Optical disk tracking and seeking systems specific track formats

Details Optical disk tracking and seeking systems specific track formats Optical disk tracking and seeking systems specific track formats

1988-01-25

1989-11-07

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 369105, 369109, 369124, 369275, G11B 709, G11B 7007

Patent

active

048797081

ABSTRACT:
An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there is a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three bits are wobble pits and the third pit is used in clocking.

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