Title:
ガラス、ガラス基板ブランクスおよびガラス基板それぞれの製造方法
Document Type and Number:
Japanese Patent JP4587257
Kind Code:
B2
Abstract:
Provided are a method for producing a glass suitable for an information recording medium required to have high qualities, a process for the production of a glass substrate blank from the above glass and a process for the production of a glass substrate from the above blank. The method is for the production of a glass containing an alkali metal element by melting a glass material in a glass melting apparatus and uses, as said melting apparatus, a melting apparatus whose glass-contact portion is made of a material containing zirconium and containing substantially no alkali metal element. In the process for the production of a glass substrate blank, the glass obtained by the above method is press-molded or is subjected to a float process, and in the process for the production of a glass substrate, the above glass substrate blank is lapped and polished.
Inventors:
Kazuo Ogino
Koji Suzuki
Koji Suzuki
Application Number:
JP2001325850A
Publication Date:
November 24, 2010
Filing Date:
October 24, 2001
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
C03B5/43; C03C3/083; C03C10/10; C03C19/00; G11B5/73; G11B5/84
Domestic Patent References:
| JP2001272178A | ||||
| JP2001180975A | ||||
| JP20007372A | ||||
| JP6287059A | ||||
| JP11130529A | ||||
| JP6259576A | ||||
| JP200176336A | ||||
| JP11343143A | ||||
| JP2000357318A | ||||
| JP2001172043A |
Attorney, Agent or Firm:
Shizuo Nakamura