Laser optical disk position encoder with active heads

Details Laser optical disk position encoder with active heads Laser optical disk position encoder with active heads

1990-03-30

1992-04-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

369 4426, G01D 534

Patent

active

051071070

ABSTRACT:
An angular position encoder is provided that minimizes the effects of eccentricity and other misalignments between the disk and the read stations by employing heads which incorporate beam steering optics with the ability to actively track the disk in directions along the disk radius and normal to its surface. The device adapts features prevalent in optical disk technology toward the application of angular position sensing. A reflective disk and the principles of interferometry are employed. The servo controlled steering optics move so as to acquire a track on the disk lying at a predetermined radius and distance below the head, and then adjust position and orientation in order to maintain view of the disk track as required. Thus, the device is actively self-aligning.

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Applicant Eric P. Osborne, "A Theoretical Comparison: Rotary Encoders with Fixed Read Stations & Those with Moving Heads," a Master's Thesis Submitted to the University of Maryland School of Mechanical Engineering in Apr. 1989.

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