62200223-TBW 21-02-2001 16:15 Pagina 2 Thermo-Balanced Writing Thermo-Balanced Writing Thermo Balanced Writing for optimal recording
62200223-TBW 21-02-2001 16:15 Pagina 4 Thermo-Balanced Writing A new, patented, system addressing the problem of writing reliably to the very many brands of recordable CD media now on the market, not all of which are in conformance with the agreed international standards established for use in Philips CD-RW drives.
62200223-TBW 21-02-2001 16:15 Pagina 6 Thermo-Balanced Writing temperature Fig. 1,ThermoBalanced Writing: Typical Heat Profile during CD-R write phase.Goal of TBW is to ensure a correctly balanced heat profile during this phase. laser beam required temperature to burn a pit diameter of pit is smaller than diameter of laser spot laser spot Equally of course, if the pits come out too small or too light, then other reading errors can occur.
62200223-TBW 21-02-2001 16:15 Pagina 8 Thermo-Balanced Writing Unfortunately, there is no reliable way a consumer can judge what he or she is buying (as example, an authoritative quality logo on the disc packaging or verification of media confirmance), and so when an End user buys and "burns" what are, in effect, sub-standard discs, any resulting problems are liable to be attributed more often to the CD drive unit then to the disc.
62200223-TBW 21-02-2001 16:15 Pagina 10 Thermo-Balanced Writing If this initial test shows some discrepancies, then the algorithm goes to its main sequence. In one or more test burn/read iterations the required burn pulse data is recalculated, and if necessary, the disc is reassigned to the next lowest drive speed available.The calibration stops when the results show a correct performance within defined tolerances. The disc is then recorded with the revised conditions.
2200223-TBW 21-02-2001 16:15 Pagina 12 Thermo-Balanced Writing Fig.3 (Fig. 3a & 3b), Thermo- Balanced Writing: Thermal “cross-talk” is reduced by TBW. fig 3b: With TBW Land before pit Land before pit fig 3a: Without TBW Pit Pit The standard for Pit and Land length is represented by an intersection of the horizontal and vertical lines.
62200223-TBW 21-02-2001 16:15 Pagina 1 Thermo-Balanced Writing Philips Optical Storage Building SFH3 P.O.Box 80002 5600 JB Eindhoven The Netherlands www.components.philips.com © 2001 Royal Philips Electronics N.V. All rights reserved. Specifications are subject to change without prior notice. Reproduction in whole or part is prohibited without written consent of the copywright owner.