We propose a planar processing method of sapphire substrate including.

また、特開2014−58444号公報(特許文献2)は、
シート又はディスクからなる単結晶体の結晶方位を解析する工程と、
前記単結晶体の選択された結晶方向と前記単結晶体の第1の主外面の面に沿う結晶方向の投影との間の方位差角を計算する工程と、
前記の結晶方位を解析する工程と前記の方位差角を計算する工程に基づいて、前記第1の主外面の少なくとも一部から材料を研削除去して前記方位差角を変化させる工程であって、初期の第1の主外面から材料を研削除去する前に前記方位差角が0.05°より大きい工程と
を含む、単結晶体の結晶方位を変化させる方法を提案する。
Moreover, Japanese Patent Laid-Open No. 2014-58444 (Patent Document 2) is
Analyzing the crystal orientation of a single crystal made of a sheet or a disc;
Calculating an misorientation angle between the selected crystal orientation of the single crystal and the projection of the crystal orientation along the plane of the first major outer surface of the single crystal;
A step of grinding and removing material from at least a portion of the first main outer surface to change the misorientation angle based on the step of analyzing the crystal orientation and the step of calculating the misorientation angle; The present invention proposes a method of changing the crystal orientation of a single crystal, which includes the steps of: said misorientation angle being larger than 0.05 ° before grinding and removing material from the initial first main outer surface.

さらに、特許第5417655号明細書(特許文献3)は、互いに接合される板状の第1および第2の対象物同士の対向配置された状態での相対的な傾きを調整する傾き調整方法において、
複数の電極が形成された前記第1の対象物(被加工物)を用意する工程と、
前記第1の対象物に対向配置されたときに該第1の対象物の各電極のいずれかと対向して対を成す電極が複数形成された前記第2の対象物を用意する工程と、
前記第1および第2の対象物の前記各電極それぞれにより複数の電極対を形成するように、前記第1の対象物と前記第2の対象物とを対向配置する工程と、
前記第1および第2の対象物を近接して対向配置した状態で、複数の前記電極対の静電容量を検出することにより、前記各静電容量の値から非接触で対向配置された前記第1および第2の対象物同士の相対的な傾きを検出する検出工程と、
前記第1および第2の対象物の一方を基準としたときの他方の傾きを傾き調整手段によって変更して、前記検出工程で検出した前記第1および第2の対象物同士の相対的な傾きを所定の傾きに調整する傾き調整工程とを含む
ことを特徴とする傾き調整方法を開示する。
Furthermore, Japanese Patent No. 5417655 (patent document 3) is an inclination adjustment method for adjusting the relative inclination of the plate-shaped first and second objects to be joined to each other in a state where they are disposed facing each other. ,
Providing the first object (workpiece) on which a plurality of electrodes are formed;
Providing the second object in which a plurality of electrodes are formed to be opposed to any one of the electrodes of the first object when the first object is disposed to face the first object;
Opposingly arranging the first object and the second object such that a plurality of electrode pairs are formed by the respective electrodes of the first and second objects;
In a state where the first and second objects are closely disposed facing each other, the capacitances of the plurality of electrode pairs are detected, so that the values of the respective capacitances are disposed in a noncontacting manner oppositely. Detecting the relative tilt of the first and second objects;
Relative inclination of the first and second objects detected in the detection step by changing the other inclination with reference to one of the first and second objects by the inclination adjusting means And a tilt adjustment step of adjusting the tilt angle to a predetermined tilt.

前記特許文献1の基板の平坦化加工方法は、直径が6インチ硬脆性基板の6mm反り高さを0.1mm以下の反り高さまで減らす効果を有するが、結晶配向の傾斜角度誤差がプラスマイナス0.10度あり、例えば、基板をLED基板として利用した場合、エネルギィ変換率が30%と低い基板となってしまい、LED素子の輝度の向上が業界より望まれている。   The planarizing method of the substrate disclosed in Patent Document 1 has the effect of reducing the 6 mm warp height of a 6 inch diameter hard and brittle substrate to a warp height of 0.1 mm or less, but the tilt angle error of crystal orientation is plus or minus 0 For example, when the substrate is used as an LED substrate, the substrate has a low energy conversion rate of 30%, and improvement in the luminance of the LED element is desired by the industry.

前記特許文献2は、ゴニオステージ上の基板の角度調整方法を開示するが、このゴニオステージ上に基板を吸着固定するチャック手段を開示するものではない。また、方位差角(θ)が0.05度より大きいので、エネルギィ変換率は約35〜40%と特許文献1より向上するが、LED素子の輝度の向上が業界より望まれている。また、SiC基板が抵抗器センサーに用いられたときは、より抵抗値を小さくすることが望まれている。   Although the patent document 2 discloses a method of adjusting the angle of the substrate on the gonio stage, it does not disclose a chuck means for attracting and fixing the substrate on the gonio stage. Moreover, since the misorientation angle (θ) is larger than 0.05 degrees, the energy conversion rate is improved to about 35 to 40% as compared to Patent Document 1, but improvement in the luminance of the LED element is desired by the industry. In addition, when the SiC substrate is used for a resistor sensor, it is desired to further reduce the resistance value.

前記特許文献3は、XYθ−ステージ上の基板の角度調整方法を開示するが、このXYθ−ステージ上に基板を吸着固定するチャック手段を開示するものではない。   Although Patent Document 3 discloses a method of adjusting the angle of the substrate on the XYθ-stage, it does not disclose a chuck means for attracting and fixing the substrate on the XYθ-stage.

