| 摘要 |
The present invention relates to an information reproducing method for reproducing information recorded on an information recording carrier with several information layers by radiating light onto the carrier being e.g. an optical disc. The method comprises the step of 1) focusing the light at a first information layer or a second information layer, where the first layer and the second layer are adjacently positioned in the information recording carrier, 2) performing radial tracking on the reflected light from the information recording carrier, and 3) assessing form the radial tracking if the light is focussed on a clockwise or a counter-clockwise oriented spiral relative to the focussed light. In a particular embodiment, the assessment of whether the light is focussed on a clockwise or a counter-clockwise oriented spiral relative the light is utilized for indicating the identity of the layer on which the light is focussed. The invention also relates to an optical apparatus for implementing the method of the invention. |
