Reflection measurements on optical disks
AssigneeKoninklijke Philips Electronics N.V.
InventorJohannes Leopoldus Bakx
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Abstract
The invention makes use of the air-polycarbonate interface of an optical disk as an accurate reflection reference. The air-polycarbonate interface can be used both during production of an optical disk or during normal operation of an optical disk drive. The air-polycarbonate reflection measurement can be used in a number of applications, including the process of identifying an optical disk during normal operation, detecting contamination of the optical disk during use, and testing of an optical disk during manufacture.
Claims16
A method of performing reflection measurements from a beam of light incident on an optical disk, the method comprising the steps of:
- measuring the reflection from an air to substrate interface of the optical disk;
- and
- using the reflection from the air to substrate interface as a reflection reference for other reflection measurements relating to the disk.
An optical disc drive apparatus comprising means for irradiating an incident beam of light onto an optical disk, and means for detecting light reflected from the optical disk, wherein the optical disk drive is adapted to measure the light reflected from the air to substrate interface of the optical disk;
- and adapted to control the operation of the disk drive according to the light reflected from the air to substrate interface.
An optical disk comprising a parameter indicative of the reflection coefficient of the optical disk stored therein, the parameter relating to the reflection coefficient at the interface between air and a substrate of the optical disk.
Dependencies are inferred from the claim text.