Disc device

Details Disc device Disc device

2008-03-25

2010-02-09

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044270

Reexamination Certificate

active

07660223

ABSTRACT:
A disc device includes a lens that focuses a laser light on an optical disc surface, a focus drive unit that drives the lens in a focusing direction, a focus control unit that controls to focus the laser light on the optical disc surface, a focus displacement detecting unit that detects a displaced amount in the focusing direction, a differentiation unit that differentiates a focus displacement detected signal, and a unit that inverts a sign of a differentiated signal, thereby, the disc device is driven intermittently to restrain a motion of an objective lens in a focusing direction and avoid colliding the objective lens with the optical disc surface.

REFERENCES:
patent: 5745450 (1998-04-01), Miyazono
patent: 2000-222744 (2000-08-01), None
patent: 2006-338783 (2006-12-01), None

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