Browse Prior Art Database

Laminar Nondestructive Readout Storage Unit

IP.com Disclosure Number: IPCOM000092462D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Haskell, JW: AUTHOR

Abstract

With this storage unit, information can be written at discrete bit locations by a write head or by strong coincident write currents. A bipolar output is obtained in response to a relatively weak read pulse. Also circuits can be etched or adhered to a series of separately fabricated substrates and tested separately before assembly into a laminated sandwich.

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Laminar Nondestructive Readout Storage Unit

With this storage unit, information can be written at discrete bit locations by a write head or by strong coincident write currents. A bipolar output is obtained in response to a relatively weak read pulse. Also circuits can be etched or adhered to a series of separately fabricated substrates and tested separately before assembly into a laminated sandwich.

The unit comprises X-shaped elements 1 of soft magnetic material arranged in columns and rows on insulative substrate 2. Strips 3 of hard magnetic material are etched or adhered so as to overlie or be intimately associated with and parallel to one of the legs of each element 1. Drive lines 4 and sense lines 5 are connected by respective insulative substrates 6 and 7. Such lines are arranged in columns and rows so as to overlie each other in substantially vertical alignment with the respective crosspoints of the legs and be at 45 degrees angles to the legs. Keeper 8 of soft magnetic material also serves as a bottom ground plane.

A read pulse applied to any drive line 4 provides an output signal of positive polarity, see 10 in B, or negative polarity, see 11 in B, in the sense lines 5. This is according to whether the strips 3 over which that drive line passes have not or have been premagnetized, respectively. Such premagnetization can be accomplished by passing high write currents, e.g., about ten times the read drive current, through selected lines 4 and 5 in appropri...