RF driver and control
US4841313A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Jun 16, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S347/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An RF drive network provides RF drive power to a device such as an ion deposition print cartridge synchronized with the natural resonance of the driver/device system. A voltage to current amplifier is fed by a power one-shot which triggers on a zero crossing feedback signal from the drive line, resulting in precise drive pulse synchronization and controlled drive power. A second feedback signal biases the amplifier to achieve uniformity in drive voltage and timing despite variations in component characteristics. A fault detector is connected to plural drive lines, and upon detection of an open line condition inhibits the drivers for all lines. A resonance shifting circuit shifts the resonance of each driver in its off state to damp oscillations and eliminate crosstalk between drivers. Preferred constructions drive ion deposition print cartridges for a selectable number of pulses for a desired charged distribution on a print drum, so as to achieve selective toner deposition and vary the print dot size or color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.