Centering device for the manufacture of a center hole in disks

Details Centering device for the manufacture of a center hole in disks Centering device for the manufacture of a center hole in disks

1981-03-30

1983-01-11

Rosenberger, R. A.

Optics: measuring and testing

By alignment in lateral direction

With light detector

356363, 356153, G01B 1100

Patent

active

043679528

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.

REFERENCES:
patent: 3915576 (1975-10-01), Taylor
patent: 4037969 (1977-07-01), Feldman et al.
patent: 4155098 (1979-05-01), Roach et al.
"Series G Optical Scanners", General Scanning Catalog, 1976.

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