Optical information storing and reproducing device

Abstract

Abstract PURPOSE:To obtain an accurate tracking by using a pre-wobbling tracking error signal detected when a light spot crosses a pre-wobbling it string so as to correct a push-pull tracking error signal including offset detected from a pre-group having a depth of 1/8 wavelength. CONSTITUTION:Pre-wobbling tracking pits 20-1, 20-2 comprising >=1 set of elliptic pit arranged in advance to the left/right of a track at a header sector 121 an disc are arranged. In the recording/reproduction of data, a tracking error signal by the pre-wobbling method with accurate deviation without any offset from the track center of the optical spot position from the pre-wobbling pits 20-1, 20-2 arranged the header sector 121 is detected, the error signal is used to correct a push-pull tracking error signal 16 utilizing the diffracted light distribution from the pre-groups 15-1, 15-2 having a depth of 1/8 wavelength and including offset. Thus, the high S/N data recording and reproduction is attained.

Inventors

• 👤 Seiji Yonezawa
• 👤 成二 米澤
• 👤 Masatoshi Otake
• 👤 大竹　正利
• 👤 Sho Ito
• 👤 捷 伊藤

Bibliographic Details