| CPC G11B 7/00375 (2013.01) [G01N 21/9506 (2013.01); G11B 7/127 (2013.01); G11B 2007/0006 (2013.01)] | 3 Claims |
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1. An optical disc device that records or reproduces information on or from an optical disc by irradiating the optical disc with laser light, the optical disc device comprising:
an optical pickup including:
a laser light source that emits the laser light,
an objective lens that focuses the laser light emitted from the laser light source onto the optical disc, and
a light receiving element that receives reflected light from the optical disc, and performs photoelectric conversion on the reflected light received to generate a received-light signal, amplifies the received-light signal to an amplified received-light signal at a predetermined amplification factor, and outputs the amplified received-light signal;
a light amount signal generator that generates a light amount signal indicating a light amount of the reflected light from the optical disc, based on the amplified received-light signal from the light receiving element; and
a dirt determiner that determines that dirt is present in the optical pickup, when a peak level of the light amount signal is less than a first threshold, and controls the light receiving element to increase a peak level of the amplified received-light signal by increasing the predetermined amplification factor.
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