Patent ID: 7006425
Filing Date: 2006-02-28
Classification: G11B

Abstract:
1. An information recording method for recording information into an optical recording medium, said information being reproduced by irradiating a light beam for reproducing through a lens, changing a position of a beam-waist of the light beam both in depth and planar directions of said optical recording medium, and detecting an intensity pattern of said light beam for reproducing which has passed through said optical recording medium, said method comprising: forming at least two marks of a plurality of marks, said at least two marks having different depths within a depth range of the optical recording medium such that said light beam for reproducing is capable of reproducing information of each of the at least two marks while maintaining a same distance between said lens and said optical recording medium; and forming a third mark of said plurality of marks in said depth range so that said light beam for reproducing is capable of reproducing information of each of said at least two marks and said third mark while maintaining said same distance between said lens and said optical recording medium, and said plurality of marks are formed to describe a continuous predetermined three-dimensional track or locus.