Phonograph tone arm mounting, decoupling, vertical tracking angle adjustment system, and vertical guide system
US7630288B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Apr 7, 2005 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Sep 16, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved tone arm mounting system, for improved damping of tone arm system (100) vibrations. Tone arm system (100) is supported by tone arm pedestal (106). Adjuster screw (301) is affixed to the bottom of tone arm pedestal (106) so that adjuster screw axis of revolution (309) passes through or near tone arm system weight center of gravity (310). Adjuster screw (301), by threaded means, rotatably receives adjuster wheel (302), which is thin and is large in diameter, for easy access to its outer edge for manual or mechanical operation. Rotation of adjuster wheel (302) on adjuster screw (301) changes the height of tone arm pedestal (106) and thereby changes VTA (110).The tone arm system (100) is supported by arm board (206) without vertical connection to arm board (206) thereby damping mechanical vibrations and improving signal quality. A lightly loaded vibration damping washer (306) can be used between thrust bushing (307) and adjuster wheel (302) to damp or filter transfer of mechanical vibrations from tone arm system (100) to arm board (206) and back into tone arm system (100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.