Toner concentration control device for a developing apparatus
US4901115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1987 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Oct 21, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0891
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing apparatus which includes a toner replenishing device for replenishing toner into the developing apparatus, a toner concentration detecting sensor for generating an output coresponding to the toner amount in a developing material stirred and transported through the developing apparatus, with the output containing a varying output periodically produced and stable output, a discriminating element for deriving the stable output of the outputs from the toner concentration detecting element, and a comparator for outputting a feeding signal to the toner replenishing device through comparison between the output from the discriminating element and a preliminarily set reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.