| 摘要 |
A disk is detected as being loaded on a clamper in a dual purpose laser disk player and the disk is then determined to be either a compact disk or a laser disk. A disk sensor detects a loaded disk and a pickup unit, having both a pickup and tilt sensor mounted thereon, is moved radially inward to be adjacent a compact disk recognition switch. The pickup is then operated in order to attempt to achieve focus lock. Once focus lock is obtained the disk is determined to be a compact disk and the disk player is operated as a compact disk player. If focus lock is not obtained the pickup unit is moved radially outward while a tilt sensor provides light to the disk. A laser disk discriminating circuit detects the light reflected from the disk and compares the reflected light's level to a reference value. The comparison result is provided to a microprocessor, via a buffer, and the microprocessor determines whether or not the light is being reflected from a data are of the disk. When the microprocessor determines the light is not reflected from the data area of the disk the microprocessor determines the disk to be a laser disk, stops the movement of the pickup unit, obtains focus lock and operates the disk player as a laser disk player.
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