Browse Prior Art Database

Improved Optical Disk Fine Actuator

IP.com Disclosure Number: IPCOM000100706D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 85K

Publishing Venue

IBM

Related People

Wenner, JW: AUTHOR

Abstract

In general, a fine actuator for an optical disk 1, provides objective lens 2, with motion in two axes 3 and 4; perpendicular to the disk surface, the Y direction 3, for focus and parallel to the disk surface, the X direction 4, for tracking. Incident light beam 5, is focused by objective lens 2, on the track 6. See Fig. 1.

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Improved Optical Disk Fine Actuator

       In general, a fine actuator for an optical disk 1,
provides objective lens 2, with motion in two axes 3 and 4;
perpendicular to the disk surface, the Y direction 3, for focus and
parallel to the disk surface, the X direction 4, for tracking.
Incident light beam 5, is focused by objective lens 2, on the track
6.  See Fig. 1.

      The improved optical disk fine actuator is shown in Fig. 2,
including the objective lens 2, and the objective lens collar
assembly 7.  Referring to Fig. 3, the complete magnet, collar, and
objective lens assembly 10 includes two magnets 8 attached, one to
each side, to the objective lens collar assembly 7.  The magnetic
field 9 from these magnets, is oriented in series aiding.

      The complete coil assembly 14 is shown in Fig. 4.  A focus coil
11, is wound on a shield of high permeability magnetic material 12.
A tracking coil 13, is wound at 90o over the focus coil 11.  A pair
of coil assemblies 14 is placed adjacent to the magnet, collar,
objective lens assembly 10, as shown in Fig. 5.

      The magnet, collar, objective lens assembly 10, is supported in
space and attached by four members wrapped approximately 2o; these
members are of equal tension and unsupported length and firmly
attached at the ends 15.  They are operated in the linear portion of
the stress/ strain curve by the magnetic field 9, from the magnets 8,
which interact with the pair of coil assemblies 14, that are...