Record carrier with optically readable phase structure having tr

Details Record carrier with optically readable phase structure having tr Record carrier with optically readable phase structure having tr

1984-01-10

1992-12-01

Weinhardt, Robert

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692751, 369 4411, G11B 708, G11B 724

Patent

active

051684900

ABSTRACT:
A record carrier having information stored thereon in tracks comprised of areas separated from each other in the track direction by intermediate regions which are optically distinguishable from the areas. The areas in adjacent tracks have a different phase depth and are therefore also optically distinguishable from each other so that the tracks may be crowded closer together. A player is also disclosed having two detectors offset from each other in the direction of the tracks and producing signals that are alternately added and subtracted to produce a tracking signal.

REFERENCES:
patent: 3348217 (1967-10-01), Snapper
patent: 3379095 (1968-04-01), Kaprelian
patent: 3396266 (1968-08-01), Max et al.
patent: 3503050 (1970-03-01), Schools
patent: 3624278 (1971-11-01), Hecksher
patent: 3703724 (1972-11-01), Thomas
patent: 3855426 (1974-12-01), Bouwhuis
patent: 3931439 (1976-01-01), Korpel
patent: 4006293 (1977-02-01), Bouwauis et al.
patent: 4038524 (1977-07-01), Puech et al.
patent: 4041530 (1977-08-01), Kramer et al.
patent: 4057833 (1977-11-01), Braat
patent: 4065786 (1977-12-01), Stewart
patent: 4084185 (1978-04-01), de Lang et al.
patent: 4085423 (1978-04-01), Tsunoda
patent: 4161752 (1979-07-01), Basilico
patent: 4209804 (1980-06-01), Dil
patent: 4385372 (1983-05-01), Drexler
patent: 4455632 (1984-06-01), Braat
patent: 4556967 (1985-12-01), Braat
Sheng, P., "Theoretical Considerations of Optical Diffraction from RCA Videodisc Signals", RCA Review, vol. 39, Sep. 1978, pp. 512-555.
Dil et al., Journal of the Optical Society of America, vol. 69, No. 7, Sep. 1979, pp. 950-956 and 958-960.

Affiliated with

Also associated with

Rating

Record carrier with optically readable phase structure having tr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Record carrier with optically readable phase structure having tr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Record carrier with optically readable phase structure having tr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-507504