Browse Prior Art Database

Scanning Comparator

IP.com Disclosure Number: IPCOM000080331D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Culver, JV: AUTHOR [+5]

Abstract

The drawing shows a scanning apparatus for testing bit plates 2 of capacitor read-only memories, by comparing their bit positions with corresponding positions of bit plates 3 that are known to be good. The plates 2 and 3 are flexible and are mounted on opposite surfaces of a rotatable cylindrical support 4. Two optical sensors 5, 6 are mounted on a fork member 7 that is vertically movable, to carry the sensors past the bit plates as the support is rotated.

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Scanning Comparator

The drawing shows a scanning apparatus for testing bit plates 2 of capacitor read-only memories, by comparing their bit positions with corresponding positions of bit plates 3 that are known to be good. The plates 2 and 3 are flexible and are mounted on opposite surfaces of a rotatable cylindrical support 4. Two optical sensors 5, 6 are mounted on a fork member 7 that is vertically movable, to carry the sensors past the bit plates as the support is rotated.

The sample 8 of the bit pattern, illustrates that the metal capacitor plates are optically distinguishable from the dielectric on which the plates are supported. A noncomparison of the signals for a predetermined time duration, signifies that the plates have been improperly etched or are otherwise defective. A track 9 signals the location of the angular location of support 4 when an error is found.

For faster operation in which centrifugal force might loosen the outer bit plates, the apparatus can readily be adapted to helically scan subjects mounted on only the inner surface of support 4 with sensors 5, 6 spaced apart to scan corresponding locations of plates 2 and 3. The apparatus can similarly be adapted to spirally scan subjects mounted on a flat rotatable disk.

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