초록 ▼

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

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.

대표청구항 ▼

A method for manufacturing a data recording disk comprising the steps of: providing a glass base plate which has a surface, the glass base plate having a thermal shock threshold fluence level above which the glass base plate is fractured; polishing said surface; concentrating laser energy pulses upo

A method for manufacturing a data recording disk comprising the steps of: providing a glass base plate which has a surface, the glass base plate having a thermal shock threshold fluence level above which the glass base plate is fractured; polishing said surface; concentrating laser energy pulses upon a plurality of spaced-apart locations over a treatment area of said surface to produce a bump with a maximum diametral dimension Dd on said surface at each said spaced-apart location, wherein each laser energy pulse has a laser energy fluence fp at said each spaced-apart location which is limited to said thermal shock threshold fluence level; and depositing over said surface a film of magnetic data recording material to create a data recording layer.