RF Radial choke for use in record playback apparatus
US4455638A · kind A · utility
6Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B15/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a record playback system which includes a substantially enclosed conductive arm carriage to support and translate a stylus/stylus arm assembly and an oscillator in the carriage to provide a signal at a given frequency, a symmetrical choke is formed in conjunction with the bottom of the carriage. The symmetrical choke is dimensioned to place an open circuit at a given radial distance from the stylus opening in the carriage bottom to reduce the radiation of energy from the playback system in a band of frequencies including the given frequency, and/or reduce the playback system's susceptibility to radiation from outside sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.