Actively athermalized optical head assembly

Details Actively athermalized optical head assembly Actively athermalized optical head assembly

1993-04-01

1995-01-17

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369112, 359820, 359196, G11B 700, G02B 2608

Patent

active

053831683

ABSTRACT:
An optical head assembly includes a light beam source and collimating optics mounted in an active, thermally-compensated assembly. A collimating optics mount preferably in the form of a flexure plate having a three-point elastic hinge is supported on a base plate by a respective number of equally-spaced actuators. The motion of the flexure plate is thereby over constrained and allows the operation of the elastic hinge to benefit from elastic averaging such that motion of the flexure plate may be effected by the actuators individually or in combination. Controlled flexure plate motion may be implemented to compensate for thermal shifts in system focal length, while maintaining radial and angular alignment of the collimating optics relative to the beam source, according to the influence of the individual actuators. Active control of the actuators also allows controlled movement of the collimating lens in two degrees of lateral motion (x and y motions), in addition to a piston or z motion, and tilting or tipping motions.

REFERENCES:
patent: 5101412 (1992-03-01), Pillsbury et al.
patent: 5210650 (1993-05-01), O'Brien et al.

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