Magnetic position detector for detecting an absolute position of

Details Magnetic position detector for detecting an absolute position of Magnetic position detector for detecting an absolute position of

1986-08-14

1988-08-23

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

338 32R, G01B 730

Patent

active

047663766

ABSTRACT:
A magnetic recording medium is provided on a rotary drum and is divided into a plurality of magnetic tracks. On each track is recorded a magnetic signal of a combination of a magnetization portion which consists of two consecutive unit magnets (pitch .lambda.) and a no-magnetization portion having the same length (2.lambda.) that are alternatingly arranged over the whole periphery of the track. First magnetoresistive elements in the magnetic sensor are arranged in pairs so as to be opposed to the magnetic tracks maintaining a distance of .lambda./2. Second magnetoresistive elements opposed to the magnetic track that correponds to the lowest-order bit of position detecting signals, are arranged in a number of ##EQU1## for the first magnetoresistive element maintaining a distance of ##EQU2## wherein SM.sub.L denotes the length of the magnetic signal of the magnetic track, m denotes the number of the increased bits (0<m.ltoreq.2), and n denotes an integer (0.ltoreq.n<2). Thus, detecting signals are obtained in a bit number in excess of the number of the magnetic tracks.

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