Patent ID: 6510116
Filing Date: 2003-01-21
Classification: G11B

Abstract:
An optical information recording/reproducing method where length information on a mark block and a space block is used as data, the data is recorded in the form of changes of a local optical constant on a recording layer by emitting a light beam to an optical recording medium while switching an intensity of the light beam according to one or more recording pulses for the mark block, and the data is reproduced by detecting the changes of the local optical constant by a light beam with a predetermined intensity, said optical information recording/reproducing method comprising:switching a frequency characteristic of a reproducing system for detecting a change of the local optical constant to a predetermined frequency characteristic; and reproducing a test pattern recorded on the optical recording medium, and correcting at least one of a start edge position and an end edge position of the one or more recording pulses for each combination of length of the mark block and length of the space block, which is either preceding or subsequent to the mark block, so that an edge position of binarized reproducing data converges to a desired position, wherein said switching operation is performed prior to said reproducing and correcting operations.