| 摘要 |
For initializing and setting operation mode of devices automatically, an automatic type discrimination system of an optical disk mounted on a optical disk unit of the invention comprises: reflection measurement means (3) for measuring reflectivity (101) of back surface of the optical disk (1) provided on an opposite side of the optical disk (1) to an optical head (2); focus sum signal converting means (4) for outputting a level of a focus sum signal (102) during focus searching operation; tracking signal converting means (5) for outputting a peak to peak value of a tracking signal (103); and a microcomputer (6) for estimating material, layer number and recording density of the optical disk (1) by comparing the reflectivity (101), the level of the focus sum signal (102) and the peak to peak value of the tracking signal (103), with reference values prepared therein.
|
