Objective lens actuator and a disc apparatus applying the...

Details Objective lens actuator and a disc apparatus applying the... Objective lens actuator and a disc apparatus applying the...

2009-08-13

2011-10-25

Psitos, Aristotelis (Department: 2627)

Dynamic optical information storage or retrieval

Dynamic mechanism optical subsystem

Transducer carriage or actuator

C369S112230

Reexamination Certificate

active

08046785

ABSTRACT:
An objective lens actuator comprises a lens holder for attaching an objective lens thereon, a piece of focusing coil, being wound along side surface of the lens holder around the objective lens, and three magnets, being disposed opposing to two surfaces each having a normal line perpendicular to both a focusing direction and a tracking direction, among four side surfaces of the lens holder, wherein the three magnets are aligned, continuously, along the tracking direction, differing a polarity thereof from one another, and width of the magnets on both outsides is wider than width of the magnet inside, or alternately, one magnet, being disposed opposing to two surfaces each having a normal line perpendicular to both a focusing direction and a tracking direction, among four side surfaces of the lens holder, wherein the magnet is magnetized into three poles along the tracking direction, and among the three poles, width of the poles on both outsides is wider than width of the pole inside.

REFERENCES:
patent: 2005/0013213 (2005-01-01), Fujita
patent: 2007/0147197 (2007-06-01), Huang et al.
patent: 2010/0067353 (2010-03-01), Ochi
patent: 101676759 (2010-03-01), None
patent: 11-191228 (1999-07-01), None
patent: 2002-358675 (2002-12-01), None
patent: 2005-038496 (2005-02-01), None
patent: 2005-310237 (2005-11-01), None
patent: 2006-004485 (2006-01-01), None
patent: 2010-73225 (2010-04-01), None

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