Positioning apparatus

A positioning device (11) comprises a stationary frame (2), and at least two scales (20, 30) for measuring the location of the platform with respect to the frame, the scales having mutually different pitches (Pl; P2), and respective scanners (23, 33) providing respective scanner output signals (SM l...

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Bibliographic Details
Main Author HOEKSTRA PETER
Format Patent
LanguageChinese
English
Published 16.09.2009
Subjects
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
MEASURING
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
PHYSICS
TARIFF METERING APPARATUS
TESTING
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Summary:A positioning device (11) comprises a stationary frame (2), and at least two scales (20, 30) for measuring the location of the platform with respect to the frame, the scales having mutually different pitches (Pl; P2), and respective scanners (23, 33) providing respective scanner output signals (SM l, SM2)- A controller (6) receiving both scanner output signals is capable to uniquely calculate the position (X) of the platform with respect to the frame in a measuring range (MR) that is larger than the largest of said two pitches (Pl; P2).
Bibliography:Application Number: CN200780040591