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:
Oct. 13, 1992
Filed:
Jul. 30, 1991
Steven L Grove, Colorado Springs, CO (US);
Curtis A Shuman, Colorado Springs, CO (US);
Applied Magnetics Corporation, Goleta, CA (US);
Abstract
A multi-element, air-spaced prism system for use in a reflective-type optical media device having a light source to provide an incident light beam provides an achromatic, anamorphic prism which corrects for astigmatism and ellipticity in the light beam from the light source. One embodiment of the prism system provides at least two reflections of a return beam from the reflective-type optical media. The return prism provides these reflections from various optical surfaces in the multi-element prism system. In one embodiment, the prism system also provides a reflection of a portion of the incident beam. This reflection is directed to a detector which can, for instance, monitor the intensity of the light beam.