Compact optical random access memory having a refractive-reflect

Details Compact optical random access memory having a refractive-reflect Compact optical random access memory having a refractive-reflect

1999-05-14

2000-06-06

Fears, Terrell W.

Static information storage and retrieval

Information masking

365127, G11C 1304, G11C 1142

Patent

active

060727128

ABSTRACT:
A compact optical memory is disclosed in which data are stored in an optical data layer capable of selectively altering light such as by changeable transmissivity, reflectivity, polarization, and/or phase. The data are illuminated by controllable light sources and an array of multi-surface diffractive imaging lenslets which cause a data image to be projected onto an array of light sensors by reflecting, hence folding the image rays, by means of a Mangin mirror that both reflects and optically modifies the light rays to redirect them onto the sensor array located substantially coplanar with the data layer. Data are organized into an annular array of patches (called pages). By selective illumination of each data page, one of the lenslets images the selected data page onto a central image plane where the sensor array is located. Light in the data image pattern strikes different ones of the arrayed light sensors, thereby outputting a pattern of binary bits in the form of electrical data signals. By selectively and sequentially illuminating different ones of the data regions (pages) on the data layer, correspondingly different data patterns are imaged by the corresponding lenslets onto the common sensor array, thereby enabling many stored data images to be retrieved by multiplexing at electro-optical speed.

REFERENCES:
patent: 5559732 (1996-09-01), Birge

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