Apparatus and method for detecting physical orientation of a pos

Details Apparatus and method for detecting physical orientation of a pos Apparatus and method for detecting physical orientation of a pos

1992-10-13

1994-02-22

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359823, 359824, 369 4421, 369 4432, G02B 702, G11B 700

Patent

active

052893197

ABSTRACT:
A rotary positioner is rotatably mounted upon a reciprocating carriage of a optical disk drive. To detect and indicate one of a plurality of possible orientations of the disk drive, a side bias force is applied to the rotary positioner in a direction orthogonal to the radius of the disk drive. It has been found that each orientation has a side bias at which gravity effects are removed from the rotary positioner. At these points of gravity accommodation, certain instabilities in servo operation occur. Since each orientation requires a different side bias force to create the respective servo instabilities, the side bias force causing such instability indicates the drive orientation. Two modes of testing for orientation are disclosed. The carriage positioner is actuate for causing a momentary uncorrected radial movement of the carriage. The response of the carriage servo is measured in one of two ways. The uncorrected momentary carriage motion is detected either by detecting changes in a position error signal of either the rotary position or the carriage.

REFERENCES:
patent: 5038333 (1991-08-01), Chow et al.
patent: 5097361 (1992-03-01), Childers et al.

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