Patent ID: 6278672
Filing Date: 2001-08-21
Classification: G11B

Abstract:
An optical disc discriminating device for discriminating a type of reflection-type optical disc by reading a light beam reflected from the optical disc with an optical pickup, comprising:moving means for moving a focus position of a light emitted from said optical pickup in an optical axis directed within a predetermined range;means for generating a focus error signal based on the movement of the focus position;amplitude detecting means for detecting if an amplitude of the focus error signal generated by said generating means has exceeded a predetermined threshold value;counting means for counting a number of outputs from said amplitude detecting means;time interval measuring means for measuring a time interval of an output of said amplitude detecting means; andinterval detecting means for detecting a result of a comparison between the time interval measured by said time measuring means and a predetermined reference time;whereby the type of reflection-type optical disc can be discriminated on the basis of an output of said interval detecting means and said counting means.