Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1987-08-20
1989-08-08
Faber, Alan
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369275, 369 58, 3461351, 346 76L, G11B 726, G11B 2018
Patent
active
048559849
ABSTRACT:
A digital recording medium formed of a thermoplastic substrate having rows of equally-spaced microscopic optically-alterable mirrors each supported by a mesa projecting from one surface. The medium can be formed from a single transparent thermoplastic substrate with an array of indentations in a first surface. The bottom of each indentation is coated with a reflective material. When viewed from the opposite surface of the substrate, the indentations become mesas. The mirrors serve as timing and tracking markers during pretesting, recording, and read-out. The area and location of each information bit is determined prior to recording: not as a result of the recording process. The medium is pretested for defects prior to recording by scanning with a laser beam of sufficiently low energy that the reflectivity of the storage areas is not significantly reduced. Storage areas having lower than the predetermined reflectivity are "fenced off" prior to recording. Recording is by exposure to a laser beam that reduces the reflectivity of selected mirrors. After exposure to the recording laser beam, the mirrors retain enough reflectivity to be distinguishable from the intervening valleys.
REFERENCES:
patent: 3455239 (1969-07-01), Smith
patent: 4335198 (1982-06-01), Hanada et al.
patent: 4422159 (1983-12-01), Craighead et al.
patent: 4477890 (1984-10-01), Mooney et al.
patent: 4571716 (1986-02-01), Szerlip
patent: 4616237 (1986-10-01), Pettigrew et al.
patent: 4642803 (1987-02-01), Drexler
patent: 4724444 (1988-02-01), Pettigrew et al.
Barrett E. T.
Faber Alan
Nguyen Hoa T.
LandOfFree
Method of making and pretesting a digital recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making and pretesting a digital recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making and pretesting a digital recording medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-911364