Optical memory apparatus

Details Optical memory apparatus Optical memory apparatus

G - Physics

11

B

352/32.2

G11B 7/00 (2006.01)

Patent

CA 1196098

Abstract: In an optical memory apparatus predetermined information is optically recorded on a recording medium along guide grooves previously formed and can then be played back. The invention is concerned with improvements in apparatus for accurately positioning the light beam at a desired target guide groove. Using a tracking signal and a signal indicating the quantity of reflected light at the time at which a projected light beam passes across the guide grooves, the directions in which the light beam passes across the guide grooves and the number of guide grooves to be passed are detected. Seek control is performed by adding and subtracting the numbers of the guide grooves to be passed, depending upon the directions of passage, and fine positioning is thereafter performed using this tracking signal. The invention provides high precision of accessing in a system that can have a track density one or two orders of magnitude higher than a conventional magnetic disc.

416313

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