Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1989-05-24
1991-02-19
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324704, 324723, 338171, 338202, G01R 2702, H01C 1032
Patent
active
049947524
ABSTRACT:
A position detecting apparatus electrically detects the present position of a moving body reciprocated within a movable region. The apparatus comprises a resistance section continuously disposed by a predetermined length along the reciprocating direction within a detecting region corresponding to the movable region on a substrate composed of an insulator. A plurality of region discriminating patterns are formed by combining a conductive section discontinuously disposed by a predetermined length along the reciprocating direction within the detecting region on the substrate, and an insulating section having no conductor. An electric brush is provided which is connected to the moving body and reciprocated within the detecting region in a state in which the brush slidably contacts the resistance section and the plurality of region discriminating pattern section. A first position detector detects the position of the moving body based on a resistance value corresponding to the position of the brush when the brush is located on the resistance section. A second position detector detects the position of the moving body by detecting a predetermined kind of combination of the conductive section and the insulating section when the brush is located on the region discriminating pattern sections; both the resistance section and the region discriminating pattern sections are disposed on the substrate. Another position detecting apparatus may be used by electrically detecting the present position of the moving body reciprocated within the movable region.
REFERENCES:
patent: 4247816 (1981-01-01), Harrer et al.
patent: 4568876 (1986-02-01), Maisch
patent: 4706062 (1987-11-01), Mannle et al.
Eisenzopf Reinhard J.
Harvey Jack B.
Ricoh & Company, Ltd.
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