Image recording apparatus using optical beam
US5463410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1994 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Jun 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/1657
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a laser beam printer, automatic optical quantity (APC) control is performed based on an optical quantity detection output to generate a laser beam having a predetermined quantity of light. In each scanning cycle, APC is effected by utilizing a period (unblanking period) in which the laser device is forcibly actuated to generate a horizontal synchronization signal. The unblanking period may be changed according to the print paper size or image formation/non-image-formation periods. Also, light quantity control may be effected through a plurality of scanning cycles before image formation and may be effected by utilizing the unblanking period during the period corresponding to the intervals of print sheets. Techniques also provided to prevent a transfer unit from being contaminated by toner images formed as a byproduct of APC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.