System connecting power supply line to image sensing device upon data transport
US6580460B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1998 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Feb 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/00904
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to the invention, a power supply for an image sensing device is obtained from a printer to prevent consumption of the battery. When the image sensing device is connected to the printer, a power management unit checks if electric power can be supplied from the printer. When electric power can be supplied from the printer, the power management unit switches the power supply from the battery to a power supply receiving/supplying unit that receives electric power from the printer. In this case, if the remaining capacity on the battery is small, the battery is charged by electric power from the printer. Also, the luminance of a display unit is increased, or the operation frequency of a control unit is raised. On the other hand, when electric power cannot be supplied from the printer, the power management unit switches the power supply to the battery. In this case, the power management unit reduces consumption power by decreasing the luminance of the display unit or reducing the operation frequency of the control unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.