Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate

The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price. A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () for co...

Full description

Saved in:
Bibliographic Details
Main Authors Takagi, Kazuaki, Hibino, Kunio, Tokunaga, Tomokazu, Okuyama, Fujio, Onoda, Minoru
Format Patent
LanguageEnglish
Published 13.04.2004
Online AccessGet full text

Cover

Abstract The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price. A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
AbstractList The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities and at a low price. A glass material () is placed in a forming die including a pair of upper and lower dies () and a control member () for controlling the space between the upper and the lower die, and then heated, softened, and molded by pressure into a glass substrate in the shape of a parallel plate. The amount of thermal contraction of the control member is smaller than that of the glass material. Therefore, the glass substrate is released from the die when cooled after molding. The present invention can provide a glass substrate that is excellent in smoothness and form accuracy of the surface, and that is suitable for recording media such as magnetic disks that are inexpensive and suitable for mass production.
Author Onoda, Minoru
Takagi, Kazuaki
Hibino, Kunio
Okuyama, Fujio
Tokunaga, Tomokazu
Author_xml – sequence: 1
  fullname: Takagi, Kazuaki
– sequence: 2
  fullname: Hibino, Kunio
– sequence: 3
  fullname: Tokunaga, Tomokazu
– sequence: 4
  fullname: Okuyama, Fujio
– sequence: 5
  fullname: Onoda, Minoru
BookMark eNqNjDsOwjAQBV1Awe8OewCQQEiE1HzEAejREm8cC3uNvHbN1YlRKkRB8TTFjN5UjTgwTdTraAmQNRiHIuAxUbTooA2xzFs2g5J8lxR7vwRPqQv603jk3GKTcvxZlmePhinZBrSVx3cyV-MWndBi4EzB-XQ9XFZZnr3mJDcTsWC9qzb7qq63fyRv_EFL1g
ContentType Patent
CorporateAuthor Matsushita Electric Industrial Co., Ltd
CorporateAuthor_xml – name: Matsushita Electric Industrial Co., Ltd
DBID EFH
DatabaseName USPTO Issued Patents
DatabaseTitleList
Database_xml – sequence: 1
  dbid: EFH
  name: USPTO Issued Patents
  url: http://www.uspto.gov/patft/index.html
  sourceTypes: Open Access Repository
DeliveryMethod fulltext_linktorsrc
ExternalDocumentID 06718799
GroupedDBID EFH
ID FETCH-uspatents_grants_067187993
IEDL.DBID EFH
IngestDate Sun Mar 05 22:32:02 EST 2023
IsOpenAccess true
IsPeerReviewed false
IsScholarly false
Language English
LinkModel DirectLink
MergedId FETCHMERGED-uspatents_grants_067187993
OpenAccessLink https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6718799
ParticipantIDs uspatents_grants_06718799
PatentNumber 6718799
PublicationCentury 2000
PublicationDate 20040413
PublicationDateYYYYMMDD 2004-04-13
PublicationDate_xml – month: 04
  year: 2004
  text: 20040413
  day: 13
PublicationDecade 2000
PublicationYear 2004
References Komiyama et al. (5938807) 19990800
Menihan et al. (5125945) 19920600
(1-176237) 19890700
(62-252331) 19871100
Hirota et al. (4836840) 19890600
Richards et al. (5762676) 19980600
Koyama et al. (6306786) 20011000
Hirota (5013348) 19910500
Sakamoto (5770294) 19980600
