Moving-coil type stereo pickup cartridge
AssigneeKabushiki Kaisha Audio-Technica
InventorMitsuo Miyata
Life of this patent
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Abstract
Provided are a vibration unit which includes a pair of right and left coils that vibrate in response to vibration of a stylus attached to a cantilever and a magnetic circuit which includes a magnet and a pair of yokes and forms a magnetic path. The coils to be disposed in a gap between the pair of yokes are flat coils having perfect circular shapes, and V-shaped notches are formed on opposing surfaces, with the coils interposed therebetween, of the pair of yokes 4. An intersection angle of the V-shaped notch is set to be an angle to allow channel separation between right and left output signals to be obtained by the pair of coils to be equal to or larger than 20 db.
Claims12
A moving-coil type stereo pickup cartridge comprising:
- a vibration unit which includes
- a cantilever,
- a stylus attached to the cantilever, and
- a pair of right and left coils each having a circular shape that is attached to the cantilever and vibrates in response to a vibration of the stylus;
- and
- a magnetic circuit which includes a magnet and a pair of yokes having a gap therebetween to dispose the pair of right and left coils, and forms a magnetic path passing through the gap,
- wherein V-shaped notches are formed respectively on opposing surfaces, with the pair of right and left coils interposed therebetween, of the pair of yokes, and
- an intersection angle θ of the V-shaped notch is in a range of equal to or larger than 66 degrees and equal to or smaller than 70 degrees so that the pair of right and left coils obtains a channel separation between right and left output signals to be equal to or larger than 20 db.
Dependencies are inferred from the claim text.