Laser positioning method and appartus for rotary actuator arms,

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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356363, 356349, G01B 902

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active

054713048

ABSTRACT:
A laser interferometer or a single aperture Laser Doppler Displacement Meter (LDDM) is used to measure the precise position of a ninety degree notch or a flat reflecting surface on a rotating arm. For the case of using the ninety degree notch, a stationary flat mirror is used to reflect back the laser beam which follows the same beam path but in the opposite direction to the receiving aperture. For the case of using a flat reflecting surface, a stationary corner cube and a stationary flat mirror are used to reflect back the laser beam which follows the same beam path but in the opposite direction all the way to the receiving aperture. For both cases, the laser beams remain aligned even though the arm rotates a large angle. Hence, the position of the rotating arm can be determined. Since the notch or flat reflecting surface is attached or integral part of the arm, the disk drive can be enclosed with the laser beam passing through a window. Hence, the technique described is non-intrusive.

REFERENCES:
patent: 3409375 (1978-11-01), Hubbard
patent: 4715706 (1987-12-01), Wang
patent: 4920442 (1990-04-01), Dimmick
patent: 5108184 (1992-04-01), Brown et al.
patent: 5315372 (1994-05-01), Tsai

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