(7-215721) 19950800
(00/66504) 20001100
(64-79023) 19890300
Takagi et al. (5817161) 19981000
Shigyo et al. (5173100) 19921200
(63-79727) 19880400
(2-26843) 19900100
(6-271323) 19940900
References_xml – year: 19890600
  ident: 4836840
  contributor:
    fullname: Hirota et al.
– year: 19871100
  ident: 62-252331
– year: 19980600
  ident: 5762676
  contributor:
    fullname: Richards et al.
– year: 19900100
  ident: 2-26843
– year: 20001100
  ident: 00/66504
– year: 19890700
  ident: 1-176237
– year: 19910500
  ident: 5013348
  contributor:
    fullname: Hirota
– year: 19921200
  ident: 5173100
  contributor:
    fullname: Shigyo et al.
– year: 19950800
  ident: 7-215721
– year: 19990800
  ident: 5938807
  contributor:
    fullname: Komiyama et al.
– year: 19981000
  ident: 5817161
  contributor:
    fullname: Takagi et al.
– year: 19920600
  ident: 5125945
  contributor:
    fullname: Menihan et al.
– year: 19940900
  ident: 6-271323
– year: 19890300
  ident: 64-79023
– year: 19880400
  ident: 63-79727
– year: 19980600
  ident: 5770294
  contributor:
    fullname: Sakamoto
– year: 20011000
  ident: 6306786
  contributor:
    fullname: Koyama et al.
Score 2.597187
Snippet The present invention relates to a method for producing magnetic disk glass substrates suitable for recording media such as magnetic disks in large quantities...
SourceID uspatents
SourceType Open Access Repository
Title Die and glass material for forming glass substrate, method for manufacturing glass substrate, and magnetic disk glass substrate
URI https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6718799
hasFullText 1
inHoldings 1
isFullTextHit
isPrint
link http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwfV3dS8MwED-2IahPioqbH-TBR6O1XdrmWVeKoOxBYW-jaVIZ2nSsLT76r3uXziGKPuQldxyXHMldwt3vAC5yEUrhERieJws-zpXmKhqH3AgVK19LUxj673h4DNPn8f1MzHqQbmphSjxGfIm61FdtvWwql1yJ13tneN6BPxNGoCX0gXf7VmV6qovrMKK-2bIP_dij1K5Jku7CNorAkM029TenkezB1tTN7kPP2AP4uFsYhu925gJWhpGiMz7DqJFGiT5kTapRLQcae8m6Bs-Op8xsS2UIrq7wNydJxlVZKkpkelG__mQ5BJZMnm5TvtF2_rKiLJi5t15VcAQDW1lzDMzkUsWByX2Fj5vC0yqIYiHJyYTGz4QcwvBPMaN_aCew85WUchOcwqBZteYM_W2jzt1mfgKTb48n
link.rule.ids 230,309,786,808,891,64394
linkProvider USPTO
linkToPdf http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwfV1LT8MwDLbGQDxOIECMZw4cKZS-c2arymvqAaTdqqZN0QRNp7UVR_46djomBIJDLollObGSz4nsLwDnmetx1yQyPJMXhpOJ3BC-4xnSFYGwci4LSe8dj2MvenbuJu6kB9GyFqbEbWTM0Jb6sq1nTaWTK_F47xxvdOTPxBGoiH3gXb1VaR7nxZXn07_ZfAVWCWOJRX8URluwgUowaFNN_Q02wm1Yi3XvDvSk2oWP4VQyvLkzHbIyjBW1-xnGjdRKRJHFUI2GadrYC9Z98axlylS1VIigKwt_S5JmnJeiskSWT-vXnyJ7wMLR001kLK1NXuaUB5OYi3nZ-9BXlZIHwGTGRWDLzBJ4vSnMXNh-4HKCGU9aqcsHMPhTzeE_Y2ewHg_D5OF2fH8Em18ZKtf2MfSbeStPEHwbcarX9RO3hpIh
openUrl ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Apatent&rft.title=Die+and+glass+material+for+forming+glass+substrate%2C+method+for+manufacturing+glass+substrate%2C+and+magnetic+disk+glass+substrate&rft.inventor=Takagi%2C+Kazuaki&rft.inventor=Hibino%2C+Kunio&rft.inventor=Tokunaga%2C+Tomokazu&rft.inventor=Okuyama%2C+Fujio&rft.inventor=Onoda%2C+Minoru&rft.number=6718799&rft.date=2004-04-13&rft.externalDBID=n%2Fa&rft.externalDocID=06718799