| 摘要 |
<p>PURPOSE:To achieve a high accuracy with light and small construction by arranging a mobile body equipped with a short ring for suppressing mutual induction between first and second coils. CONSTITUTION:A mobile body 41 with a short ring 7 for suppressing mutual induction is inserted into first and second coils 2 and 3 each with an air core. The ring 7 made of material high in the electric conductivity is formed in a ring. An induced elctromotive voltages of the coils 2 and 3 are turned to small voltages E2'' and E3'' suppressed in the level according to the shield space occupancy of the ring 7 and differential voltages E2'' and -E3'' generated associated with a displacement of the mobile body 41. This can improve the accuracy along with a light weight and a small size while falicitating the working and production.</p> |
