Compact optical sensing system
US6905187B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2003 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Sep 17, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/16579
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A compact optical sensing system is used in hardcopy devices for scanning and/or printing images, for instance, using inkjet printing technology in desktop printing or in photographic printers appearing in grocery and variety stores. Several light emitting diodes (“LEDs”) illuminate a sheet of print media, and one or more photodiodes receive light reflected from the sheet. The photodiode generates signals in response to the light received, and the hardcopy device uses these signals to adjust printing parameters for optimal print quality. Using a chip-on-board process, the bare silicon die for each component is wire bonded directly to a printed circuit board assembly, allowing at least four LEDs (blue, green, red and soft-orange) to be grouped closely together in a space smaller than that occupied by a factory-made, single-packaged LED. A calibrating system uses a white target covered for cleanliness by a windowed door which is opened/closed by a printhead carriage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.