Optical disc and discarding method thereof
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United States of America Patent
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Issued Date -
Dec 29, 2005
app pub date -
Jun 23, 2005
filing date -
Jun 25, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A substrate 12 consists of a transparent plastic made from polylactic acid as a material, and an optical disc 10 provided with the substrate 12 is heated up to a heat deflection temperature. As a result, the substrate 12 is softened, and pits 22 formed on a signal recording surface 20 of the substrate 12 are erased. Thus, data recorded on the optical disc 10 is unreadable, and even if the disc 10 is discarded, the optical disc 10 is never read carelessly in accordance with the disposal of the optical disc.
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