Position measuring instrument

Details Position measuring instrument Position measuring instrument

1993-02-04

1995-02-07

Wirthlin, Alvin

Geometrical instruments

Distance measuring

Scale reading position sensor

33706, 32420721, 338 32R, G01B 714

Patent

active

053866428

ABSTRACT:
A position measuring instrument for measuring the relative position of two objects movable relative to one another. The position measuring instrument comprises a periodic measurement scale division having a period t and a scanner unit, wherein the scanner unit and the periodic measurement scale division move relative to one another in a measuring direction. In addition, the scanner unit comprises four groups (A-D) each comprising at least four magnetoresistive elements (A.sub.n -D.sub.n) (n=1, 2, 3, 4, . . .), which are interconnected in the form of a series-parallel circuit to form a half bridge circuit having an upper branch and a lower branch. The upper branch comprises a magnetoresistive element from each group (A-D) and the lower branch comprises a corresponding magnetoresistive element from each group (A-D). Furthermore, the magnetoresistive elements of the upper branch are offset from the corresponding magnetoresistive elements of the lower branch by t/2. The position measurement instrument further comprises an evaluation device to form position measurement values from position-dependent output signals generated by the magnetoresistive elements in response to relative movement between the periodic measurement scale division and the scanner unit.

REFERENCES:
patent: 4346447 (1982-08-01), Takahama
patent: 4403187 (1983-09-01), Takahashi et al.
patent: 4594548 (1986-06-01), Takahashi et al.
patent: 5036276 (1991-07-01), Aizawa
patent: 5047716 (1991-09-01), Katagiri
patent: 5074929 (1991-12-01), Bradley et al.
Ernst, "Precise Positioning with Linear Encoders," Machine Design, vol. 60, No. 17, Jul. 21, 1988, pp. 77-83.

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