Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1994-01-03
1994-12-13
Young, W. R.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 4426, 369109, 369111, G11B 724
Patent
active
053735005
ABSTRACT:
The present invention concerns an arrangement for reading an optically readable carrier having a substrate with diffractive tracks with respective longitudinal axes and formed of a succession of irregularities with respect to a smooth reference surface. The irregularities have a width of at most two microns and a variable length equal to or greater than their width and these irregularities have closed contours in the reference surface. The closed contours are diffractive along the entire extent in order to provide for a diffraction of light of a particular light spot focused and centered on a single one of the tracks and substantially occupying the width of the single track. Each of the irregularities has a data element stored along the entire length of the contour and successive irregularities along a track are separated by clearance spaces at least as long as the width of the irregularities in the reference surface. Information is contained in the data elements and is indicated by the continuous extent of the closed contours and by the extent of each of the clearance basis. The irregularities with the contours are such that light emerging from the track has a spatial distribution representing an amount of track misregistration between the spot and the axis of the track. The tracks have a pitch from one track to the next of at least two times the width of an irregularity and a reflective coding is providing on the reference surface and on the irregularities.
REFERENCES:
patent: 3121216 (1964-02-01), Wolfe et al.
patent: 3198880 (1965-08-01), Toulon
patent: 3228015 (1966-01-01), Miyata
patent: 3262122 (1966-07-01), Fleisher et al.
patent: 3283310 (1966-11-01), Hughes et al.
patent: 3287563 (1966-11-01), Clunis
patent: 3328776 (1967-06-01), Hughes et al.
patent: 3381086 (1968-04-01), DeMoss et al.
patent: 3391247 (1968-07-01), Frohbach
patent: 3423698 (1969-01-01), Wilson
patent: 3430966 (1969-03-01), Gregg
patent: 3530258 (1970-09-01), Gregg et al.
patent: 3534166 (1970-10-01), Korpel
patent: 3638185 (1972-01-01), Dell et al.
patent: 3654401 (1972-04-01), Dickopp et al.
patent: 3654624 (1972-04-01), Becker et al.
patent: 3665483 (1972-05-01), Becker et al.
patent: 3687664 (1974-08-01), Broadbent
patent: 3688025 (1972-08-01), Whittemore, Jr.
patent: 3689692 (1972-09-01), Ih
patent: 3715524 (1973-02-01), Adler
patent: 3798388 (1974-03-01), Dickopp
patent: 3829622 (1974-08-01), Elliott
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3838401 (1994-09-01), Graf et al.
patent: 3855426 (1974-12-01), Bouwhuis
patent: 3956582 (1976-05-01), Bouwhuis
patent: 3999009 (1976-12-01), Bouwhuis
patent: 4041530 (1977-08-01), Kramer et al.
Electronics Review, "Philips TV disk, read by light beam could shape market", Sep. 1972.
Crovatto, "Sensing Holes and Marks", 4/71, IBM Technical Disclosure, vol. 13, No. 11.
Tolansky, "Revolution in Optics", 1968.
Hrbek, "An Experimental Optical Videodisk Playback System", Journal of the SMPTE, vol. 83, Jul. 1974, pp. 580-582.
"Thomson-CSF"
Young W. R.
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