Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1996-06-11
1999-04-20
Brown, Glenn W.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324686, 324 7671, 361292, G01B 700, G01D 5241, G01R 2726, G01G 514
Patent
active
058960325
ABSTRACT:
A small position detection and positioning device detects relative displacement between two members with high precision. A moving medium-type memory device using such positioning device is also provided. The position detection device includes a linear array of first electrodes at equal pitches on one of the two members that have relative displacement in at least one dimension, and a linear array of at least one second electrode on the other member. The first electrodes are positioned opposite the second electrodes and separated from them by a minute gap. The first electrodes are divided into a first electrode set composed of alternate ones of the first electrodes, and a second electrode set composed of alternate ones of the first electrodes not in the first electrode set. A signal source which applies a first alternating signal to the first electrode set and a second alternating signal that differs in phase by 180.degree. from the first alternating signal to the second electrode set is connected to the first electrodes. A current detecting device that measures the current flowing in the at least one second electrode is connected to the at least one second electrode.
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Dobson et al., "Position Encoder," IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 242-243, Jun. 1978.
Saito Mitsuchika
Yagi Takaaki
Brown Glenn W.
Hardcastle Ian
Hewlett--Packard Company
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