Optical information recording medium and method of fabricating t

Details Optical information recording medium and method of fabricating t Optical information recording medium and method of fabricating t

1989-03-02

1991-08-13

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369116, 369 4426, 369 4437, 369278, G11B 724

Patent

active

050401653

ABSTRACT:
An optical information recording medium in which pre-pits longer than the diameter of a reproducing radiation spot and pre-pits shorter than the diameter of the reproducing radiation spot coexist, the width W of the pre-pit longer than the diameter of the reproducing radiation spot being formed with a value satisfying a relation of .PHI./4<W<.PHI./3, wherein .PHI. is the diameter of the reproducing radiation spot and a method of fabricating the optical information recording medium comprising setting a power of a radiation beam when a pre-pit shorter than the diameter of the reproducing radiation spot among a plurality of pre-pits to be formed for each sector is cut to a predetermined optimum value, setting a power of the radiation beam when the pre-pit longer than the diameter of the reproducing radiation spot is cut to a predetermined value smaller than the predetermined optimum value of the radiation beam power when the pre-pit shorter than the diameter of the reproducing radiation spot is cut, and performing the cutting of pre-pits while combining the radiation beam power at the predetermined optimum value when the pre-pit shorter than the diameter of the reproducing radiation spot is cut with the radiation beam power at the predetermined smaller value when the pre-pit longer than the diameter of the reproducing radiation spot is cut.

REFERENCES:
patent: 4118734 (1978-10-01), Bauwhuis et al.
patent: 4744074 (1988-05-01), Imanak et al.
patent: 4896313 (1990-01-01), Hirose et al.
"Technological Colligation for Optical Colligation", Science Forum K. K., Oct. 31, 1983; pp. 29-30 entitled "Synthetic Collection of Optical Memory and Opto-Magnetic Memory Technologies".

Affiliated with

Also associated with

Rating

Optical information recording medium and method of fabricating t 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 information recording medium and method of fabricating t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical information recording medium and method of fabricating t will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1532491