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Electromechanical Shutter

IP.com Disclosure Number: IPCOM000093276D
Original Publication Date: 1967-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Johnson, CF: AUTHOR [+2]

Abstract

This electromechanical shutter selects different tracks of audio information in response to applied digital electrical input signals. A thin strip of metal defining a tape 10 has one end attached to stationary support 11. The other end of tape 10 is freely movable and has a series of apertures 12 in it. Tape 10 overlies a number of spaced support elements 13. Disposed in spaces 14 between elements 13 are electromagnets 15...18.

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Electromechanical Shutter

This electromechanical shutter selects different tracks of audio information in response to applied digital electrical input signals. A thin strip of metal defining a tape 10 has one end attached to stationary support 11. The other end of tape 10 is freely movable and has a series of apertures 12 in it. Tape 10 overlies a number of spaced support elements 13. Disposed in spaces 14 between elements 13 are electromagnets 15...18.

The electromagnets are positioned beneath elements 13 in such a manner that actuation of electromagnet 15 causes tape 10 to be deflected and its free end moves one unit. Electromagnet 16 causes tape 10 to be deflected and move two units. Electromagnets 17 and 18 each cause tape 10 to be deflected and move four units. Digital electrical input signals are employed to selectively actuate magnets 15...18 and move the free end of tape 10 by preselected increments to position the set of apertures 12 relative to a fixed read aperture 20.

Disposed to one side of the free end of tape 10 is a moving optical medium 21 having a plurality of tracks 22 of optical data recorded on it. The energization of the electromagnets 15...18 positions the free end of tape 10 so that a desired aperture 12 coincides with fixed aperture 20 to select one of tracks 22 for reading.

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