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. 17, 1984
Filed:
Oct. 20, 1980
Erik W Anthon, Santa Rosa, CA (US);
Optical Coating Laboratory, Inc., Santa Rosa, CA (US);
Abstract
Reciprocal optical system for use in an optical disc reader of the type having a laser beam and being capable of receiving optical data disc having information recorded thereon and a detector for detecting the laser beam. At least one polarizing mirror is provided and at least one converting mirror for producing a 90.degree. phase shift is provided. At least one polarizing mirror and at least one converting mirror, and the laser beam are positioned relative to the optical disc to provide from the laser beam an outgoing beam which impinges upon said at least one polarizing mirror and thereafter upon said at least one converting mirror in its travel to the optical disc and is reflected to provide a returning beam which impinges upon said at least one converting mirror and thereafter on said at least one polarizing mirror and then onto the detector. The outgoing and returning beams are orthogonally linearly polarized with respect to each other and are separated by the polarizing mirror by one beam being reflected and the other beam being transmitted by the polarizing mirror.