Densitometer and circuitry with improved measuring capabilities of marking particle density on a photoreceptor
US5119132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Oct 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates generally to an electrographic apparatus and more specifically to an improved structural arrangement in electrographic apparatus of the type having a densitometer, which arrangement achieves improved measuring of marking particle density on a photoreceptor or the like. Wherein, use of a charge-coupled device (CCD) allows for a pixel-by-pixel recordation of the photo intensity reflected off of the photoreceptor and toner test patch. Therefore, as a result of the increased sensitivity of the toner measuring, it is possible to measure denser patches of toner, both black as well as color. Thus allowing for accurate monitoring of the amount of toner capable of being placed onto a photoreceptor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.