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04/24/08 - USPTO Class 369 |  1 views | #20080094976 | Prev - Next | About this Page  369 rss/xml feed  monitor keywords

Optical pickup apparatus and optical disc apparatus using same

USPTO Application #: 20080094976
Title: Optical pickup apparatus and optical disc apparatus using same
Abstract: A method of detecting a servo signal of an optical disc having a plurality of recording layers includes focusing and irradiating a laser light onto the optical disc, dividing a laser light reflected from the optical disc into a plurality of reflected laser lights by a division element, wherein each of said reflected laser lights having a different outgoing direction, and irradiating the reflected laser lights onto a plurality of light receiving parts of a light detector. A focus error signal is detected under a knife edge method and a tracking error signal is detected. (end of abstract)



Agent: Antonelli, Terry, Stout & Kraus, LLP - Arlington, VA, US
Inventors: Toshimasa Kamisada, Yasuo Kitada, Kazuyoshi Yamazaki, Tomoto Kawamura, Yoshiro Konishi
USPTO Applicaton #: 20080094976 - Class: 369 5315 (USPTO)

Optical pickup apparatus and optical disc apparatus using same description/claims


The Patent Description & Claims data below is from USPTO Patent Application 20080094976, Optical pickup apparatus and optical disc apparatus using same.

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Previous Patent Application:
Method of optimizing the write power for recording marks in an information layer of a record carrier and recording device using such an optimizing method
Next Patent Application:
Tracking error signal calibration method, and disc drive implementing such method
Industry Class:
Dynamic information storage or retrieval

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