JP6974979B2 - 研削装置 - Google Patents
研削装置 Download PDFInfo
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- JP6974979B2 JP6974979B2 JP2017159240A JP2017159240A JP6974979B2 JP 6974979 B2 JP6974979 B2 JP 6974979B2 JP 2017159240 A JP2017159240 A JP 2017159240A JP 2017159240 A JP2017159240 A JP 2017159240A JP 6974979 B2 JP6974979 B2 JP 6974979B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/20—Lapping pads for working plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
- B24B41/047—Grinding heads for working on plane surfaces
- B24B41/0475—Grinding heads for working on plane surfaces equipped with oscillating abrasive blocks, e.g. mounted on a rotating head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/068—Table-like supports for panels, sheets or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/12—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
- B24B55/03—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant designed as a complete equipment for feeding or clarifying coolant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/07—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving a stationary work-table
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
- B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
- B24B7/228—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding thin, brittle parts, e.g. semiconductors, wafers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
- B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
- B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
- B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
- B24B7/241—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02013—Grinding, lapping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Polarising Elements (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
- Disintegrating Or Milling (AREA)
Description
研削砥石74aの形状は、一体の環状を形成しているものでもよく、また、光触媒粒P2は、酸化スズ粒、酸化亜鉛粒、又は酸化セリウム粒等であってもよい。なお、研削砥石74aは、光触媒粒P2を含まないものであってもよく、ボンド剤としてビトリファイドボンド以外のボンド剤を用いたものであってもよい。
なお、研削砥石74aが光触媒粒P2を含まないものである場合には、発光部91は2波長の光を発光できる2波長LEDや低圧水銀ランプであると好ましく、80nm以上200nm以下の波長(例えば、波長185nm)の光と240nm以上280nm以下の波長(例えば、波長254nm)の光とを発光できるとより好ましい。もちろん、研削砥石74aが光触媒粒P2を含まないものである場合に201nm以上365nm以下の光を照射してもよい。
図1に示す外形が円形板状の被加工物Wは、例えば、難削材のSiCで形成される半導体ウエーハであり、図1において下側を向いている被加工物Wの表面Waには、分割予定ラインによって区画された格子状の領域に多数のデバイスが形成されており、表面Waを保護する保護テープTが貼着されている。被加工物Wの裏面Wbは研削ホイール74で研削される被研削面となる。なお、被加工物Wの形状及び種類は特に限定されるものではなく、研削ホイール74との関係で適宜変更可能であり、GaASまたはGaN等で形成されるウエーハや、金属で形成されたウエーハまたは金属電極が部分的にウエーハの裏面に露出したウエーハも含まれる。
なお、例えば、被加工物Wが金属で形成されたウエーハまたは金属電極が部分的にウエーハの裏面に露出したウエーハであっても、ヒドロキシラジカルの強い酸化力によって金属を酸化させて脆弱化させながら研削を行うことができるため、被加工物を円滑に研削することが可能となる。
30:保持テーブル 300:吸着部 300a:保持面 301:枠体
31:カバー 31a:蛇腹カバー
5:研削送り手段 50:ボールネジ 51:ガイドレール 52:モータ 53:昇降板 54:ホルダ
7:研削手段 70:スピンドル 70a:流路 71:ハウジング 72:モータ 73:マウント 73a:ネジ 74:研削ホイール 74a:研削砥石 74b:ホイール基台 74c:ネジ穴
8:研削水供給手段 80:研削水源 81:配管 82:調整バルブ
9:光照射手段 90:台部 91:発光部 92:洗浄水供給部 93:カバー
94:拡散防止壁 940:外側板 941:内側板 94a:入口部 94b:出口部
P1:ダイヤモンド砥粒 P2:光触媒粒 B1:ビトリファイドボンド
W:被加工物 Wa:被加工物の表面 Wb:被加工物の裏面 T:保護テープ
A:着脱領域 B:研削領域
Claims (3)
- 被加工物を保持する保持テーブルと、スピンドルと該スピンドルに装着されて該保持テーブルで保持された被加工物を研削する研削ホイールとを含む研削手段と、を備えた研削装置であって、
該研削ホイールは、砥粒をボンド剤で結合した研削砥石を有し、
該保持テーブルで保持された被加工物を該研削手段で研削する際に少なくとも該研削砥石に研削水を供給する研削水供給手段と、
該保持テーブルに隣接して配設され、該保持テーブルで保持された被加工物を研削する該研削砥石の研削面に光を照射する光照射手段と、を備え、
該光照射手段は、該光を発光する発光部と、該発光部を囲繞し該光の拡散を防止する拡散防止壁と、を有し、該研削ホイールの回転軌跡上で該研削砥石の研削面に対面して配置され、該拡散防止壁には、該研削ホイールが進入する入口部と該研削ホイールが退出する出口部とが形成されている研削装置。 - 前記研削砥石は、前記砥粒と光触媒粒とを前記ボンド剤で結合しており、
前記光照射手段は該光触媒粒を励起させる前記光を照射する、請求項1に記載の研削装置。 - 前記ボンド剤はビトリファイドボンドである、請求項1、または2に記載の研削装置。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017159240A JP6974979B2 (ja) | 2017-08-22 | 2017-08-22 | 研削装置 |
SG10201806505XA SG10201806505XA (en) | 2017-08-22 | 2018-07-30 | Grinding apparatus |
CN201810920969.9A CN109420947B (zh) | 2017-08-22 | 2018-08-14 | 磨削装置 |
