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. 29, 2011
Filed:
Jan. 07, 2008
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 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 electrical current to the laser diode (). In each current source (), electrical current flows to the laser diode () through a MOSFET output transistor () connected in series with the laser diode (). Each current source's MOSFET output transistor () has a gate insulating layer which is thinner than the gate insulating layer conventionally used for a MOSFET output transistor () that is energized by the electrical potential the it applied to the writing current circuit ().