JP6976650B2 - ウェーハの加工方法 - Google Patents
ウェーハの加工方法 Download PDFInfo
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- JP6976650B2 JP6976650B2 JP2017172835A JP2017172835A JP6976650B2 JP 6976650 B2 JP6976650 B2 JP 6976650B2 JP 2017172835 A JP2017172835 A JP 2017172835A JP 2017172835 A JP2017172835 A JP 2017172835A JP 6976650 B2 JP6976650 B2 JP 6976650B2
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- 238000003672 processing method Methods 0.000 title description 4
- 239000003566 sealing material Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 24
- 239000008393 encapsulating agent Substances 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 238000003331 infrared imaging Methods 0.000 claims description 6
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims description 4
- 238000002679 ablation Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000003754 machining Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 3
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0823—Devices involving rotation of the workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
-
- 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
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
- H01L21/561—Batch processing
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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
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
- H01L21/565—Moulds
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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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/68—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for positioning, orientation or alignment
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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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/544—Marks applied to semiconductor devices or parts, e.g. registration marks, alignment structures, wafer maps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
- B23K2103/42—Plastics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/544—Marks applied to semiconductor devices or parts
- H01L2223/54426—Marks applied to semiconductor devices or parts for alignment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/11—Manufacturing methods
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3114—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Dicing (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Laser Beam Processing (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
(1)半導体ウェーハ(以下、ウェーハと略称することがある)の表面にデバイス(回路)及びバンプと呼ばれる外部接続端子を形成する。
(2)ウェーハの表面側から分割予定ラインに沿ってウェーハを切削し、デバイスチップの仕上がり厚さに相当する深さの切削溝を形成する。
(3)ウェーハの表面をカーボンブラック入りの封止材で封止する。
(4)ウェーハの裏面側をデバイスチップの仕上がり厚さまで研削して切削溝中の封止材を露出させる。
(5)ウェーハの表面はカーボンブラック入りの封止材で封止されているため、ウェーハ表面の外周部分の封止材を除去してターゲットパターン等のアライメントマークを露出させ、このアライメントマークに基づいて切削すべき分割予定ラインを検出するアライメントを実施する。
(6)アライメントに基づいて、ウェーハの表面側から分割予定ラインに沿ってウェーハを切削して、表面及び全側面が封止材で封止された5Sモールドパッケージに分割する。
11 半導体ウェーハ
13 分割予定ライン
14 切削ブレード
15 デバイス
16 アライメントユニット
17 電極バンプ
18,18A 撮像ユニット
20 封止材
23 切削溝
25 レーザー加工溝
26 研削ユニット
27 デバイスチップ
34 研削ホイール
38 研削砥石
46 レーザーヘッド(集光器)
Claims (2)
- 交差して形成された複数の分割予定ラインによって区画された表面の各領域にそれぞれ複数のバンプを有するデバイスが形成されたウェーハの加工方法であって、
該ウェーハの表面側から該分割予定ラインに沿って切削ブレードによってデバイスチップの仕上がり厚さに相当する深さの切削溝を形成する切削溝形成工程と、
該切削溝形成工程を実施した後、該切削溝を含む該ウェーハの表面を封止材で封止する封止工程と、
該封止工程を実施した後、該ウェーハの裏面側から該デバイスチップの仕上がり厚さまで該ウェーハを研削して該切削溝中の該封止材を露出させる研削工程と、
該研削工程を実施した後、該ウェーハの表面側から赤外線撮像手段によって該封止材を透過してウェーハの表面側を撮像してアライメントマークを検出し、該アライメントマークに基づいてレーザー加工すべき該分割予定ラインを検出するアライメント工程と、
