Patent ID: 6294907
Filing Date: 2001-09-25
Classification: G01R

Abstract:
A cross-coil indicating instrument comprising:a dial having a shaft hole;a shaft having a shaft end extending through said shaft hole;a pointer carried by said shaft end;a cup-shaped magnetic shield casing;a bobbin unit having an upper bobbin, a lower bobbin and a central chamber and disposed inside said shield casing, said upper bobbin having an upper center cylinder supporting an upper portion of said shaft and an upper winding frame disposed around said upper center cylinder to provide an upper winding space, said lower bobbin having a lower center cylinder for supporting a lower portion of said shaft and a lower winding frame disposed around said lower center cylinder to provide a lower winding space;a cross-coil unit disposed in said upper and lower winding spaces so that the upper surface of said cross-coil unit is flush with the upper surface of said upper winding frame and the lower surface of said cross-coil unit is flush with the lower surface of said lower winding frame; anda permanent magnet rotor disposed in said central chamber of said bobbin unit and fixed to said shaft to drive the same, whereinsaid magnetic shield casing has a through hole at the bottom thereof, and said lower center cylinder and said lower portion of said shaft extend through said magnetic shield casing behind said magnetic shield casing.