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Most current generation optical disk systems use an astigmatic lens to generate their focus-error-signals (FES). In this presentation we describe a novel technique for generating the FES using a ring lens.1 We show that the new scheme generates a larger FES slope and lower "feedthrough" (induced on the FES by track-crossings during the seek operation) than the astigmatic technique.
© 1994 Optical Society of America
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