Techniques for detecting a type of optical media and...

Details Techniques for detecting a type of optical media and... Techniques for detecting a type of optical media and...

2005-01-20

2009-02-17

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053230

Reexamination Certificate

active

07492685

ABSTRACT:
An optical disc machine initially identifies a disc positioned in it by moving the focal point of its optical pick-up unit between an outer surface and an interior reflective data carrying surface. The time required for the focal point to travel between the two reflective layers, proportional to the distance between the layers, is compared with one or more thresholds to identify the type of disc present. Example types are CDs and DVDs that can be distinguished from each other because of different distances between their two layers. Variations in the velocity of a motive source that drive the focal point to traverse the disc are compensated in order to avoid erroneous measurements of the distance between reflective layers, and thus to avoid misidentifying the disc types. Different types of DVDs or CDs may also be identified by measurement of reflected light intensity with respect to a threshold that is updateable.

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European Patent Office/International Searching Authority, “Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration,” mailed in corresponding International Application No. PCT/US2006/000599 on May 4, 2006, 12 pages.

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