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:
Jul. 25, 1995
Filed:
Mar. 08, 1993
Fai H Mok, Torrance, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
Disclosed is a spatial multiplexer for use with a holographic storage medium, and an information storage system employing the spatial multiplexer. The spatial multiplexer directs a reference beam of optical radiation onto the storage medium, the storage medium having (n) rows and (m) columns of storage locations. The spatial multiplexer includes an array of (n times m) discrete reflector elements each having a linear shape. The discrete reflector elements are disposed in a parallel arrangement with one another upon a substrate, and each has a different angular orientation with respect to the storage medium. A deflection of the reference beam by an angle multiplexer changes the angle of incidence of the reference beam on the storage medium, which provides multiple angles required for angle multiplexing a plurality of superimposed holograms within a single storage location. A deflection of the reference beam by the spatial multiplexer specifies one of the plurality of reflectors, and thus selects one of the storage locations upon which the angle multiplexed reference beam is incident.