The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 1993
Filed:
Sep. 19, 1990
Johannes M Hensing, Eindhoven, NL;
Cornelius A Hezemans, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A device for inscribing and or reading a magneto-optical disc includes a turntable mounted for rotation about an axis of rotation, and an optical unit and a magnetic unit movably mounted opposite to and spaced from each other in a direction parallel to the axis of rotation. The optical unit and magnetic unit are mounted each to be movable in a plane transverse to the rotation axis. The magnetic unit includes a coil on a support which in turn is movably mounted on a displacement body which is radially moveable with respect to the axis. During operation a measurement and control system determines the radial position of the optical unit and the magnetic unit relative to each other in the radial direction, for controlling at least the radial position of the coil of the magnetic unit relative to an objective of the optical units.