Objective lens drive unit having shaped magnetic pieces for prov

Details Objective lens drive unit having shaped magnetic pieces for prov Objective lens drive unit having shaped magnetic pieces for prov

1994-10-13

1997-08-19

Tupper, Robert S.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369219, 359814, 359824, G02B 702, G11B 2110

Patent

active

056595255

ABSTRACT:
An objective lens drive device includes an objective lens holder, a fixing member, drive coils mounted on one of the objective lens holder and the fixing member; magnets mounted on the other, the magnets positioned in a face-to-face relationship with the drive coils and supplied with an electric current so as to drive the lens holder in both a focusing and a tracking direction, the magnets are magnetized with polarization at least in the focusing direction; and magnetic pieces placed in the magnetic circuits of the magnets relating to a focusing direction, wherein a two-dimensional restoring force is generated in the focusing and tracking directions by the magnetic attraction acting on the magnetic pieces so that the objective lens is held at the neutral point, at least one end portion of the magnetic pieces in the polarizing direction is wider than the middle portion.

REFERENCES:
patent: 4790628 (1988-12-01), Nanno et al.
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5073882 (1991-12-01), Sasaki
patent: 5191484 (1993-03-01), Yeon et al.

Affiliated with

Also associated with

Rating

Objective lens drive unit having shaped magnetic pieces for prov does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Objective lens drive unit having shaped magnetic pieces for prov, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Objective lens drive unit having shaped magnetic pieces for prov will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1109998