Centering device for the manufacture of a center hole in disks
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United States of America Patent
Stats
-
Jan 11, 1983
Grant Date -
N/A
app pub date -
Mar 30, 1981
filing date -
Mar 30, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A centering device for the manufacture of a center hole in disks, particularly metallized video disks with spiral information tracks and an information-free center, employs a measuring head for the emission of a light beam onto the disk surface. The light beam is precisely situated at a boundary between the information portion and the information-free portion of the disk during a full disk revolution (a transition criterion) and that said criterion is evaluated for the identification of the center. An electronic control circuit is provided for the control of the displacements required for the measuring head and of the disk centered in planes which are parallel relative to one another.
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