A tracking error signal generating device using a four-segment detector in which signals from diagonally opposed elements are combined and the two so combined signals are phase compared. According to the invention, either before or during the combining, the output signals of the segments have high level...http://www.google.com/patents/US5258968?utm_source=gb-gplus-sharePatent US5258968 - Tracking error signal generating device for preventing offset of the generated tracking error signal
Tracking error signal generating device for preventing offset of the ...
