| 摘要 |
A marker for position detection is included in a spatially-modulated pattern of recording information, and an object light is generated and the recording information is recorded on a recording medium. From a detected light from the recording medium, information data corresponding to the recording information and marker data are detected by a two-dimensional sensor. By making unit light-receiving element sizes of marker detecting area and data detecting area of the two-dimensional sensor different, detection accuracy of the marker position can be improved. In addition, by making a bit length of the detected marker data longer than a bit length of the information data, the detection accuracy of the marker position can also be improved. Further, by outputting the detected marker data prior to the information data, a process such as a marker position detection and a geometrical correction can be started in an early stage, and reproduction of the recording information can rapidly be performed.
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