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US 4,792,933 AGranted
Optical recording/reproducing apparatus having disk lifetime estimating device
AssigneePioneer Electronic Corporation
InventorTsutomu Suzuki
Life of this patent
Estimating the term…
Abstract
An optical recording/reproducing apparatus capable of accurately estimating the remaining service life of an optical disk without the need for recording large amounts of information on the disk beforehand. At the time of manufacture, the reflection factor in a specified blank portion of the disk is detected and the detected value recorded in a predetermined position on the disk. To estimate the remaining lifetime at a later time, the reflection factor is again detected and compared with the recorded value.
Claims9
An optical recording/reproducing apparatus comprising:
- a pickup for irradiating a disk to perform information recording/reproducing on said disk;
- means for driving said pickup to a predetermined position including a specified blank portion of said disk;
- a detector circuit for detecting a reflection factor at said specified blank portion of said disk;
- means for comparing a value of said reflection factor at said specified blank portion detected by said detector circuit with a value of the reflection factor at said specified blank portion recorded in advance at a predetermined position on said disk;
- and
- means for indicating a condition in accordance with a result of said comparing by said comparing means.
3 more elements
Dependencies are inferred from the claim text.