Lumped parameter resonator of a piezoelectric speaker
US6137890A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1997 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | May 6, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Piezoelectric speaker achieves radiation efficiency at low frequencies by using a piezoelectric speaker panel as a lumped parameter resonator. The speaker panel is mounted in a resonant system for generating translational motion. The resonant system includes suspension devices for suspending the panel to allow for translational motion of the panel and isolators for tuning the speaker panel to a predetermined frequency. At the predetermined frequency, the speaker panel achieves resonance in a low order mode, producing improved radiation efficiency at lower frequencies and translational motion of the panel not possible with a piezoelectric activator alone. The speaker panel may be included in a portable computer system, a desktop computer monitor, or other sound systems. In a portable computer system, a display screen or front speaker panel serves as a lumped parameter resonator, and the lid or rear speaker panel serves as a structure born vibration resonator. The front speaker panel may be driven or excited by coupling a piezoelectric actuator or a plurality of actuators to the front speaker panel, the rear speaker panel, or both panels. When the piezoelectric actuator is coupled to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.