The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1996
Filed:
May. 31, 1995
Peter M Baumgart, San Jose, CA (US);
Wing P Leung, Arcadia, CA (US);
Hung V Nguyen, San Jose, CA (US);
Thao A Nguyen, San Jose, CA (US);
Andrew C Tam, Saratoga, CA (US);
Anthony Wu, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A process for creating an array of bumps to texture a brittle nonmetallic surface, such as a glass substrate for data recording disks. The texturing process uses a laser to provide pulses of proper energy fluence to the brittle glass surface to produce a plurality of raised bumps in the surface. The bump creation is accomplished without unwanted micro-cracking or ejection of surface material by limiting the laser pulse fluence to a value in a narrow operating region discovered below the abrupt thermal shock fluence threshold for the brittle nonmetallic surface material. The process is also applicable to other brittle surface textures, such as those intended for use as 'stamping surfaces' for the contact reproduction of the negative of a surface pattern, such as an optical disk.