Browse Prior Art Database

Light Operated Read Only Store

IP.com Disclosure Number: IPCOM000095175D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Hobbis, AJ: AUTHOR [+2]

Abstract

A read-only store comprises block 1 of semiconductive material having a matrix of integral photosensitive diodes on one surface.

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Light Operated Read Only Store

A read-only store comprises block 1 of semiconductive material having a matrix of integral photosensitive diodes on one surface.

Block 1 forms a common terminal for all the diodes. The other terminals are connected together in columns by lines 2... 9. Each light source 10... 17 directs light, through a light guide, to an associated row of the diodes.

A particular diode is selected by the application of both an electrical pulse to its column line and a light pulse to its row to provide an output signal at terminal
18. The binary significance of data stored at each location can be determined by either placing a mask between the light guides and the diodes so that only selected diodes receive light pulses or by disconnecting selected diodes from their column lines.

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