Optimized laser read power based upon scan speed of optical medi

Details Optimized laser read power based upon scan speed of optical medi Optimized laser read power based upon scan speed of optical medi

1995-05-22

1996-12-17

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 32, G11B 700

Patent

active

055860990

ABSTRACT:
A laser read beam power level is increased with increasing radii and decreased with decreasing radii of scanning a spiral track in an optical disk. The change of read beam power level is adjusted in accordance with an established erasure profile. The erasure profile indicates beam power level at various radii at which recorded data are erased, such as in a magneto-optical disk. Read beam power level is adjusted from a pre-established minimum read beam power level (used at an inner disk radius) following the erasure profile. This action maximizes read power level without exceeding the erasure profile indicated power levels. Radial ranges are established for reading from the optical disk. Within each range, the laser beam read power level is kept constant, preferably at the desired power level at an radially inner-most portion of the respective range. Optical disks have the minimum laser read beam power level and an erasure profile recorded therein.

REFERENCES:
patent: 4334301 (1982-06-01), Kanamaru
patent: 4685097 (1987-08-01), van der Put
patent: 4763134 (1988-08-01), Murahashi et al.
patent: 4813034 (1989-03-01), Mashimo
patent: 4908815 (1990-03-01), Gregg et al.
patent: 4937809 (1990-06-01), Miyadera et al.
patent: 4949329 (1990-08-01), Forman et al.
patent: 5134606 (1992-07-01), Sekiguchie et al.
patent: 5185733 (1993-02-01), Finkelstein et al.
patent: 5276670 (1994-01-01), Nogami et al.
patent: 5303222 (1994-04-01), Matsueda
patent: 5315402 (1994-05-01), Ito et al.
patent: 5392273 (1995-02-01), Masaki et al.
patent: 5467337 (1995-11-01), Matsumoto

Affiliated with

Also associated with

Rating

Optimized laser read power based upon scan speed of optical medi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optimized laser read power based upon scan speed of optical medi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimized laser read power based upon scan speed of optical medi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1997777