Optical information recording and reproducing apparatus

Details Optical information recording and reproducing apparatus Optical information recording and reproducing apparatus

G - Physics

11

B

352/32.2

G11B 20/18 (2006.01) G11B 20/10 (2006.01)

Patent

CA 1301321

ABSTRACT OF THE DISCLOSURE Disclosed in an optical information recording and reproducing apparatus in which parts including a one- chip microcontroller, an error flag counter and an error comparison circuit are provided to detect whether or not an optical disk or an internal optical head of the apparatus is fouled. When the optical disk or the internal optical head is fouled due to attraction of dust floating in air, a recording laser beam is scattered by the dust resulting in reduced recording power, and a reproducing laser beam is also scattered by the dust, with the result that signal recording and reproduction cannot be satisfactorily carried out. In the optical information recording and reproducing apparatus, test data is recorded on a self-diagnostic area of the optical disk when the optical disk loaded in the apparatus is new and has not been used yet, and initial error information detected in the test data reproduced from the self- diagnostic area is registered on an error managing area of the optical disk. On the other hand, when the optical disk which has been used already is loaded, error informa- tion detected in the test data recorded on and reproduced from the self-diagnostic area of the optical disk is compared with the initial error information registered in the error managing area of the optical disk. When the result of comparison proves that the number of data errors increases over a predetermined reference value, the optical disk or the internal optical head is fouled with dust to such an extent that the recording and reproducing function cannot be satisfactorily performed.

560641

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