Importance

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Abstract

An optical pickup provided opposed to an optical disc D is moved in the optical axis direction with a drive signal from a focus search circuit to detect, with an amplitude detecting circuit, the character 'S' shape waveform of large amplitude corresponding to the recording surface of optical disc of the focus error signal FE obtained from the optical pickup and such detected output is counted by a counter. When the character 'S' shape waveform of large amplitude appears twice, an interval thereof is measured with a time measuring circuit and width of interval is detected with an interval detecting circuit. The counted value of counter and detected output of the interval detecting circuit are supplied to a microcomputer to automatically detect a type of optical disc. Thereby, a reproducing device which can be used for a plurality of reflection type optical discs may be structured.

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First Claim