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:
Apr. 02, 1996
Filed:
Mar. 06, 1992
Quantum Corporation, Milpitas, CA (US);
Abstract
A remote fine positioning mechanism of an optical storage device includes a stationary galvanometer-controlled mirror (galvo mirror) and an imaging lens, the imaging lens positioned to provide an image of the galvo mirror at the front focal point of an objective lens mounted to an optical head assembly. The galvo mirror functions as a beam steering element that is rotated about a steering axis to change the angle of incidence of a collimated laser beam with respect to the objective lens during track selection operations. Thus, for rotation of the galvo mirror to change the direction of the laser beam, the system operates as though the mirror were physically located at that focal point. To perform the imaging function, the imaging lens decollimates the beam. A collimation-correction lens is therefore provided to ensure, in combination with the imaging lens, that the laser beam remains collimated when it reaches the objective lens.