特開2014−192307号公報JP, 2014-192307, A 特開2014−058444号公報JP, 2014-058444, A 特許第5417655号明細書Patent No. 5417655 specification

本願発明は、特許文献2、特許文献3に開示されるゴニオステージ、スイベル機構、または、XYθ−ステージ(以下、3者を纏めて「ゴニオステージ」として表す。)をポーラスセラミック製吸着チャックに取り組んだワークステージに設計変更することにより、研削加工された硬脆性基板の反り高さを0.5mm以下、方位差角(θ)がプラスマイナス(±)0.05度以下の加工基板を得ることができる研削方法を提供するものである。 The present invention relates to an adsorption chuck made of a porous ceramic, a gonio stage, a swivel mechanism or an XYθ-stage (hereinafter referred to as “the gonio stage” together) disclosed in Patent Document 2 and Patent Document 3). By changing the design to the work stage that we worked on, we obtain a processed substrate with a warp height of 0.5 mm or less and a misorientation angle (θ) of plus or minus (±) 0.05 degrees or less by grinding the hard and brittle substrate Provides a grinding method that can

発明は、下記の工程を経由して硬脆性基板の表面平坦化加工をすることを特徴とする、硬脆性基板の平坦化加工方法を提供するものである。
(1).研削装置のゴニオステージの上に設けられた吸着チャックの上に通気性発泡樹脂シートを積層しその通気性発泡樹脂シートの上面に前記硬脆性基板を装着した後、結晶方位(結晶軸)を計測する機器により前記硬脆性基板の結晶方位を測定する工程、
(2).測定された結晶方位から前記硬脆性基板のターゲット角度を求め、そのターゲット角度の前記硬脆性基板と前記吸着チャックの水平面間の角度ずれ(θ)を求め、前記吸着チャック下部に装着した前記ゴニオステージでX方向およびY方向を組み合わせて前記角度ずれ(θ)分だけ前記吸着チャックの水平面を傾斜調整する角度調整工程、
(3).角度調整された前記吸着チャック上の前記硬脆性基板の表面をカップホイール型のビトリファイドボンド研削砥石#300〜#600砥番の第1の研削砥石により研削加工して前記硬脆性基板の片側の基準面を得る標準化研削工程、
(4).片側基準面が得られた前記硬脆性基板を表裏逆にして前記吸着チャック面上に吸着させる硬脆性基板の反転固定工程、
(5).前記ゴニオステージにより前記吸着チャックの傾きを0度に戻し、前記吸着チャックの上面を水平方向に平行とする前記吸着チャックの傾斜角度減調整工程、
(6).前記吸着チャック上の前記硬脆性基板の表面を前記第1の研削砥石により研削加工して前記硬脆性基板の表面を平坦化研削加工する工程、
(7).前記研削装置の砥石ヘッドの前記第1の研削砥石をカップホイール型のビトリファイドボンド研削砥石#1,000〜#2,000砥番の第2の研削砥石に変え、前記吸着チャックの上に平坦化研削加工された前記硬脆性基板を装着した後、結晶方位(結晶軸)を計測する機器により前記硬脆性基板の結晶方位を測定する工程、
(8).測定された結晶方位から前記硬脆性基板のターゲット角度を求め、そのターゲット角度の前記硬脆性基板と前記吸着チャックの水平面間の角度ずれ(θ)を求め、前記吸着チャック下部に装着した前記ゴニオステージでX方向およびY方向を組み合わせて前記角度ずれ(θ)分だけ前記吸着チャックの水平面を傾斜調整する角度調整工程、
(9).角度調整された前記吸着チャック上の前記硬脆性基板の表面を前記第2の研削砥石により研削加工して前記硬脆性基板の片側の基準面を得る標準化研削工程、
(10).片側基準面が得られた前記硬脆性基板を表裏逆にして前記吸着チャック面上に吸着させる前記硬脆性基板の反転固定工程、
(11).前記ゴニオステージにより前記吸着チャックの傾きを0度に戻し、前記吸着チャックの上面を水平方向に平行とする前記吸着チャックの傾斜角度減調整工程、
(12).前記吸着チャック上の前記硬脆性基板の表面を前記第2の研削砥石により研削加工して前記硬脆性基板の表面を平坦化研削加工する工程。
The present invention provides a method for planarizing a hard / brittle substrate, characterized in that the surface of the hard / brittle substrate is processed through the following steps.
(1). After laminating the breathable foamed resin sheet on the suction chuck provided on the goniometer stage of the grinding machine and mounting the hard and brittle substrate on the upper surface of the breathable foamed resin sheet, the crystal orientation (crystal axis) is measured Measuring the crystal orientation of the hard and brittle substrate by using
(2). Obtains the measured target angle of the hard brittle substrate from the crystal orientation, the angle deviation between the horizontal plane of the vacuum chuck and the hard brittle substrate of the target angle of the (theta) determined, the goniometer mounted on the suction chuck lower An angle adjustment step of adjusting the inclination of the horizontal plane of the suction chuck by the angle deviation (θ) by combining the X direction and the Y direction on the stage;
(3). A reference of one side of the hard and brittle substrate by grinding the surface of the hard and brittle substrate on the suction chuck whose angle is adjusted by a first grinding wheel of a cup wheel type vitrified bond grinding wheel # 300 to # 600 abrasive number Standardized grinding process to get the surface,
(4). A reverse fixing step of the hard and brittle substrate in which the hard and brittle substrate from which the one side reference surface is obtained is turned upside down and adsorbed on the suction chuck surface;
(5). The inclination angle reduction adjustment step of the adsorption chuck, wherein the inclination of the adsorption chuck is returned to 0 degree by the gonio stage, and the upper surface of the adsorption chuck is parallel to the horizontal direction;
(6). Grinding the surface of the hard and brittle substrate on the suction chuck with the first grinding wheel to planarize and grind the surface of the hard and brittle substrate;
(7). The first grinding wheel of the grinding wheel head of the grinding apparatus is changed to a second grinding wheel of a cup wheel type vitrified bond grinding wheel # 1,000 to # 2,000 abrasive number, and is flattened on the suction chuck A step of measuring the crystal orientation of the hard and brittle substrate with a device for measuring a crystal orientation (crystal axis) after mounting the ground and processed hard and brittle substrate;
(8). Obtains the measured target angle of the hard brittle substrate from the crystal orientation, the angle deviation between the horizontal plane of the vacuum chuck and the hard brittle substrate of the target angle of the (theta) determined, the goniometer mounted on the suction chuck lower An angle adjustment step of adjusting the inclination of the horizontal plane of the suction chuck by the angle deviation (θ) by combining the X direction and the Y direction on the stage;
(9). A standardized grinding process for obtaining a reference surface on one side of the hard and brittle substrate by grinding the surface of the hard and brittle substrate on the suction chuck whose angle is adjusted by the second grinding wheel;
(10). A reverse fixing step of the hard and brittle substrate in which the hard and brittle substrate from which one side reference surface is obtained is turned upside down and adsorbed on the suction chuck surface;
(11). The inclination angle reduction adjustment step of the adsorption chuck, wherein the inclination of the adsorption chuck is returned to 0 degree by the gonio stage, and the upper surface of the adsorption chuck is parallel to the horizontal direction;
(12). Step of grinding the surface of the hard and brittle substrate on the suction chuck with the second grinding wheel to planarize and grind the surface of the hard and brittle substrate.

