| 摘要 |
<p>A method and an apparatus for reading information in a three-dimensional information carrier are presented. The information carrier is formed with a plurality of spaced-apart data regions, each surrounded by surrounding regions, wherein the data regions are made of a substantially fluorescent material, and the surrounding regions are made of a substantially optically transparent material with respect to a predetermined incident radiation. At least one pair of spatially separated, diffraction limited scanning beams of the incident radiation is produced. The at least one pair of beams is directed onto the information carrier and focused onto a focal plane of a light directing optics in a manner to provide their spatial separation in the focal plane and their overlap at any other location inside the carrier. The light directing optics provides a predetermined propagation of the at least one pair of beams within the carrier defined by spatial distribution of an integral intensity of the beams, so as to produce an output fluorescent radiation generated substantially by the fluorescent regions located in said focal plane.</p> |
