Image forming apparatus for controlling image density using logarithm compressing means
US5365313A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1993 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Mar 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A toner depositing amount measuring apparatus for measuring the amount of toner deposited on a photosensitive drum includes a light source for irradiating the surface of the photosensitive drum with light and a photoelectric converting section for receiving the reflected light and converting the received reflected light into an electric signal. A logarithmic calculation is applied to the output signal of the photoelectric converting section in a logarithm-compressing section. The temperature characteristics of the logarithm-compressing section are compensated for in a temperature compensating section. The amount of the toner deposition is calculated in a toner depositing amount calculating section based on a difference between the data during non-deposition of the toner and the data during deposition of the toner, the data being obtained from the logarithm-compressing section. Further, image forming conditions are changed in a control section in accordance with an output signal denoting the calculated deposition amount of the toner so as to control the density of the image formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.