Image gradation setting device for use in an image forming apparatus
US5748857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1995 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Nov 30, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4072
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image gradation setting device includes a control density level determining portion for determining based on received image data a control density level indicative of a light amount for each of the first to n-th imaging areas of one imaging element. The control density level determining portion allots only to the first imaging area a control density level in accordance with received image data if the received image data is equal to or lower than a predetermined reference density level, and respectively allots to the first to n-th imaging areas control density levels in accordance with received image data if the received image data is larger than the predetermined reference density level, a minimum control density level of each of the second to n-th imaging areas being made to be larger than a particular control level equivalent to the particular light amount, and a maximum control density level of each of the first to (n-1)-th imaging areas being made to be the particular control level smaller than a control density level equivalent to the predetermined reference density level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.