Information recording/reproducing method capable of fast-accessi

Details Information recording/reproducing method capable of fast-accessi Information recording/reproducing method capable of fast-accessi

1991-02-22

1993-04-20

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

235476, 369 32, G06K 710

Patent

active

052045145

ABSTRACT:
A method of performing high-speed positioning of a light beam onto a desired track of a recording medium, such as an optical card, which has an ID portion formed on only one end portion of each of a plurality of parallel tracks. As seen in FIG. 1B, the ID portion 14 is formed by sequentially arranging an ID mark 21 representing the start of the ID portion 14 in a forward read operation, a PLL pull-in region 22 as a data separator in a forward read operation, a sync signal 23 representing the start of track information in a forward read operation, track (address) information 24, a sync signal 25 representing the start of track information in a reverse read operation, a PLL pull-in region 26 as a data separator in a reverse read operation, and an ID mark 27 representing the start of the ID portion 14 in a reverse read operation. The data information recorded on the data portion 15 is to be read either in the forward direction or in the reverse direction. When the light beam is located on the other end portion of each track, the light beam is relatively moved in a direction to cross the tracks. Subsequently, the ID portion is read while the light beam is moved along the tracks toward one end portion, thereby accessing the desired track.

REFERENCES:
patent: 4797872 (1989-01-01), Rokutan
patent: 4885458 (1989-12-01), Horiguchi et al.

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