最初の基板の研削加工により、結晶方位ずれ±0.05度以下の基準面を得、次の反転基板面の研削加工により、結晶方位ずれ±0.01度以下の平坦化加工された硬脆性基板を実現させることが可能となった。なお、通気性発泡樹脂シートの利用は、最初の基準面を得る標準化研削工程時は、吸着チャック上に載置して反り緩衝材として利用し、一旦、基準面が出された後の反転基板面の研削加工時は、載置したままでも、取り除いて利用しなくても良い。   Grinding processing of the first substrate obtains a reference plane with a crystal orientation deviation of ± 0.05 degrees or less, and grinding processing of the next reverse substrate surface results in flattening of a crystal orientation deviation of ± 0.01 degrees or less. It became possible to realize the substrate. In addition, the utilization of the air-permeable foamed resin sheet is placed on the suction chuck and used as a warp cushioning material at the time of the standardized grinding process for obtaining the first reference surface, and the reverse substrate after the reference surface is once taken out At the time of grinding of the surface, it may not be removed and used even when it is placed.

基板の研削加工工程のフロー図である。It is a flowchart of the grinding process of a board | substrate.

図1に示す本発明の研削装置1は、カップホイール型研削砥石10gを回転軸10rに軸承する研削ヘッド10と、基板固定用のポーラスセラミック製吸着チャック20cと、前記ポーラスセラミック製吸着チャック20cの下部にこの吸着チャック20cの傾きを調整できるゴニオステージ20Gと、前記ポーラスセラミック製吸着チャック20cの回転軸20rで構成された回転テーブル機構20を有し、この回転テーブル機構20のポーラスセラミック製吸着チャック20c上面に対向する上方向に前記研削ヘッド10の回転軸10rの回転機構と上下送り機構が設けられ、前記吸着チャック20cの上には結晶方位の計測機構30が設けられている。また、研削ヘッド10のカップホイール型の研削砥石10gのフランジ(口金)の内面には、カップホイール型研削砥石10gの砥石刃10gcと前記ポーラスセラミック製吸着チャック20c表面が接触する加工点に研削液が供給されるように液体通路(図示されていない)が設けられている。 Grinding apparatus of the present invention shown in FIG. 1 1 is a grinding head 10 that journalled cup wheel type grinding wheel 10g to the rotation shaft 10r, the vacuum chuck 20c of the porous ceramic substrate fixed, the porous ceramic adsorption a goniometer 20G capable of adjusting the inclination of the suction chuck 20c in the lower portion of the chuck 20c, the has a porous ceramic vacuum chuck 20c rotary table mechanism 20 composed of a rotation shaft 20r, the porous of the rotary table mechanism 20 A rotating mechanism and an up-and-down feed mechanism of the rotating shaft 10r of the grinding head 10 are provided upward facing the upper surface of the suction chuck 20c made of ceramic, and a measuring mechanism 30 of crystal orientation is provided on the suction chuck 20c. There is. Further, on the inner surface of the cup wheel type grindstone 10g of the flange of the grinding head 10 (die), the processing point where the cup wheel type grinding wheel 10g of the grinding blade 10gc porous ceramic vacuum chuck 20c surface is in contact A fluid passage (not shown) is provided to supply the grinding fluid.

上記ゴニオステージ20Gとしては、前記特許文献2の図4Eに示されるスイベル機構を用いてもよいし、特許文献3の図2および図3に示されるステージの傾きを3点でX−Yテーブル機構を傾斜させる3本のローラーを付した傾斜機構を用いてもよい。   As the gonio stage 20G, a swivel mechanism shown in FIG. 4E of the patent document 2 may be used, or an XY table mechanism with the inclination of the stage shown in FIGS. 2 and 3 of the patent document 3 at three points. You may use the inclination mechanism which attached three rollers which inclines.

