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:
Mar. 02, 1999
Filed:
Jan. 26, 1998
Petrus CJ. Hoeven, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
When writing a record carrier of an optically readable type, such as the rewritable CD-RW, the quality of the written information patterns is affected by contaminations of the surface due to dust and fingerprints. The inventors have found that the control of the writing power P should be inversely proportional to the measured reflection R, but less than an amount proportional thereto. A good control is achieved when P*.sqroot.R is maintained constant, and a control which is suitable for dealing with different contaminations can be achieved by maintaining P*R.sup.x constant, in which x has a value of between 0.5 and 0.8. The way in which the reflection R can be measured from the signal coming from side spots formed next to the track to be scanned is also described.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile