专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH04270948A METHOD FOR DETECTING SURFACE FLAW OF GLASS 失效
公开(公告)号：JPH04270948A
公开(公告)日：1992-09-28
申请号：JP5613191
申请日：1991-02-27
申请人： ASAHI GLASS CO LTD
发明人： YAMAUCHI HIDEO , MATSUI ATSUSHI
IPC分类号： G01N21/88 , G01N21/958
摘要： PURPOSE:To detect a flaw separately from other defect by judging that two cells are continuous when the interval between two cells whose defects are detected is preset length or less to perform continuation processing. CONSTITUTION:An inspection area is divided into arbitrary cells and, when the interval between two cells judged to have a defect is equal to or less than preset length, they are regarded to be continuous ones. For example, when the length of one side of a cell is set to 100mum and the interval between two cells having a minute flaw is 100mum or less, two cells are judged to be continuous to perform continuation processing and this flaw is detected as 100mum. When the interval between two cells having a flaw is 300mum or less, by the continuation processing of two cells, the flaw is detected as 700mum and the length of dust is detected as 200mum. When a defect longer than 200mum is preset as an inferior product and a defect of 200mum or less is preset as a good product, dust can be judged to be a good product and a flaw can be judged to be an inferior product.

2. 发明专利

JPS6437718A PRODUCTION OF SUBSTRATE FOR MAGNETIC DISK 失效
公开(公告)号：JPS6437718A
公开(公告)日：1989-02-08
申请号：JP19373187
申请日：1987-08-04
申请人： ASAHI GLASS CO LTD
发明人： KIJIMA SHUN , MATSUI ATSUSHI
IPC分类号： G11B5/84 , C03C15/00 , G11B5/73 , G11B5/82
摘要： PURPOSE:To easily obtain the roughness required for a media by bringing a gaseous mixture contg. hydrogen fluoride in an inert gas into contact with a glass substrate kept in a specific temp. range. CONSTITUTION:The gaseous mixture contg. 0.01-10mol.% hydrogen fluoride in the inert gas is brought into contact with a glass stock plate kept in the 5-90 deg.C range, by which ruggedness is formed on the surface of the glass stock plate and the substrate for a magnetic disk is obtd. The max. height (Rmax) of the surface roughness consisting of ruggedness is required to be =50Angstrom at 50mum reference length; more preferably said height is maintained at

4. 发明专利

JPS6467714A GLASS SUBSTRATE FOR MAGNETIC DISK AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS6467714A
公开(公告)日：1989-03-14
申请号：JP22403487
申请日：1987-09-09
申请人： ASAHI GLASS CO LTD
发明人： MATSUI ATSUSHI , SERA TAKAAKI , KIJIMA SHUN
IPC分类号： G11B5/82 , G11B5/73 , G11B5/84
摘要： PURPOSE:To improve a magnetic characteristic by forming a surface to be finely rugged and obtaining the rounded top of a projecting part on the rugged surface. CONSTITUTION:The surface to be rugged is formed by executing a chemical etching processing to a glass surface and next, a mechanical grinding processing is executed to this surface. Accordingly, the top of the projecting part is made rounded on the surface to be equally and finely rugged. Here, preferably the maximum height of the surface roughness due to the ruggedness is =50Angstrom in the reference length 50mum. Thus, the magnetic characteristic of a CSS characteristic, a head stick property and an S/N, etc., are improved.

6. 发明专利

JPH04269647A GLASS SURFACE INSPECTION METHOD 失效
公开(公告)号：JPH04269647A
公开(公告)日：1992-09-25
申请号：JP5335791
申请日：1991-02-25
申请人： ASAHI GLASS CO LTD
发明人： HATANO TAKASHI , YAMAUCHI HIDEO , MATSUI ATSUSHI
IPC分类号： G01B21/30 , G01N21/88 , G01N21/958
摘要： PURPOSE:To highly reliably detect a part on which a laser beam is projected and irregularities are not formed without any dependence on the ability of a worker by comparing a scattered light quantity at that part with that at other part. CONSTITUTION:A laser beam is projected on a glass surface having a part B on which irregularities are not formed in a part A on which micro irregularities are formed. When reflected and scattered light from a glass surface is detected at this time, the laser light projected on the part B is almost transmitted through the glass and the scattered light output thereof is low, but the scattered light output at the part A is high. Accordingly, its comparison can be comparison by the use of a device without any dependence on visual observation and thereby time reduction, reliability improvement and cost reduction of the inspection can be achieved.

你已经成功收藏专利！

检索式保存成功!

IPRDB