カップホイール型の研削砥石10gは、粗研削加工と仕上げ研削加工ができるように、カップホイール型粗研削砥石とカップホイール型仕上げ研削砥石の2種を用意しておくのがより平坦化加工された硬脆性基板を得ることができる。カップホイール型粗研削砥石としては、ビトリファイドボンド研削砥石(#300〜#600砥番)を用い、研削砥石10gの回転軸10rの回転速度は1,200〜2,000min−1が好ましい。また、カップホイール型仕上げ研削砥石は、ビトリファイドボンド研削砥石(#1,000〜2,000砥番)が好ましく、研削砥石10の回転軸10rの回転速度は900〜2,000min−1が好ましい。 In order to be able to perform rough grinding and finish grinding, the cup wheel type grinding wheel 10g is more flattened by preparing two types of cup wheel type rough grinding wheel and cup wheel type finishing grinding wheel Hard and brittle substrates can be obtained. As the cup wheel type rough grinding wheel, a vitrified bond grinding wheel (# 300 to # 600 abrasive number) is used, and the rotational speed of the rotating shaft 10r of the grinding wheel 10g is preferably 1,200 to 2,000 min- 1 . The cup wheel type finish grinding wheel is preferably a vitrified bond grinding wheel (# 1,000 to 2,000 abrasive numbers), and the rotational speed of the rotating shaft 10r of 10 g of the grinding wheel is preferably 900 to 2,000 min- 1 .

研削液としては、純水でもよいが、セリア粒子、コロイダルシリカ粒子、ジルコニア粒子等の微小遊離砥粒を含む水分散液を用いるのが研削加工時間を短縮できる利点がある。   The grinding fluid may be pure water, but using an aqueous dispersion containing fine loose abrasive grains such as ceria particles, colloidal silica particles, and zirconia particles is advantageous in that the grinding time can be shortened.

結晶方位の計測機構30としては、X線利用のリガク株式会社製“FSASIII”(商品名)を実施例では用いた。   As a measurement mechanism 30 of crystal orientation, "FSAS III" (trade name) manufactured by Rigaku Corporation using X-rays was used in the examples.

上記研削装置1を用いて硬脆性基板の表面平坦化加工をするには、次の(1)から(6)の工程を経由する。
(1).研削装置1のゴニオステージ20Gをポーラスセラミック製吸着チャック20cに取り組んだ回転テーブル機構20の吸着チャック20c上に硬脆性基板wを吸引固定した後、ゴニオステージに取り付けた結晶方位の計測機構30により前記硬脆性基板wの結晶方位を測定する工程、
(2).ターゲット角度C(指定方からの硬脆性基板wとポーラスセラミック製吸着チャック20c水平面間の角度ずれ(θ)分を前記ポーラスセラミック製吸着チャック20c下部に装着した前記ゴニオステージ20Gで方向および方向を組み合わせて前記角度ずれ(θ)分だけ前記ポーラスセラミック製吸着チャック20c水平面を傾斜調整する角度調整工程、
(3).角度調整されたポーラスセラミック製吸着チャック20c上の硬脆性基板wの表面を研削砥石10gにより研削加工して硬脆性基板wの片側の基準面を得る標準化研削工程、
(4).片側基準面が得られた硬脆性基板wを表裏逆にして前記ポーラスセラミック製吸着チャック20c面上に吸着させる硬脆性基板の反転固定工程、
(5).前記ゴニオステージ20Gにより前記ポーラスセラミック製吸着チャック20cの傾きを0度に戻し、ポーラスセラミック製吸着チャック20cの上面を水平方向に平行とする前記ポーラスセラミック製吸着チャック20cの傾斜角度減調整工程、
および、
(6).前記ポーラスセラミック製吸着チャック20c上の前記硬脆性基板wの表面を研削砥石10gにより研削加工して硬脆性基板の表面を平坦化研削加工する工程。
In order to planarize the surface of the hard and brittle substrate using the grinding apparatus 1, the following steps (1) to (6) are performed.
(1). Hardly brittle substrate w is suction fixed on suction chuck 20c of rotary table mechanism 20 in which gonio stage 20G of grinding apparatus 1 is engaged with suction chuck 20c made of porous ceramic, and then crystal orientation measuring mechanism 30 attached to gonio stage Measuring a crystal orientation of the hard and brittle substrate w;
(2). The target angle C the goniometer 20G wearing the angle deviation (theta) content between hard brittle substrate w and porous ceramic vacuum chuck 20c horizontal plane from (finger Sadakata position) to the suction chuck 20c bottom made of the porous ceramic An angle adjustment step of adjusting the inclination of the horizontal surface of the porous ceramic adsorption chuck 20c by the angular deviation (θ) by combining the X direction and the Y direction;
(3). Standardization grinding process to obtain the one side of the reference plane of the hard brittle substrate w the angle adjustment surface of the hard brittle substrate w on the porous ceramic vacuum chuck 20c and grinding by the grinding wheel 10 g,
(4). Inverting fixing step of hard brittle substrate to be adsorbed to the porous ceramic vacuum chuck 20c plane a hard and brittle substrate w on one side reference surface is obtained in the front and back reversed,
(5). The return of the tilt of the by goniometers 20G porous ceramic suction chuck 20c to 0 °, the inclination angle decrease adjustment of the porous ceramic suction chuck 20c to parallel the upper surface of the porous ceramic suction chuck 20c in the horizontal direction Process,
and,
(6). Planarizing grinding the surface of the hard brittle substrate by grinding the surface by grinding wheel 10g of the hard brittle substrate w on the porous ceramic vacuum chuck 20c.

