Magnetic circuit, optical pickup actuator, optical recording...

Details Magnetic circuit, optical pickup actuator, optical recording... Magnetic circuit, optical pickup actuator, optical recording...

2005-01-27

2009-12-08

Wellington, Andrea L (Department: 2627)

Dynamic optical information storage or retrieval

Dynamic mechanism optical subsystem

Transducer carriage or actuator

C720S681000, C720S672000

Reexamination Certificate

active

07631322

ABSTRACT:
A magnetic circuit, an optical pickup actuator, an optical recording and/or reproducing apparatus using the magnetic circuit, and method of the same, wherein the magnetic circuit includes a plurality of focus coil units each of which includes a first focus coil and a second focus coil, and a magnet including a plurality of magnet portions which interact with the plurality of focus coil units and each of which is polarized in a direction opposite to adjacent magnet portions thereamong. Here, electromagnetic forces act on the first and second focus coils in each focus coil unit in a same direction in response to focus driving signals and in opposite directions in response to tilt driving signals, with the first and second focus coils in each focus coil unit have different effective coil lengths.

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Japanese Office Action Issued Jul. 11, 2006 in Related Japanese Application No. 2005-20358.
European Patent Search Report dated Nov. 3, 2006 and issued in correspondence to International Application No. 05250431.3-2210.

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