Optical recording and reading method, optical recording and reading apparatus, optical recording medium, and method for producing an optical recording medium

摘要

An optical recording medium includes a recording and reading layer that is previously staked or formed afterword and has no concavo-convex pattern for tracking control, and a servo layer in which a concavo-convex pattern or a groove for tracking control is formed. Information can be recorded in the recording and reading layer while tracking is performed using the servo layer.

主权项

1. An optical recording and reading method for recording information in a recording and reading layer in an optical recording medium, the optical recording medium comprising the recording and reading layer and a servo layer, the recording and reading layer being previously stacked or formed afterward and having no concavo-convex pattern for tracking control, the servo layer having a concavo-convex pattern or a groove for tracking control formed therein,
wherein a recording and reading beam having a second wavelength shorter than a first wavelength is applied to the recording and reading layer to record or read information while a tracking beam having the first wavelength is applied to the servo layer to perform tracking control, and wherein a reflectance of the servo layer at a time when light of the recording and reading beam having the second wavelength is applied through the recording and reading layer to the servo layer is lower than a reflectance of the servo layer at a time when light of the tracking beam having the first wavelength is applied through the recording and reading layer to the servo layer.