US 5,293,568 AGranted

Track-address judging method

AssigneeOlympus Optical Co., Ltd.

InventorsMitsuo Oshiba, Kazutake Sugawara

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention reads out track addresses written onto ID sections of a recording medium, for example, from five, tracks of the plurality of tracks read out simultaneously, to execute demodulation and error correction. In case where the addresses are multiple-written onto the ID sections, the optical spot judges the track address of the desired track on the basis of the plurality of read-out track addresses until the optical spot passes through the remaining track address. Further, in case where there is only a single one of the track addresses written on said ID sections, the track addresses are read out one by one, are demodulated and are error-corrected. The track address of the desired track is judged on the basis of the plurality of read-out track addresses, prior to the fact that the optical spot enters an information recording area.

Claims14

Dependent claims

A track-address judging method which is used in an optical information recording and reproducing apparatus in which, with respect to a recording medium having a plurality of tracks, each of the plurality of tracks including at least one track address information section, track addresses being multiple-written respectively within each of the plurality of tracks, and each of the plurality of tracks including an information recording area executing at least one of recording and reproducing of the information, an optical spot being irradiated to the plurality of tracks of the recording medium, to simultaneously read out the information of the plurality of tracks for judging the track addresses of a desired track of said plurality of tracks, said method comprising the steps of:

simultaneously reading out one of the multiple-written track addresses for each of the plurality of tracks, from the track address information sections in at least two tracks of said plurality of tracks;
and
judging a track address of a desired track according to a comparison of each track address read out from at least two tracks in said reading step during a period of time the optical spot reaches the information recording area from the remaining multiple-written track addresses.

A track-address judging method which is used in an optical information recording and reproducing apparatus in which, with respect to a recording medium having a plurality of tracks, each of the plurality of tracks including at least one track address information section, one track address being written respectively within each of the plurality of tracks, and each of the plurality of tracks including an information recording area executing at least one of recording and reproducing of the information, an optical spot being irradiated to the plurality of tracks of the recording medium, to simultaneously read out the information of the plurality of tracks for judging the track addresses of a desired track of said plurality of tracks, said method comprising the steps of:

simultaneously reading out each of the track addresses from the track address information sections in at least two tracks of said plurality of tracks;
and
judging a track address of a desired track according to a comparison of each track address read out from at least two tracks in said reading step during a period of time the optical spot reaches the information recording area.

Dependencies are inferred from the claim text.

Facts

Application: 07/904,036Filed 25 Jun 1992
Priority: JP 3-15882228 Jun 1991
Granted: 8 Mar 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G11B 27/3027
On the same track as the main recording: used signal is digitally coded
G11B 7/08505
With provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing…: methods…
G11B 7/14
Heads, e.g. forming of the optical beam spot or modulation of the optical beam: specially adapted to record on, or to reproduce from, more than…
G11B
Information storage based on relative movement between record carrier and transducer