Defocus error signal detection apparatus having phase comparators and a matrix circuit for an optical recording/reproduction system
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United States of America Patent
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Aug 22, 2006
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N/A
app pub date -
May 6, 2004
filing date -
Nov 17, 2000
priority date (Note) -
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Abstract
An error signal detection apparatus for an optical recording/reproducing system including a light source emitting a light beam and an objective lens focusing the light beam to form a light spot on a recording medium, the apparatus including: a photodetecting unit dividing at least a part of the light beam passed through the objective lens after being reflected/diffracted from an information stream of the recording medium into light beam portions, and detecting the light beam portions; and a signal processor detecting phase differences between detection signals from the light beam portions to detect a tangential error signal, a defocus error signal, and/or a radial tilt error signal.
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