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:
Jan. 07, 2014
Filed:
Sep. 28, 2005
David M. Pereira, Austin, TX (US);
David M. Pereira, Austin, TX (US);
Dell Products L.P., Round Rock, TX (US);
Abstract
An optical drive laser diode drive current has a High Frequency Modulation (HFM) signal superimposed to aid optical medium readability. The HFM signal is provided by an HFM oscillator interfaced with the laser diode drive current to provide the HFM signal with a frequency from within a predetermined range. A frequency controller varies the frequency of the HFM signal over time to reduce RF emissions associated with the HFM signal. For instance, the HFM signal frequency is varied in a swept sawtooth or triangle pattern. As another example, the HFM frequency is varied with random selections of frequencies from a predetermined frequency range.