なお、上記(3)工程および(6)工程の研削工程は、カップホイール型研削砥石を変えて粗研削工程と仕上げ研削工程を行う2回の研削工程とするのが、研削加工時間を短縮でき、かつ、結晶方位ずれのより小さい硬脆性基板を得るのに好ましい。 The above (3) process and (6) Step of grinding steps, to the two grinding step of changing the grinding wheel of the cup wheel type performs rough grinding step and a finish grinding step, reducing the grinding time It is preferable and possible to obtain a hard and brittle substrate with smaller crystallographic misorientation.

実施例1
硬脆性基板として直径6インチ、厚み3,000μm、反り高さ0.5mmのサファイア基板を用い、次の工程を経由して平坦化加工された基板を製造した。
Example 1
Using a sapphire substrate having a diameter of 6 inches, a thickness of 3,000 μm, and a warp height of 0.5 mm as a hard and brittle substrate, a planarized substrate was manufactured through the following steps.

(1).研削装置1のポーラスセラミック製吸着チャック20c上に厚み600μmの通気性直鎖低密度ポリエチレンフォームシート(通気性発泡樹脂シート20kを接着し、次いで、この通気性直鎖低密度ポリエチレンフォームシート上に硬脆性基板wを載置した後に吸引固定した。次いで、ゴニオステージ20Gに取り付けた結晶方位の計測機構30により前記硬脆性基板wの結晶方位を測定し角度ずれ(θ)が0.8度と測定した。 (1). Bonding the thickness 600μm breathable linear low density polyethylene foam sheet (breathable foamed resin sheet 20k) to the grinding apparatus 1 of the porous ceramic on the adsorption chuck 20c, then this passing temper linear low density polyethylene foam sheet After mounting the hard and brittle substrate w on top, it was fixed by suction. Then, the angular deviation measured crystal orientation position of the hard brittle substrate w by measuring mechanism 30 of a crystal orientation attached to goniostage 20G (theta) is measured with 0.8 degrees.

(2).ターゲット角度Cからの硬脆性基板wとポーラスセラミック製吸着チャック20c水平面間の上記角度ずれ(θ)分0.8度前記ポーラスセラミック製吸着チャック20c下部に装着した前記ゴニオステージ20Gで方向および方向を組み合わせて前記角度ずれ(θ)分0.8度だけ前記ポーラスセラミック製吸着チャック20c水平面を傾斜調整する角度調整を行った。 (2). Hard brittle substrate w and the angle deviation (theta) min 0.8 ° wherein the goniometer 20G in the X direction mounted on the vacuum chuck 20c bottom of the porous ceramic between the porous ceramic vacuum chuck 20c horizontal plane from the target angle C By combining the Y direction and the Y direction, the angle adjustment was performed to adjust the inclination of the horizontal surface of the suction chuck 20c made of porous ceramic by 0.8 degrees by the angle deviation (θ).

(3).角度調整されたポーラスセラミック製吸着チャック20c上の硬脆性基板wの表面を研削砥石10gとなるビトリファイドボンド粗研削砥石(#325砥番)にて、研削砥石10gの回転軸10rの回転速度を1,200min−1、ポーラスセラミック製吸着チャック20cの回転軸20rの回転速度を200min−1の加工条件で研削加工して硬脆性基板wの片側の基準面を得る標準化研削工程を行った。 (3). Similar angle adjusted to the surface of the hard brittle substrate w on the porous ceramic vacuum chuck 20c becomes grindstone 10g vitrified bonded rough grinding (# 325 abrasive numbers), the rotational speed of the rotating shaft 10r of the grinding wheel 10g 1,200min -1, were standardized grinding process to obtain the one side of the reference surface of the grinding to hard brittle substrate w at processing conditions of the rotation speed 200 min -1 of the rotating shaft 20r of the porous ceramic vacuum chuck 20c.

(4).片側基準面が得られた上記硬脆性基板wを表裏逆にして前記ポーラスセラミック製吸着チャック20c面上に載置、ついで、吸着させる硬脆性基板の反転固定工程を行った。 (4). The hard brittle substrate w on one side reference surface is obtained by upside down and placed on the porous ceramic vacuum chuck 20c plane, then it was inverted fixing step of hard brittle substrate is adsorbed.

(5).前記ゴニオステージ20Gにより前記ポーラスセラミック製吸着チャック20cの傾きを0度に戻し、ポーラスセラミック製吸着チャック20cの上面を水平方向に平行とする前記ポーラスセラミック製吸着チャック20cの傾斜角度減調整工程を行った。 (5). The return of the tilt of the by goniometers 20G porous ceramic suction chuck 20c to 0 °, the inclination angle decrease adjustment of the porous ceramic suction chuck 20c to parallel the upper surface of the porous ceramic suction chuck 20c in the horizontal direction The process was done.

(6).前記ポーラスセラミック製吸着チャック20c上の前記硬脆性基板wの表面をビトリファイドボンド粗研削砥石(#325砥番)にて、研削砥石10gの回転軸10rの回転速度を1,200min−1、ポーラスセラミック製吸着チャックの回転軸20rの回転速度を200min−1の加工条件で研削加工して硬脆性基板wの反対側面を平坦化研削加工する工程を行った。 (6). Said second porous ceramic of the hard brittle substrate w surface vitrified bonded rough grinding wheel on the adsorption chuck 20c (# 325 abrasive numbering), 1,200min -1 rotational speed of the rotating shaft 10r of the grinding wheel 10 g, porous the other side of the grinding to hard brittle substrate w was planarizing grinding in processing conditions of the rotational speed of the rotating shaft 20r of ceramic vacuum chuck 200 min -1.

