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:
Sep. 06, 1983
Filed:
Nov. 16, 1981
Johannes T van de Veerdonk, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A swing-arm device (5) for an optical disk player comprises a swing arm (16), which near one end (17) carries an optical scanning unit (6) and which is electromagnetically pivoted by means of coils (27, 28) and a permanent magnetic stator (29, 30, 49-52, 54) arranged on the swing arm. The center of mass (Z) of the pivotal assembly, inter alia comprising the swing arm and the optical scanning unit, is disposed on the pivotal axis and the two coils are disposed diametrically on both sides of the pivotal axis and exert equal pivotal forces which act in one plane which is perpendicular to the pivotal axis and which extends through the center of mass. The center of mass is disposed midway between two ball-bearings (20, 21).