該アライメント工程を実施した後、該ウェーハの表面側から該分割予定ラインに沿って該封止材に対して吸収性を有する波長のレーザービームを照射して、アブレーション加工により該封止材によって表面及び4側面が囲繞された個々のデバイスチップに分割する分割工程と、を備え、
該封止工程では、該赤外線撮像手段が受光する赤外線が透過するような透過性を有しカーボンブラックを含む該封止材によって該ウェーハの表面が封止され、
該カーボンブラックの含有率は0.1質量%以上0.2質量%以下であることを特徴とするウェーハの加工方法。 - 前記アライメント工程で用いる前記赤外線撮像手段はInGaAs撮像素子を含む請求項1記載のウェーハの加工方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017172835A JP6976650B2 (ja) | 2017-09-08 | 2017-09-08 | ウェーハの加工方法 |
KR1020180103485A KR102627958B1 (ko) | 2017-09-08 | 2018-08-31 | 웨이퍼의 가공 방법 |
CN201811036196.4A CN109494189B (zh) | 2017-09-08 | 2018-09-06 | 晶片的加工方法 |
SG10201807733PA SG10201807733PA (en) | 2017-09-08 | 2018-09-07 | Wafer processing method |
DE102018215245.4A DE102018215245A1 (de) | 2017-09-08 | 2018-09-07 | Bearbeitungsverfahren für einen Wafer |
TW107131420A TWI788410B (zh) | 2017-09-08 | 2018-09-07 | 晶圓之加工方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017172835A JP6976650B2 (ja) | 2017-09-08 | 2017-09-08 | ウェーハの加工方法 |
Publications (2)
Publication Number | Publication Date |
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JP2019050248A JP2019050248A (ja) | 2019-03-28 |
JP6976650B2 true JP6976650B2 (ja) | 2021-12-08 |
Family
ID=65441494
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Application Number | Title | Priority Date | Filing Date |
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JP2017172835A Active JP6976650B2 (ja) | 2017-09-08 | 2017-09-08 | ウェーハの加工方法 |
Country Status (6)
Country | Link |
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JP (1) | JP6976650B2 (ja) |
KR (1) | KR102627958B1 (ja) |
CN (1) | CN109494189B (ja) |
DE (1) | DE102018215245A1 (ja) |
SG (1) | SG10201807733PA (ja) |
TW (1) | TWI788410B (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2023209909A1 (ja) * | 2022-04-27 | 2023-11-02 | ヤマハ発動機株式会社 | ダイシング装置、半導体チップの製造方法および半導体チップ |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003165893A (ja) * | 2001-11-30 | 2003-06-10 | Shin Etsu Chem Co Ltd | 半導体封止用エポキシ樹脂組成物及び半導体装置 |
JP2004006721A (ja) * | 2002-03-28 | 2004-01-08 | Toshiba Corp | 半導体装置 |
JP2003321594A (ja) * | 2002-04-26 | 2003-11-14 | Hitachi Chem Co Ltd | 封止用エポキシ樹脂成形材料及び電子部品装置 |
US6649445B1 (en) * | 2002-09-11 | 2003-11-18 | Motorola, Inc. | Wafer coating and singulation method |
JP4168988B2 (ja) * | 2004-07-21 | 2008-10-22 | 沖電気工業株式会社 | 半導体装置の製造方法 |
JP5948034B2 (ja) | 2011-09-27 | 2016-07-06 | 株式会社ディスコ | アライメント方法 |
JP2015023078A (ja) * | 2013-07-17 | 2015-02-02 | 株式会社ディスコ | ウエーハの加工方法 |
JP2016015438A (ja) | 2014-07-03 | 2016-01-28 | 株式会社ディスコ | アライメント方法 |
JP2017108089A (ja) * | 2015-12-04 | 2017-06-15 | 株式会社東京精密 | レーザ加工装置及びレーザ加工方法 |
-
2017
- 2017-09-08 JP JP2017172835A patent/JP6976650B2/ja active Active
-
2018
- 2018-08-31 KR KR1020180103485A patent/KR102627958B1/ko active IP Right Grant
- 2018-09-06 CN CN201811036196.4A patent/CN109494189B/zh active Active
- 2018-09-07 DE DE102018215245.4A patent/DE102018215245A1/de active Pending
- 2018-09-07 TW TW107131420A patent/TWI788410B/zh active
- 2018-09-07 SG SG10201807733PA patent/SG10201807733PA/en unknown
Also Published As
Publication number | Publication date |
---|---|
TWI788410B (zh) | 2023-01-01 |
KR102627958B1 (ko) | 2024-01-19 |
KR20190028301A (ko) | 2019-03-18 |
JP2019050248A (ja) | 2019-03-28 |
SG10201807733PA (en) | 2019-04-29 |
CN109494189A (zh) | 2019-03-19 |
DE102018215245A1 (de) | 2019-03-14 |
TW201913870A (zh) | 2019-04-01 |
CN109494189B (zh) | 2023-10-13 |
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