Optical head and read/write drive including the optical head

Details Optical head and read/write drive including the optical head Optical head and read/write drive including the optical head

2007-10-09

2007-10-09

Patel, Gautam R. (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S094000

Reexamination Certificate

active

10834710

ABSTRACT:
A drive reads and/or writes data from/on an optical data storage medium, including first and second data storage layers stacked in this order toward the depth thereof, by radiating light through the surface. The drive includes a light source, a lens, a light detector, and a layer sensor. The light source emits the light. The lens produces a focal spot. The light detector includes at least one photodetector for receiving the light and generating a light quantity signal. The photodetector is used as a layer-sensing photodetector not receiving the light from the second data storage layer when the focal spot is located on the first data storage layer and receiving the light from the first data storage layer when the focal spot is located on the second data storage layer. The layer sensor determines, by the light quantity signal, where the focal spot is now located.

REFERENCES:
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patent: 6438088 (2002-08-01), Sugiyama et al.
patent: 7054240 (2006-05-01), Song et al.
patent: 7130250 (2006-10-01), Fujiune et al.
patent: 09-259456 (1997-10-01), None

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