Electronic caliper using a reduced offset induced current positi

Details Electronic caliper using a reduced offset induced current positi Electronic caliper using a reduced offset induced current positi

1997-11-21

1999-05-11

Bennett, G. Bradley

Geometrical instruments

Distance measuring

Opposed contacts

33784, 33708, 32420724, G01B7/02

Patent

active

059014580

ABSTRACT:
An electronic caliper having a reduced offset position transducer that uses two sets of coupling loops on a scale to inductively couple a transmitter winding on a read head on a slide to one or more receiver windings on the read head. The transmitter winding generates a primary magnetic field. The transmitter winding is inductively coupled to first loop portions of first and second sets of coupling loops by a magnetic field. Second loop portions of the first and second sets of coupling loops are interleaved and generate secondary magnetic fields. A receiver winding is formed in a periodic pattern of alternating polarity loops and is inductively coupled to the second loop portions of the first and second sets of coupling loops by the secondary magnetic fields. Depending on the relative position between the read head and the scale, each polarity loop of the receiver winding is inductively coupled to a second loop portion of either the first or second set of coupling loops. The relative positions of the first and second loop portions of the first and second sets of coupling loops are periodic and dependent on the relative position of the coupling loops on the scale.

REFERENCES:
patent: 4483077 (1984-11-01), Matsumoto et al.
patent: 5253431 (1993-10-01), Smith
patent: 5363034 (1994-11-01), Tada et al.
patent: 5442865 (1995-08-01), Wallrafen
patent: 5798640 (1998-08-01), Gier et al.
patent: 5804963 (1998-09-01), Meyer
patent: 5841275 (1998-11-01), Spies

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