Telecentric rotary actuator in an optical recording system

Details Telecentric rotary actuator in an optical recording system Telecentric rotary actuator in an optical recording system

1993-03-08

1995-06-06

Epps, Georgia Y.

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Continuous consecutive storage or retrieval of interrupted...

369 4418, 369 4428, 369 4423, 369119, G11B 374

Patent

active

054228727

ABSTRACT:
A telecentric rotary actuary in an optical storage system. A laser generates a laser beam which is focused by an objective lens onto an optical disk in order to write data to and read data from the optical disk. In performing a seek, a galvo rotates a mirror in order to reflect the laser beam to different radial displacements in reference to the optical disk. The position of the laser beam is detected, and a rotary actuator, to which the objective lens is attached, follows the movement of the laser beam. A telecentric optical system comprising a relay lens and an image lens is used to minimize an offset between the laser beam and the objective lens. The relay lens focuses the laser beam to a back focal point. The image lens optically conjugates the back focal point to a front focal point corresponding to the objective lens in order to demagnify any offset.

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