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:
Feb. 11, 1986
Filed:
Feb. 22, 1983
Roland Malissin, Paris, FR;
Claude Monlouis, Paris, FR;
Thomson CSF, Paris, FR;
Abstract
An optical head is provided for writing and reading a disk by means of at least one focused beam, the disk being provided with at least one track having uniformly spaced grooves. The optical head makes use of a motor comprising a fixed magnetic circuit provided with at least one air-gap in which a moving system is capable of displacement and is also provided with an access and radial tracking magnetic circuit including at least one core which is secant with all the grooves. The moving system is constituted by two actuators, the first actuator being intended to permit access and radial tracking while the second actuator permits focusing of the light beam on the track, the two actuators being coupled by flexible attachment means. Guiding means comprising magnetic elements permit lifting of the access and radial tracking actuator with respect to the core of its magnetic circuit.