Patent ID: 6757227
Filing Date: 2004-06-29
Classification: G11B

Abstract:
An optical recording/reproducing apparatus for use in combination with recording media that differ in track pitch, or a recording medium having recording regions that differ in track pitch, said apparatus comprising:drive means operable with both of a first recording medium and a second recording medium and for rotating both of the first recording medium and the second recording medium at different times, a track pitch of the first recording medium being different than a track pitch of the second recording medium, and a thickness of a substrate of the first recording medium being a same thickness as a thickness of a substrate of the second recording medium; an optical head for applying light to the first recording medium and the second recording medium being rotated by the drive means at the different times, thereby to record data signals on the recording medium or reproducing data from the recording medium; and a signal-processing circuit for processing a signal detected by the optical head, wherein the optical head comprises a light source for emitting light, an objective lens for condensing the light emitted by the light source on the first recording medium and the second recording medium at the different times and signal-detecting means for receiving the light reflected from the first recording medium and the second recording medium at the different times, thereby to detect signals, and the objective lens has a numerical aperture NA, where 0.5