Moving-coil type stereo pickup cartridge
US9497548B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 2015 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Dec 3, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.