Patent ID: 8427915
Filing Date: 2013-04-23
Classification: B82Y,G11B

Abstract:
1. A method for recording information as an array of optically changed portions arranged along a track in an optical storage medium, using a pulsed laser beam, the method comprising the steps of: emitting the pulsed laser beam from a pulse laser toward the optical storage medium while causing at least one of the optical storage medium and the pulsed laser beam to be moved relative to each other, wherein a plurality of pulses of the pulsed laser beam are emitted during a time span in which one segment of the track having a length corresponding to a length of one optically changed portion is scanned with the pulsed laser beam; and using a shutter to adjust an intensity of light with which a segment of the track is to be illuminated to form each individual optically changed portion, such that the density of illuminated spots in each individual optically changed portion is changed by causing the shutter to selectively reduce the number of pulses of the pulsed laser beam with which the segment of the track is to be illuminated, wherein each of the illuminated spots is formed by one pulse of the pulsed laser beam, wherein the number of pulses is reduced based on a percentage determined in accordance with a specific intensity predetermined for the segment of the track corresponding to the individual optically changed portion.