(7).研削装置1の研削砥石10gをカップホイール型ビトリファイドボンド仕上げ研削砥石(#2,000砥番)に変更し、前記ポーラスセラミック製吸着チャック20c上に硬脆性基板wを載置した後に吸引固定した。次いで、ゴニオステージ20Gに取り付けた結晶方位の計測機構30により前記硬弱性基板wの結晶方位を測定し角度ずれ(θ)が0.05度と測定した。 (7). Change the Grinding Wheels 10g of the grinding device 1 in a cup-wheel vitrified bonded finish grinding wheel (# 2000 abrasive numbering), suction securing after placing the hard brittle substrate w on the porous ceramic vacuum chuck 20c did. Next, the crystal orientation of the hard substrate w was measured by the crystal orientation measuring mechanism 30 attached to the gonio stage 20G, and the angular deviation (θ) was measured at 0.05 degrees.

(8).ターゲット角度Cからの硬脆性基板wとポーラスセラミック製吸着チャック20c水平面間の上記角度ずれ(θ)0.05度分を前記ポーラスセラミック製吸着チャック20c下部に装着した前記ゴニオステージ20Gで方向および方向を組み合わせて前記角度ずれ(θ)0.05度分だけ前記ポーラスセラミック製吸着チャック20c水平面を傾斜調整する角度調整を行った。 (8). The angular deviation (θ) of 0.05 degrees between the horizontal axis of the hard and brittle substrate w and the suction chuck 20c made of porous ceramic from the target angle C is carried out by the gonio stage 20G mounted under the suction chuck 20c made of porous ceramic The X direction and the Y direction were combined to perform angle adjustment for adjusting the inclination of the horizontal surface of the suction chuck 20c made of porous ceramic by 0.05 degree of the angle deviation (θ).

(9).角度調整されたポーラスセラミック製吸着チャック20c面上の硬脆性基板wの表面をカップホイール型ビトリファイドボンド仕上げ研削砥石(#2,000砥番)にて、研削砥石10gの回転軸10rの回転速度を400min−1、ポーラスセラミック製吸着チャック20cの回転軸20rの回転速度を200min−1の加工条件で研削加工して硬脆性基板wの片側の基準面を得る標準化研削工程を行った。 (9). Similar angle adjusted porous ceramic vacuum chuck 20c cup wheel type the surface of the hard brittle substrate w on surface vitrified bonded finish grinding wheel (# 2000 abrasive numbers), the rotational speed of the rotating shaft 10r of the grinding wheel 10g the 400 min -1, was standardized grinding process to obtain the one side of the reference surface of the grinding to hard brittle substrate w at processing conditions of the rotation speed 200 min -1 of the rotating shaft 20r of the porous ceramic vacuum chuck 20c.

(10).再度の片側基準面が得られた上記硬脆性基板wを表裏逆にして前記ポーラスセラミック製吸着チャック20c上に載置、ついで、吸着させる硬脆性基板の反転固定工程を行った。 (10). And the hard brittle substrate w on one side reference surface is obtained again upside down and placed on the porous ceramic suction chuck 20c, and then was subjected to reversal fixing step of hard brittle substrate w is adsorbed.

(11).前記ゴニオステージ20Gにより前記ポーラスセラミック製吸着チャック20cの傾きを0度に戻し、ポーラスセラミック製吸着チャック20cの上面を水平方向に平行とする前記ポーラスセラミック製吸着チャック20cの傾斜角度減調整工程を行った。 (11). The return of the tilt of the by goniometers 20G porous ceramic suction chuck 20c to 0 °, the inclination angle decrease adjustment of the porous ceramic suction chuck 20c to parallel the upper surface of the porous ceramic suction chuck 20c in the horizontal direction The process was done.

(12).前記ポーラスセラミック製吸着チャック20c上の前記硬脆性基板wの表面を前記カップホイール型ビトリファイドボンド仕上げ研削砥石(#2,000砥番)にて、研削砥石10gの回転軸10rの回転速度を400min−1、ポーラスセラミック製吸着チャックの回転軸20rの回転速度を200min−1の加工条件で研削加工して硬脆性基板wの反対側面を平坦化研削加工する工程を行った。 (12). The boiled the surface of the hard brittle substrate w on the porous ceramic vacuum chuck 20c cup wheel type vitrified bonded finish grinding wheel (# 2000 abrasive numbering), 400 min rotation speed of the rotating shaft 10r of the grinding wheel 10g -1, it was planarizing grinding the opposite side of the grinding to hard brittle substrate w at processing conditions of the rotational speed of the rotating shaft 20r of the porous ceramic vacuum chuck 200 min -1.

得られたサファイア基板の厚みは、1,300μm、結晶方位ずれは、0.008であり、基板の反り高さは、0.05mmであった。 The thickness of the obtained sapphire substrate was 1,300 μm, the crystal orientation deviation was 0.008 ° , and the warpage height of the substrate was 0.05 mm.

実施例2
硬脆性基板wとして直径2インチ、厚み1,000μm、反り高さ0.3mmの窒化ガリウム基板を用いる外は、実施例1と同様にして基板の平坦化研削加工を行った。
Example 2
The flattening grinding process of the substrate was performed in the same manner as in Example 1 except that a gallium nitride substrate having a diameter of 2 inches, a thickness of 1,000 μm, and a warp height of 0.3 mm was used as the hard and brittle substrate w.

