Opto-electronic memory systems
First Claim
1. An opto-electronic memory system comprising a memory element in which data is stored in rows of optically readable memory locations, electro-optical reading means for reading the rows of memory locations and comprising an array of light photosensitive elements, characterised in that data is stored at memory locations of the memory element as a colour with different data being represented by respective different colours and in that the reading means includes means for addressing the memory locations sequentially with reading light of different colours.
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Abstract
In an opto-electronic memory system having a memory element (14), for example an optical data card, in which optically-encoded data is stored in rows of memory locations (17) and reading elements (10,12) comprising a photosensitive element array (12) and operable to read out stored data in response to illumination of the memory locations, data is stored at memory locations as colors representing different data values and the memory locations are addressed with reading light of different colors in sequence, thereby enabling higher data storage capacities to be obtained. The memory locations may be reflective or transmissive. The reading elements may comprise linear or two dimensional arrays of photosensitive elements.
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Citations
15 Claims
- 1. An opto-electronic memory system comprising a memory element in which data is stored in rows of optically readable memory locations, electro-optical reading means for reading the rows of memory locations and comprising an array of light photosensitive elements, characterised in that data is stored at memory locations of the memory element as a colour with different data being represented by respective different colours and in that the reading means includes means for addressing the memory locations sequentially with reading light of different colours.
Specification