Patent ID: 6100681
Filing Date: 2000-08-08
Classification: F16C,G01B,G01D,H02K

Abstract:
A linear encoding device of a guiding device including a long base stand and a table slidably guided along a longitudinal direction of said base stand,the linear encoding device comprising a detected element mounted to said table and a detecting element mounted to said base stand, wherein:said detecting element comprises a plurality of Hall IC's;said Hall IC's comprise first Hall IC's arranged at equal pitches in said longitudinal direction and second Hall IC's arranged at said equal pitches in line or in parallel with said first Hall IC's, the second Hall IC's being shifted in the longitudinal direction by a quarter of said pitch relative to said first hall IC's, corresponding to a phase difference of 90 degrees to said first Hall IC's in said longitudinal direction;said detected element comprises a rectangular board-like field magnet wherein a single magnetic pole thereof faces toward said Hall IC's, and having a length of a half of said pitch corresponding to a phase of 180 degrees, wherebysaid Hall IC's detect said field magnet and output signals of a phase A corresponding to the first Hall IC's and a phase B corresponding to the second Hall IC's.