得られた窒化ガリウム基板の厚みは、400μm、結晶方位ずれは、0.010であり、基板の反り高さは、0.01mmであった。 The thickness of the obtained gallium nitride substrate was 400 μm, the crystal orientation deviation was 0.010 ° , and the warpage height of the substrate was 0.01 mm.

本発明の硬脆性基板の平坦化加工方法は、基板の結晶配向の傾斜角度誤差がプラスマイナス0.010度以下の硬脆性基板を提供できる。   The flattening processing method of a hard and brittle substrate of the present invention can provide a hard and brittle substrate having a tilt angle error of crystal orientation of the substrate of plus or minus 0.010 degrees or less.

1 研削装置
w 硬脆性基板
10 研削ヘッ
10r 回転軸(砥石軸)
10g 削砥石
10g 石刃
20 回転テーブル機構
20G ゴニオステージ
20k 通気性発泡樹脂シート
30 測機
ターゲット角度
1 grinder w hard brittle substrate 10 grinding heads 10r rotary shaft (wheel spindle)
10g Grinding Wheels 10g c abrasive stone cutter 20 rotation table mechanism 20G goniometer 20k breathable foamed resin sheet 30 meter measuring Organization C target angle

Claims (1)

下記の工程を経由して硬脆性基板の表面平坦化加工をすることを特徴とする、硬脆性基板の平坦化加工方法。
(1).研削装置のゴニオステージの上に設けられた吸着チャックの上に通気性発泡樹脂シートを積層しその通気性発泡樹脂シートの上面に前記硬脆性基板を装着した後、結晶方位を計測する機器により前記硬脆性基板の結晶方位を測定する工程、
(2).測定された結晶方位から前記硬脆性基板のターゲット角度を求め、そのターゲット角度の前記硬脆性基板と前記吸着チャックの水平面間の角度ずれを求め、前記吸着チャック下部に装着した前記ゴニオステージでX方向およびY方向を組み合わせて前記角度ずれ分だけ前記吸着チャックの水平面を傾斜調整する角度調整工程、
(3).角度調整された前記吸着チャック上の前記硬脆性基板の表面をカップホイール型のビトリファイドボンド研削砥石#300〜#600砥番の第1の研削砥石により研削加工して前記硬脆性基板の片側の基準面を得る標準化研削工程、
(4).片側基準面が得られた前記硬脆性基板を表裏逆にして前記吸着チャック面上に吸着させる前記硬脆性基板の反転固定工程、
(5).前記ゴニオステージにより前記吸着チャックの傾きを0度に戻し、前記吸着チャックの上面を水平方向に平行とする前記吸着チャックの傾斜角度減調整工程、
(6).前記吸着チャック上の前記硬脆性基板の表面を前記第1の研削砥石により研削加工して前記硬脆性基板の表面を平坦化研削加工する工程、
(7).前記研削装置の砥石ヘッドの前記第1の研削砥石をカップホイール型のビトリファイドボンド研削砥石#1,000〜#2,000砥番の第2の研削砥石に変え、前記吸着チャックの上に平坦化研削加工された前記硬脆性基板を装着した後、結晶方位を計測する機器により前記硬脆性基板の結晶方位を測定する工程、
(8).測定された結晶方位から前記硬脆性基板のターゲット角度を求め、そのターゲット角度の前記硬脆性基板と前記吸着チャックの水平面間の角度ずれを求め、前記吸着チャック下部に装着した前記ゴニオステージでX方向およびY方向を組み合わせて前記角度ずれ分だけ前記吸着チャックの水平面を傾斜調整する角度調整工程、
(9).角度調整された前記吸着チャック上の前記硬脆性基板の表面を前記第2の研削砥石により研削加工して前記硬脆性基板の片側の基準面を得る標準化研削工程、
(10).片側基準面が得られた前記硬脆性基板を表裏逆にして前記吸着チャック面上に吸着させる前記硬脆性基板の反転固定工程、
(11).前記ゴニオステージにより前記吸着チャックの傾きを0度に戻し、前記吸着チャックの上面を水平方向に平行とする前記吸着チャックの傾斜角度減調整工程、
(12).前記吸着チャック上の前記硬脆性基板の表面を前記第2の研削砥石により研削加工して前記硬脆性基板の表面を平坦化研削加工する工程。
1. A method of planarizing a hard and brittle substrate, the method comprising planarizing the surface of the hard and brittle substrate through the following steps.
(1). A breathable foamed resin sheet is laminated on an adsorption chuck provided on a goniometer stage of a grinding apparatus, and the hard and brittle substrate is mounted on the upper surface of the breathable foamed resin sheet, and then the above-mentioned equipment is used. Measuring the crystal orientation of the hard and brittle substrate,
(2). Obtains the measured target angle of the hard brittle substrate from the crystal orientation, X at the target angle of the the hard brittle substrate determined angular deviation between the horizontal plane of the suction chuck, the goniometer mounted on the suction chuck lower An angle adjustment step of adjusting the inclination of the horizontal plane of the suction chuck by the angle deviation by combining the direction and the Y direction;
(3). A reference of one side of the hard and brittle substrate by grinding the surface of the hard and brittle substrate on the suction chuck whose angle is adjusted by a first grinding wheel of a cup wheel type vitrified bond grinding wheel # 300 to # 600 abrasive number Standardized grinding process to get the surface,
(4). A reverse fixing step of the hard and brittle substrate in which the hard and brittle substrate from which one side reference surface is obtained is turned upside down and adsorbed on the suction chuck surface;
(5). The inclination angle reduction adjustment step of the adsorption chuck, wherein the inclination of the adsorption chuck is returned to 0 degree by the gonio stage, and the upper surface of the adsorption chuck is parallel to the horizontal direction;
(6). Grinding the surface of the hard and brittle substrate on the suction chuck with the first grinding wheel to planarize and grind the surface of the hard and brittle substrate;
(7). The first grinding wheel of the grinding wheel head of the grinding apparatus is changed to a second grinding wheel of a cup wheel type vitrified bond grinding wheel # 1,000 to # 2,000 abrasive number, and is flattened on the suction chuck A step of measuring the crystal orientation of the hard and brittle substrate with a device for measuring the crystal orientation after mounting the ground and processed hard and brittle substrate;
(8). Obtains the measured target angle of the hard brittle substrate from the crystal orientation, X at the target angle of the the hard brittle substrate determined angular deviation between the horizontal plane of the suction chuck, the goniometer mounted on the suction chuck lower An angle adjustment step of adjusting the inclination of the horizontal plane of the suction chuck by the angle deviation by combining the direction and the Y direction;
(9). A standardized grinding process for obtaining a reference surface on one side of the hard and brittle substrate by grinding the surface of the hard and brittle substrate on the suction chuck whose angle is adjusted by the second grinding wheel;
(10). A reverse fixing step of the hard and brittle substrate in which the hard and brittle substrate from which one side reference surface is obtained is turned upside down and adsorbed on the suction chuck surface;
(11). The inclination angle reduction adjustment step of the adsorption chuck, wherein the inclination of the adsorption chuck is returned to 0 degree by the gonio stage, and the upper surface of the adsorption chuck is parallel to the horizontal direction;
(12). Step of grinding the surface of the hard and brittle substrate on the suction chuck with the second grinding wheel to planarize and grind the surface of the hard and brittle substrate.
JP2015044338A 2015-03-06 2015-03-06 Method of flattening hard and brittle substrate Active JP6538375B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015044338A JP6538375B2 (en) 2015-03-06 2015-03-06 Method of flattening hard and brittle substrate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015044338A JP6538375B2 (en) 2015-03-06 2015-03-06 Method of flattening hard and brittle substrate

