| 摘要 |
An optical information recording/reproducing apparatus which can prevent an optical system from being impossible to use due to its contamination, and in which an optical system need not be cleaned in case that it is not contaminated. The apparatus includes a contamination detection device for detecting contamination of an optical system of the optical information recording/reproducing apparatus. The contamination detection device includes a light source, a first detector for monitoring an output of a light beam emitted from the light source, an optical system for focusing the light beam emitted from said light source on an information recording medium, a second detector for receiving the light beam emitted from said light source and passing through said optical system and a processing device for comparing outputs from said first and second detectors.
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