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Transducing Apparatus

IP.com Disclosure Number: IPCOM000095428D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Knox, LA: AUTHOR

Abstract

The magnetic transducer is for static sensing of indicia on material having high magnetic permeability. No relative movement between indicia and transducer during sensing is required.

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Transducing Apparatus

The magnetic transducer is for static sensing of indicia on material having high magnetic permeability. No relative movement between indicia and transducer during sensing is required.

The magnetic transducer has a multi-part core 1...6 the individual gaps of which are arranged to form a single common gap. Special drive winding 7 is interstitially arranged between the multi-core parts. Such places adjacent core parts at instantaneously different polarities upon energization. Thus, a balanced magnetic circuit is effected. Sense winding 8 is arranged in common encircling relationship to all of the core parts. Special sense areas 9 of a low magnetic reluctance material are arranged on a movable surface. Such pass closely adjacent to the common gap and are opposed to it.

The mutual spacing arrangements are such that certain of the core parts 1, 3 and 5 are in direct shorting relationship to the sense areas. Other of the core parts 2, 4 and 6 are disposed out of direct operative relationship to other sense areas.

In operation, drive winding 7 is supplied with an AC sinusoidal current. A relative movement is established between the transducer and the sense areas bringing the areas successively into and out of magnetic shorting relation to the different core part gaps. This causes corresponding signals to be produced by transformer action in the sense winding. Such is in the form of amplitude modulation of the AC voltage output. A clearly discernibl...