Patent ID: 6975572
Filing Date: 2005-12-13
Classification: G11B

Abstract:
1. A method of determining a recording velocity of a signal by a write laser beam onto an optical disc, the method comprising the steps of: undergoing a test recording of a signal onto a predetermined area of the optical disc prior to an actual recording at one or more levels of the recording velocity; reproducing the signal by a read laser beam from the predetermined area of the optical disc; generating a first characteristic at one or more levels of the recording velocity based on the reproduced signal, the first characteristic representing a relation between an optical feature of the laser beam and a qualitative parameter of a recording state of the signal, the optical feature being expressed in terms of either a β value obtained from the read laser beam reflected back from the optical disc or a power of the writing laser beam; generating a second characteristic from the first characteristic based on a predetermined preferable range of the qualitative parameter, such that the second characteristic represents a relation between the recording velocity and an available range of the optical feature corresponding to the predetermined preferable range of the qualitative parameter of the recording state; and determining a preferable value of the recording velocity according to the second characteristic and a predetermined preferable range of the optical feature which is predetermined to obtain a preferable recording state.