Coaxial disc-mount for measuring flatness of computer-drive discs by interferometry
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United States of America Patent
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Nov 18, 1997
Grant Date -
N/A
app pub date -
Aug 15, 1996
filing date -
Aug 15, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An interferometer mounting mechanism that consists of a horizontal shaft rigidly connected to the interferometer in axial alignment with the optical path of the instrument and protruding through an opening in the center of the transmission flat. A sample stage adapted to receive a computer-drive disk is attached to the distal end of the shaft, so that the stage is directly and rigidly connected to the interferometer. The sample stage consists of a hub capable of retaining a disk in precise alignment with the transmission flat by hanging its center hole on two support posts and resting the disk on three pressure tips on the hub. A system of push-pull adjustment screws is provided to set the proper tip/tilt of the disk.
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