Optical recording/reproduction device and focal point...

Details Optical recording/reproduction device and focal point... Optical recording/reproduction device and focal point...

2006-04-18

2006-04-18

Klimowicz, William (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053230, C369S053280

Reexamination Certificate

active

07031233

ABSTRACT:
An optical recording/playback apparatus of the present invention achieves proper focus control on a target recording layer of a single-layer disk or a multilayer disk. When the focus control is performed on the target information-recording layer of a recording medium, spherical-aberration compensation is first adjusted with respect to the thickness of a transmissive protection layer (cover layer) for the target information-recording layer. Alternatively, the adjustment may be made with respect to the average thickness of transmissive protection layers for the corresponding multiple information-recording layers. An objective lens is then moved along the optical axis to perform a focus-searching operation. In that case, the polarity of a focusing error signal and the level of a reflected-beam intensity signal generated as reflected-beam information are observed so as to perform the focusing operation.

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