Read-only optical memory system

Abstract

An improved read-only optical memory system is provided comprising a mask ving a plurality of discrete increments of recorded information defined by variations in opacity and a suitable light source positioned to illuminate the mask so that the mask transmits recorded information in the form of light energy in accordance with the opacity of the illuminated discrete increments. A multiple element photo responsive charge coupled device is positioned to receive the light energy transmitted by the illuminated mask and has its elements arrayed for developing a charge at each element position commensurate with the photo energy transmitted by an optically aligned discrete increment of the mask. Accordingly, the charges of the multiple elements are representative of the recorded information defined by variations in opacity of the mask and means for transferring the charges out of the charge coupled device is provided such as appropriate control logic and/or clocking pulses producing electrical signals from the individual discrete charges of each element in the charge coupled device which are representative of the recorded information. The mask is adapted to be replaceable providing access to as much additional recorded information as may be desired.