Patent ID: 7016282

Claim:
An information recording method for recording information on an optical disk having a recording layer of phase changing type, in a variable linear velocity so as to correspond the information to an edge of a record mark to be formed when an optical pulse is irradiated on said optical disk, wherein, when a window width at a first linear velocity v 1 is nTw (where n is an integer), the window width at a second linear velocity v 2 faster than the first linear velocity v 1 is mTw (where m is an integer), a pulse width of the optical pulse to be irradiated when forming the record mark at said first linear velocity v 1 is P1, the pulse width of the optical pulse to be irradiated when forming the same record mark as in said first linear velocity v 1 , at said second linear velocity v 2 , is P2, such that P1<P2 is satisfied, wherein the window width is an inverse number of a clock frequency at one of the first linear velocity and the second linear velocity, and wherein for a record mark of a first length, (P2/mTw)−(P1/nTw) equals a first value, and for a record mark of a second length which is shorter than the first length, (P2/mTw)−(P1/nTw) has a second value which is greater than the first value.