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:
Apr. 24, 2012
Filed:
Dec. 29, 2010
Eric LI, Milpitas, CA (US);
Yi Zhang, Mountain View, CA (US);
Silicon Core Technology, Inc., Milpitas, CA (US);
Abstract
A writing current circuit () supplies a controlled electrical current to a laser diode () for recording data swiftly onto a DVD (). A plurality of current sources () in the writing current circuit () supply electrical current directly to the laser diode (). Each current source () respectively receives a single output signal from a current control register () included in the writing current circuit () which activates or deactivates the current source () for supplying a particular quantity of current to the laser diode (). In one aspect, a pair of current reference signals received by the current source () control electrical current supply to the diode (). Incorporated into these controlling reference signals is a simulation of electrical characteristics of the diode (). In another aspect, each current source () responds to a logical inverse of the output signal from the current control register () for controlling overshoot in voltage applied across the diode ().