Moving coil type stereophonic pickup cartridge

A moving coil type stereophonic pickup cartridge comprising:

• a. a body, a cantilever vibrationally supported at its rearward end by the body, and a stylus fixed to the forward end of the cantilever;
• b. an armature made of high magnetic permeability material fixed to the cantilever for movement therewith, the armature comprising a first leg portion, a second leg portion, and a third leg portion, the first, second, and third leg portions being fixed to the cantilever in the immediate vicinity of the vibration fulcrum of said cantilever, the first leg portion fixed to the rearward portion of the cantilever and arranged parallel to the axial direction of the cantilever, the axes of the second and third leg portions being substantially orthogonal to that of the first leg portion, and the angle between the axes of the second and third leg portions being set at an angle which is formed by side walls of a stereophonic record disc sound groove, the second and third leg portions extending from the first leg portion;
• c. a pair of moving coils, one each of the coils being situated on the second leg portion and on the third leg portion of said armature;
• and
• d. a magnetic source, only one pole of the magnetic source being in the vicinity of the vibration fulcrum of the cantilever, and the first, second, and third leg portions of the armature and their extensions which extend from the cantilever thus forming an open return.

A moving coil type stereophonic pickup cartridge comprising:

• a. a body, a cantilever vibrationally supported at its rearward end by the body, and a stylus fixed to the forward end of the cantilever;
• b. an armature made of high magnetic permeability material fixed to the cantilever for movement therewith, the armature comprising a first leg portion, a second leg portion, and a third leg portion, the first leg portion fixed to the rearward end portion of the cantilever and arranged parallel to the axial direction of the cantilever, and the second and third leg portions extending radially from the axis of said first leg portion;
• c. a pair of moving coils, one each of the coils being situated on the second leg portion and on the third leg portion of said armature;
• and
• d. a magnet, only one pole of which is adjacent to the three leg portions of the armature, the one pole having a groove in the face thereof nearest the armature, the groove being parallel to the axis of the cantilever, whereby the magnetic circuits thus formed consist essentially of the magnet, the respective leg portions of the armature, and an open return.