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Optical Read Only Memory

IP.com Disclosure Number: IPCOM000097821D
Original Publication Date: 1961-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Fleisher, MD: AUTHOR [+2]

Abstract

The optical memory has a capacity of about 10/4/ records which are in the form of individual strips 15. Each is approximately. 005 thick and long enough to contain information and address data. Strips 15 are made of a transparent material and coated with an opaque layer on one edge 16. Data is recorded in a binary code arrangement by the notches 17 which effectively remove the opaque layer.

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Optical Read Only Memory

The optical memory has a capacity of about 10/4/ records which are in the form of individual strips 15. Each is approximately. 005 thick and long enough to contain information and address data. Strips 15 are made of a transparent material and coated with an opaque layer on one edge 16. Data is recorded in a binary code arrangement by the notches 17 which effectively remove the opaque layer.

When the strip 15 is mounted in the drum 18, light from the flash tube 19 is transmitted from the inner edge of the strip, through the notches 17 and onto the sensing elements 20, the presence or absence of a notch 17 indicating either a 1, or a 0.

Strips 15 are grouped in bundles of twenty to forty and separated by holders or spacers 21 which fit into slots in the periphery of drum 18. Each spacer 21 has an extending pin 22 to align and restrain a bundle. An individual spring holds each spacer 21 inwardly but it may be pulled outwardly to shift pin 22 so that a bundle of strips 15 can be inserted or removed.

Notches 17 in the strip 15 are arranged with the address portion coded on the lower end and the information section coded on the upper end. Strips 15 are mounted on the drum rim at the mid-point between the address and information sections so that the drum web forms a light barrier between the steady address light source 23 and the flashing information readout of the tube 19.

The address sections of strips 15 are continuously scanned and compared ...