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:
Nov. 30, 2004
Filed:
Jan. 14, 2000
Bahram Ghaffarzadeh Kermani, Whitehall, PA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
The present invention provides an optical disk with pits and/or bumps which each contain a plurality of facets. Each facet of each pit and/or bump is intended for separate read back as an individual 'side' of the optical disk (much as vinyl records had two 'sides' for separate playback). The separate ‘sides’ of the optical disk formed by separate facets of each pit and/or bump can be read back either simultaneously or serially, either by a corresponding plurality of laser beams, or by a common laser beam which is positioned to a first orientation with respect to a rotating track to focus on a first set of facets of each pit and/or bump, and then repositioned to focus on a second set of facets of the same set of pits and/or bumps and thus to read a second ‘side’ of the optical disk. The technique may be extended to provide a single optical disk and even a single track of the optical disk with even more than two ‘sides’ by using three-, four- or five-sided pyramidal-shaped pits and/or bumps.