Publications (3)

Publication Number Publication Date
JP2016163914A JP2016163914A (en) 2016-09-08
JP2016163914A5 JP2016163914A5 (en) 2018-05-10
JP6538375B2 true JP6538375B2 (en) 2019-07-03

Family

ID=56876406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015044338A Active JP6538375B2 (en) 2015-03-06 2015-03-06 Method of flattening hard and brittle substrate

Country Status (1)

Country Link
JP (1) JP6538375B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106239742B (en) * 2016-09-29 2019-01-04 漳州市天趣数控设备有限公司 A kind of ceramics vehicle carving machine
CN112743370A (en) * 2020-12-29 2021-05-04 杭州峰峦贸易有限公司 Auxiliary machining device for thin-wall short pipe and using method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1015795A (en) * 1996-07-08 1998-01-20 Koyo Mach Ind Co Ltd Supporting device and grinding device for correcting orientation of single crystal material
JP3348429B2 (en) * 1996-12-26 2002-11-20 信越半導体株式会社 Thin work surface grinding method
JP2008114326A (en) * 2006-11-02 2008-05-22 Sharp Corp Grinding device
RU2440885C2 (en) * 2007-06-25 2012-01-27 Сэнт-Гобэн Керамикс Энд Пластикс, Инк. Method of varying monocrystalline body crystallographic orientation (versions) and device to this end

Also Published As

Publication number Publication date
JP2016163914A (en) 2016-09-08

Similar Documents

Publication Publication Date Title
EP2176028B1 (en) Methods of crystallographically reorienting single crystal bodies
JP5513647B2 (en) Sapphire substrate and manufacturing method thereof
JP2009246240A (en) Grinding method for grinding back-surface of semiconductor wafer and grinding apparatus for grinding back-surface of semiconductor wafer used in same
JP2010514581A (en) Sapphire substrate and manufacturing method thereof
CN111630213B (en) Seed crystal for growing single crystal 4H-SiC and processing method thereof
WO2012164757A1 (en) Device for machining columnar member
JP2023059932A (en) Truing method and chamfer device
JP6538375B2 (en) Method of flattening hard and brittle substrate
JP6457275B2 (en) Grinding equipment
JP6271339B2 (en) Grinding and polishing equipment
JP2016163914A5 (en)
JP2012121096A (en) Grinding device
JP2009095952A (en) Manufacturing method of wafer
TWI804670B (en) Method and apparatus for manufacturing semiconductor device
JP2016060031A (en) Grinding wheel
JP5387887B2 (en) Chamfering method and chamfering apparatus
JP6812068B2 (en) Processing method
WO2015172014A1 (en) High quality sapphire substrates and method of making said sapphire substrates
JP2019093518A (en) Method for processing work-piece
JP7373938B2 (en) Adjustment method
JP5150196B2 (en) Silicon wafer manufacturing method
TWI602651B (en) A Compound Chemical Mechanical Dresser
TW202239518A (en) Method of grinding workpiece
JP2024062447A (en) Semiconductor crystal wafer manufacturing apparatus and manufacturing method
TWI231246B (en) Method for polishing diamond wafer

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180305

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20180305

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20180323

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20181113

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20181120

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20190117

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190207

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20190604

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190606

R150 Certificate of patent or registration of utility model

Ref document number: 6538375

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250