Moving magnet pickup cartridge
AssigneeKabushiki Kaisha Mitachi Onkyo Seisakusho
InventorTsugikuma Minamizono
Life of this patent
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Abstract
An electrodynamic type cartridge comprises two coiled bodies composed of two frames or cores made of magnetic permeability material wound respectively by coils along the longitudinal direction thereof, the axes of which are positioned in parallel therewith, and a magnet or an armature made of magnetic permeability material integrally formed with a stylus cantilever, which is positioned in parallel with the axes of the coil frames and on the plane dividing equally the distance between the axes and is so designed that the magnet or the armature is adapted movably for the flux penetrating the coil to cut the coil at a right angle. The respective cores form the major portion of the magnetic path.
Claims5
An electrodynamic type cartridge comprising
- two longitudinally extending coiled bodies each comprised of a pillar-shaped frame or core made of magnetic permeable material and each would by coils along its longitudinal direction, the center axes of said two coiled bodies being positioned in parallel with each other;
- a magnet formed integrally with a stylus cantilever, the center axis of which is disposed in parallel with the axes of said two coiled bodies and on the plane dividing equally the distance between the axes of said two coiled bodies, said magnet positioned with respect to said two coiled bodied such that it respectively forms a complete magnetic circuit with each of said cores by utilizing only the respective cores for the major portion of its magnetic path,
- the coils of the two coiled bodies being wound through only a portion of its respective core, the magnet being adapted movably whereby the constant flux from the magnet directly cuts the respective coils in a direction substantially perpendicular thereto, and wherein said coils and magnet are cooperatively positioned whereby the induced output voltage from the coils have the same phase.
Dependencies are inferred from the claim text.