KR1020180096551A KR102531221B1 (ko) | 2017-08-22 | 2018-08-20 | 연삭 장치 |
TW107129073A TWI795428B (zh) | 2017-08-22 | 2018-08-21 | 磨削裝置 |
US16/107,538 US11383351B2 (en) | 2017-08-22 | 2018-08-21 | Grinding apparatus |
DE102018214078.2A DE102018214078B4 (de) | 2017-08-22 | 2018-08-21 | Schleifvorrichtung |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017159240A JP6974979B2 (ja) | 2017-08-22 | 2017-08-22 | 研削装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2019038042A JP2019038042A (ja) | 2019-03-14 |
JP6974979B2 true JP6974979B2 (ja) | 2021-12-01 |
Family
ID=65321903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2017159240A Active JP6974979B2 (ja) | 2017-08-22 | 2017-08-22 | 研削装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US11383351B2 (ja) |
JP (1) | JP6974979B2 (ja) |
KR (1) | KR102531221B1 (ja) |
CN (1) | CN109420947B (ja) |
DE (1) | DE102018214078B4 (ja) |
SG (1) | SG10201806505XA (ja) |
TW (1) | TWI795428B (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102565411B1 (ko) * | 2018-06-22 | 2023-08-10 | 삼성디스플레이 주식회사 | 기판 연마 장치 |
JP7534142B2 (ja) * | 2020-07-16 | 2024-08-14 | 株式会社岡本工作機械製作所 | ドレッシング装置及び研磨装置 |
JP7621755B2 (ja) | 2020-08-25 | 2025-01-27 | 株式会社ディスコ | 研削ホイール、及びウエーハの研削方法 |
CN113510601B (zh) * | 2021-09-13 | 2021-11-19 | 南通迅腾精密设备有限公司 | 一种半导体加工用抛光装置 |
JP2023076059A (ja) * | 2021-11-22 | 2023-06-01 | 株式会社ディスコ | クリープフィード研削装置 |
CN117697554B (zh) * | 2024-02-05 | 2024-05-17 | 华海清科股份有限公司 | 晶圆加工系统、装置、方法及晶圆减薄设备 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6364744B1 (en) * | 2000-02-02 | 2002-04-02 | Agere Systems Guardian Corp. | CMP system and slurry for polishing semiconductor wafers and related method |
JP2001284303A (ja) | 2000-03-29 | 2001-10-12 | Disco Abrasive Syst Ltd | 研削装置 |
JP3737787B2 (ja) * | 2002-07-16 | 2006-01-25 | 株式会社東芝 | 半導体装置の製造方法 |
JP2013123792A (ja) * | 2011-12-16 | 2013-06-24 | Fujitsu Ltd | 半導体装置の製造方法及び研削装置 |
CN103839854A (zh) * | 2012-11-23 | 2014-06-04 | 北京北方微电子基地设备工艺研究中心有限责任公司 | 半导体加工设备及其去气腔室和加热组件 |
JP6016301B2 (ja) * | 2013-02-13 | 2016-10-26 | 昭和電工株式会社 | 単結晶SiC基板の表面加工方法、その製造方法及び単結晶SiC基板の表面加工用研削プレート |
JP6358835B2 (ja) * | 2014-04-09 | 2018-07-18 | 株式会社ディスコ | 研削装置 |
CN104669075B (zh) * | 2014-12-08 | 2017-08-04 | 沈阳工业大学 | 金刚石刀具光催化辅助刃磨方法及装置 |
JP6417227B2 (ja) * | 2015-01-27 | 2018-10-31 | 株式会社ディスコ | 切削ブレード及び切削装置並びにウエーハの加工方法 |
JP6475518B2 (ja) * | 2015-03-03 | 2019-02-27 | 株式会社ディスコ | ウエーハの加工方法 |
JP6462422B2 (ja) * | 2015-03-03 | 2019-01-30 | 株式会社ディスコ | 切削装置及びウエーハの加工方法 |
CN106032036B (zh) * | 2015-03-10 | 2019-09-06 | 株式会社迪思科 | 切削装置 |
CN104907919B (zh) * | 2015-06-18 | 2017-07-07 | 浙江工商大学 | 一种基于研磨盘表面自生长的连续研磨机构 |
CN105563341A (zh) * | 2016-02-25 | 2016-05-11 | 清华大学 | 用于cmp抛光液的紫外催化方法 |
JP6912284B2 (ja) * | 2017-06-23 | 2021-08-04 | 株式会社ディスコ | 研削装置 |
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2017
- 2017-08-22 JP JP2017159240A patent/JP6974979B2/ja active Active
-
2018
- 2018-07-30 SG SG10201806505XA patent/SG10201806505XA/en unknown
- 2018-08-14 CN CN201810920969.9A patent/CN109420947B/zh active Active
- 2018-08-20 KR KR1020180096551A patent/KR102531221B1/ko active Active
- 2018-08-21 US US16/107,538 patent/US11383351B2/en active Active
- 2018-08-21 TW TW107129073A patent/TWI795428B/zh active
- 2018-08-21 DE DE102018214078.2A patent/DE102018214078B4/de active Active
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US11383351B2 (en) | 2022-07-12 |
DE102018214078A1 (de) | 2019-02-28 |
TW201913801A (zh) | 2019-04-01 |
US20190061109A1 (en) | 2019-02-28 |
KR102531221B1 (ko) | 2023-05-10 |
SG10201806505XA (en) | 2019-03-28 |
DE102018214078B4 (de) | 2024-11-14 |
TWI795428B (zh) | 2023-03-11 |
CN109420947B (zh) | 2022-09-02 |
CN109420947A (zh) | 2019-03-05 |
KR20190021175A (ko) | 2019-03-05 |
JP2019038042A (ja) | 2019-03-14 |
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