Patent ID: 7944787

Claim:
A method for adjusting a focus position for an optical disc, onto/from which information is recorded or reproduced, while adjusting the focus position of an optical reproducing means, upon a recording surface of an optical information recording medium having an area where information of said optical information recording medium is recorded in advance, comprising the following steps of: memorizing plural numbers of information relating to focus positions determined appropriately, which can be obtained from the area where the information of said optical information recording medium is recorded in advance; and adjusting the focus position for said optical disc loaded into an apparatus, from at lease one (1) signal relating to the focus position, which can be obtained from said optical disc, with utilizing a relationship between said plural numbers of information relating to the focus positions determined appropriately, memorized in advance, when reproduction of said information is impossible when the optical disc is loaded into said apparatus, wherein the plural numbers of information, which can be obtained from the area where the information is recorded in advance, includes a focus position for brining amplitude of a densest signal up to a maximum, a focus position for bringing amplitude of a sparse signal up to a maximum, and a focus position for bringing amplitude of a PID (Physical Identification Data) signal up to a maximum.