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Bit Viewer Arresting Means

IP.com Disclosure Number: IPCOM000097744D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Mathisen, ES: AUTHOR

Abstract

This device permits the viewing of digital bits recorded on magnetic tape. It also permits arresting the bit pattern to allow movement of the device without distorting the pattern.

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Bit Viewer Arresting Means

This device permits the viewing of digital bits recorded on magnetic tape. It also permits arresting the bit pattern to allow movement of the device without distorting the pattern.

Tiny magnetic iron-oxide particles of the type used in magnetic tape are suspended in a transparent fluid 15 in the space between diaphragm 10 and bottom 11 of a cylindrical container 12. Diaphragm 10 is supported around its circular edge by a flexible member 13 of Ushaped cross-section. When a recorded tape surface is placed against the outside surface of bottom 11, the recorded pattern is formed by tiny oxide particles pulled out of suspension in the fluid.

Air is admitted through valve 20 into an upper chamber 14 between diaphragm 10 and the top 16 of container 12. The pressure of the air causes diaphragm 10 to move downwardly against the pattern. The fluid is forced out from under diaphragm 10 into U-shaped circular member 13. Since member 13 is flexible, it is capable of expanding, if necessary, to hold the fluid. Since only a small gap is initially provided between diaphragm 10 and bottom 11, the total volume of fluid moved is small and the rate of movement is sufficiently slow so that the pattern is not disturbed.

When it is desired to destroy the magnetic pattern, air is removed from chamber 14 and diaphragm 10 moves upwardly. Hence the fluid moves back under diaphragm 10. The fluid is shaken to destroy the pattern and thereafter a new pattern is form...