Optical card having optical grooves for access and wobbled marks

Details Optical card having optical grooves for access and wobbled marks Optical card having optical grooves for access and wobbled marks

1988-02-08

1991-01-15

Levy, Stuart S.

Registers

Records

Particular code pattern

235487, 235454, 369 4426, 3692753, 369 4413, G11B 7007, G06K 701

Patent

active

049856162

ABSTRACT:
An optical card of the present invention has a card-shaped recording layer whose optical characteristic is varied by a laser beam applied thereon, and a resin layer for protecting this recording layer. The recording layer has optical grooves provided at a substantially equal interval in the opposite end portions of the recording layer respectively and varying the light intensity of the laser beam when the beam traverses the grooves, and first and second optical markers provided at a prescribed interval in the direction of extension of each of the optical grooves and varying the light intensity of the laser beam which passes them. The optical grooves are made longer every prescribed number thereof than others, and the longer optical grooves are used for zone access, while the shorter optical grooves are used for track access in a zone. The first and second optical markers are provided at positions deviated alternately at equal distance from the center of a track, and operate as so-called wobble pits to detect a track error. These markers are used also as timing marks for generating a clock signal.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4364118 (1982-12-01), Maeda et al.
patent: 4428075 (1984-01-01), Hazel et al.
patent: 4534031 (1985-08-01), Jewer
patent: 4562564 (1985-12-01), Bricot et al.
patent: 4598393 (1986-07-01), Pierce et al.
patent: 4730293 (1988-03-01), Pierce et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
patent: 4787075 (1988-11-01), Matsuoka et al.

Affiliated with

Also associated with

Rating

Optical card having optical grooves for access and wobbled marks does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical card having optical grooves for access and wobbled marks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical card having optical grooves for access and wobbled marks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-56696