| 摘要 |
An optical disc drive which is capable of easily and reliably recording information onto and/or playing back information recorded on various types of optical discs having different reflectances is disclosed. The optical disc drive has a rotational drive mechanism for rotating the optical disc loaded in the optical disc drive; an optical pick-up which includes an objective lens, an actuator, a laser diode and a split photodiode; an optical pick-up moving mechanism; a control means; an RF amplifier IC; a servo processor; a decoder; a memory; and a casing for housing all these elements. After moving a disc tray to the loaded position, the optical disc forces the objective lens to move in the optical axis direction to generate a focus error signal. Then, after calculating an amplitude of the generated focus error signal, the optical disc drive discriminates the presence or absence of an optical disc and the disc type of the optical disc loaded in the optical disc drive. Namely, the optical disc drive discriminates whether or not the optical disc loaded in the optical disc drive is a high-reflectance optical disc such as CD-R or a low-reflectance optical disc such as CD-RW.
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