Scanning system employing a laser beam

Details Scanning system employing a laser beam Scanning system employing a laser beam

1982-06-02

1985-02-26

Corbin, John K.

G02B 2717

Patent

active

045014671

ABSTRACT:
A scanning system using at least one mirror for scanning material to read (or alternatively to be written upon) with a laser beam is provided. Air under pressure is fed into a hollow shaft and escapes through a turbine on the shaft to rotate the shaft. The shaft is supported by air bearings. The shaft rotates the mirror during scanning. Air pressure escaping from the air bearings is vented to the ambient atmosphere. Two special thrust bearings are provided to improve the stability of the shaft. Each thrust bearing applies a force on the shaft in a direction parallel to the axis of the shaft and opposite to the force applied by the other thrust bearing. Each thrust bearing comprises a cavity in the housing, a flat plate attached to the shaft, and a porous bronze plate between the cavity and the flat plate. The air pressures in the two cavities are separately adjustable to enable the operator to select pressures that provide the system with maximum stability. The air under pressure in each cavity passes through the porous bronze plate associated with the cavity to apply pressure to the flat plate (that is attached to the shaft) associated with the cavity.

REFERENCES:
patent: 3030744 (1962-04-01), Mueller
patent: 3938191 (1976-02-01), Jarmy
patent: 4131916 (1978-12-01), Landsman
patent: 4139243 (1979-02-01), Landsman
Catalog sheet describing Fairchild Model T5100 series I/P and E/P Transducers.
Catalog sheet for M83 Seires Motor/Driver produced by Compumotor Corporation, 1310 Ross Street, Petaluma, CA 94952.
Catalog sheets for Air Bearing Slides known as Pneumo-Linear slides, manufactured by Pneumo Precision, Inc., Precision Park, Kenne, N.H. 03431.
Dover Air Bearings, Dover Instrument Corp., P.O. Box 100, 5 Walkup Drive, Westboro, Mass. 01581
Dover Bulletin #580, Dover Instrument Corp., P.O. Box 100, 5 Walkup Drive, Westboro, Mass. 01581.

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