Obtaining pressure of an operating environment of a bi-directionally scanning electrographic device for implementing corrections per pressure
US8203588B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2010 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | Aug 18, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0435
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods and apparatus include improving print quality of a bi-directionally scanning electrophotographic (EP) device, such as a laser printer or copy machine, according to ambient pressure in which operated. A moving galvanometer or oscillator reflects a laser beam to create scan lines of a latent image in opposite directions. A damping of the motion occurs per air density implicated by temperature and pressure, where the pressure changes occurring especially from altitude changes. During use, a drive signal, such as a pulse train, moves the galvanometer or oscillator at or near its resonant frequency. Based on a parameter of the drive signal, such as pulse width, the ambient pressure can be made known. In general, a high-pressure environment requires a relatively longer pulse width to resonate the galvanometer or oscillator in comparison to a shorter pulse width for a low-pressure environment. Corrections to print quality stem from the determined ambient pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.