JPS54154310A - Magnetic disc apparatus - Google Patents

Magnetic disc apparatus

Info

Publication number
JPS54154310A
JPS54154310A JP6254478A JP6254478A JPS54154310A JP S54154310 A JPS54154310 A JP S54154310A JP 6254478 A JP6254478 A JP 6254478A JP 6254478 A JP6254478 A JP 6254478A JP S54154310 A JPS54154310 A JP S54154310A
Authority
JP
Japan
Prior art keywords
discs
portions
shroud
parts
outside circumferential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6254478A
Other languages
Japanese (ja)
Inventor
Nakahiko Matsuo
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP6254478A priority Critical patent/JPS54154310A/en
Publication of JPS54154310A publication Critical patent/JPS54154310A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds

Abstract

PURPOSE:To considerably reduce the vibrations in the vertical directions of the outside circumferential part of discs by providing a channel limiting member in which the portions of magnetic discs are concave and the portions between said discs are convex to the inside circumferential wall surface within a shroud. CONSTITUTION:A shroud 1 is constituted by two shroud halves 1a, 1b of a semi- circular section. A channel limiting member 8 of a section like pulse waves having concave parts 8a for the portions corresponding to magnetic discs 2 and convex parts 8b for the portions between the discs 2 is provided to the circumferential wall surface on the inner side of the shroud halves 1a, 1b. In this way, extremely narrow channels are formed on the outside circumferential parts of the discs 2. As a result, the production of turbulent flow at the outside circumferential parts of the rotating discs 2 is forcefully inhibited and only the air of the straightened flow flows in the channels 9, thus the vibration amplitudes in the vertical directions of the outside circumferential portions of the disc may be considerably reduced.
JP6254478A 1978-05-25 1978-05-25 Magnetic disc apparatus Pending JPS54154310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6254478A JPS54154310A (en) 1978-05-25 1978-05-25 Magnetic disc apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6254478A JPS54154310A (en) 1978-05-25 1978-05-25 Magnetic disc apparatus

Publications (1)

Publication Number Publication Date
JPS54154310A true JPS54154310A (en) 1979-12-05

Family

ID=13203273

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6254478A Pending JPS54154310A (en) 1978-05-25 1978-05-25 Magnetic disc apparatus

Country Status (1)

Country Link
JP (1) JPS54154310A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60136980A (en) * 1983-12-26 1985-07-20 Hitachi Ltd Magnetic disc device
US4660110A (en) * 1982-11-08 1987-04-21 Hitachi, Ltd. Magnetic disk storage device with shroud enclosing disk assembly
US4821130A (en) * 1987-09-04 1989-04-11 Digital Equipment Corporation Disk extender baffles
US6239943B1 (en) * 1994-07-22 2001-05-29 Seagate Technology Llc Squeeze film damping for a hard disc drive
WO2001097221A2 (en) * 2000-06-14 2001-12-20 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
US6493310B1 (en) 1998-04-03 2002-12-10 Samsung Electronics Co., Ltd. Noise damping device for rotating body and disk player
WO2003021596A1 (en) * 2001-08-31 2003-03-13 3M Innovative Properties Company Disk drive having airflow adjusting mechanism and thin-plate member incorporated therein
US6751050B1 (en) * 1998-02-13 2004-06-15 Hitachi, Ltd. Magnetic disc unit
US6961219B2 (en) 2001-08-31 2005-11-01 3M Innovative Properties Company Disk drive head positioner with thin-film air-flow adjusting mechanism, thin film member and method of manufacturing
US7072140B2 (en) 2001-08-31 2006-07-04 3M Innovative Properties Company Disk drive having airflow adjusting mechanism and thin-plate member incorporated therein
US7346914B2 (en) * 2001-10-18 2008-03-18 Yamaha Corporation Optical disk drive
JP2008243370A (en) * 2008-06-02 2008-10-09 Naruse Atsushi Disk fluttering damping device
US8199426B2 (en) * 2008-03-24 2012-06-12 Hitachi Global Storage Technologies, Netherlands B.V. Method and system for providing hard disk shrouds with aerodynamic fences for suppressing flow induced disk excitation
US20120293890A1 (en) * 2011-05-17 2012-11-22 Charles Allan Brown System, method and apparatus for enhancing air flow circulation in disk drives

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660110A (en) * 1982-11-08 1987-04-21 Hitachi, Ltd. Magnetic disk storage device with shroud enclosing disk assembly
JPH0447918B2 (en) * 1983-12-26 1992-08-05 Hitachi Ltd
JPS60136980A (en) * 1983-12-26 1985-07-20 Hitachi Ltd Magnetic disc device
US4821130A (en) * 1987-09-04 1989-04-11 Digital Equipment Corporation Disk extender baffles
US6239943B1 (en) * 1994-07-22 2001-05-29 Seagate Technology Llc Squeeze film damping for a hard disc drive
US6751050B1 (en) * 1998-02-13 2004-06-15 Hitachi, Ltd. Magnetic disc unit
US7643245B2 (en) 1998-02-13 2010-01-05 Hitachi Global Storage Technologies Japan, Ltd. Magnetic disc unit with gap between magnetic disc and shroud
US7336440B2 (en) 1998-02-13 2008-02-26 Hitachi Global Storage Technologies Japan, Ltd. Magnetic disc unit with gap between magnetic disc and shroud
US7072141B2 (en) 1998-02-13 2006-07-04 Hitachi Global Storage Technologies Japan, Ltd. Magnetic disc unit with range of gap between disc and shroud
US6493310B1 (en) 1998-04-03 2002-12-10 Samsung Electronics Co., Ltd. Noise damping device for rotating body and disk player
WO2001097221A2 (en) * 2000-06-14 2001-12-20 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
GB2379321B (en) * 2000-06-14 2004-04-21 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
US6989959B2 (en) * 2000-06-14 2006-01-24 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
GB2379321A (en) * 2000-06-14 2003-03-05 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
WO2001097221A3 (en) * 2000-06-14 2002-06-06 Seagate Technology Llc Drive level flow-field conditioning to reduce flow field turbulence
US6961219B2 (en) 2001-08-31 2005-11-01 3M Innovative Properties Company Disk drive head positioner with thin-film air-flow adjusting mechanism, thin film member and method of manufacturing
US7072140B2 (en) 2001-08-31 2006-07-04 3M Innovative Properties Company Disk drive having airflow adjusting mechanism and thin-plate member incorporated therein
WO2003021596A1 (en) * 2001-08-31 2003-03-13 3M Innovative Properties Company Disk drive having airflow adjusting mechanism and thin-plate member incorporated therein
US7346914B2 (en) * 2001-10-18 2008-03-18 Yamaha Corporation Optical disk drive
US8199426B2 (en) * 2008-03-24 2012-06-12 Hitachi Global Storage Technologies, Netherlands B.V. Method and system for providing hard disk shrouds with aerodynamic fences for suppressing flow induced disk excitation
JP2008243370A (en) * 2008-06-02 2008-10-09 Naruse Atsushi Disk fluttering damping device
US20120293890A1 (en) * 2011-05-17 2012-11-22 Charles Allan Brown System, method and apparatus for enhancing air flow circulation in disk drives

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