Scanner with battery

• US 20090230773A1
• Filed: 03/17/2008
• Published: 09/17/2009
• Est. Priority Date: 03/17/2008
• Status: Active Grant

• Current Assignee: Electronic Document Technology Pte., Ltd.
• Original Assignee: Electronic Document Technology Pte., Ltd.
• Inventors: Liu, Chang-Ming, Chang, Cheng-Hsien, Tan, Hin Leong
• Granted Patent: US 8,283,805 B2
• Time in Patent Office: Days
• US Class Current: 307/48
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H04N 1/00885 Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
• CPC Class Codes: H04N 1/00899 Detection of supply level or supply failure
• CPC Class Codes: H04N 1/00901 Using different supplies or connection to an external supply H04N1/00893, H04N1/00896 take precedence
• CPC Class Codes: H04N 1/00904 Arrangements for supplying power to different circuits or for supplying power at different levels H04N1/00896 takes precedence

Abstract

Power is provided to a scanning device. Power supplied by an attached bus is used to power the scanning device when power requirements for the scanning device can be met by the power supplied by the attached bus. Power is drawn from a rechargeable battery to supply power to the scanning device when power requirements for the scanning device cannot be met by the power from the attached bus. When the scanning device is in a stand-by mode, the power from the attached bus is used to recharge the rechargeable battery.

Claims

1. A scanning device, comprising:

a bus interface for connection to a bus, the bus providing a power source for the scanning device;

a motor used for moving media with respect to the scanning device;

an image sensor used to scan the media;

a rechargeable battery; and

a charging circuitry;

wherein the charging circuitry draws power from the bus and charges the rechargeable battery, the rechargeable battery supplying power to the motor and the image sensor whenever the scanning device requires power which exceeds a maximum power provided by the bus.

2. A scanning device as in claim 1 wherein the bus is a Universal Serial Bus (USB).

3. A scanning device as claim 1, additionally comprising:

an input for an external power source, the input allowing the external power source to supply power for operation of the motor and the image sensor.

4. A scanning device as claim 1, additionally comprising:

a switch coupled to the rechargeable battery, the switch electrically isolating the rechargeable battery whenever the bus interface is not connected to the bus.

5. A scanning device as claim 1, additionally comprising:

a switch coupled to the rechargeable battery, the switch electrically isolating the rechargeable battery whenever the scanning device consumes less power than is available from the bus.

6. A scanning device as claim 1, additionally comprising:

a switch coupled to the rechargeable battery, the switch electrically isolating the rechargeable battery whenever the motor is not energized.

7. A scanning device as claim 1, additionally comprising:

a switch coupled to the rechargeable battery, the switch electrically isolating the rechargeable battery whenever the image sensor is not energized.

8. A scanning device as claim 1, wherein the charging circuitry is enabled when the motor is not energized, and disabled when the motor is energized.

9. A scanning device as in claim 1 additionally comprising:

a step up voltage unit that increases signal voltage before a signal is applied to at least one of the motor and the image sensor.

10. A scanning device as in claim 1 wherein the image sensor is capable of scanning both sides of the media.

11. A method for providing power to a scanning device, the method comprising:

using power supplied by an attached bus to power the scanning device when power requirements for the scanning device can be met by the power supplied by the attached bus;

drawing power from a rechargeable battery to supply power to the scanning device when power requirements for the scanning device cannot be met by the power from the attached bus; and

,

using the power from the attached bus to recharge the rechargeable battery.

12. A method as in claim 11, wherein the bus is a Universal Serial Bus (USB).

13. A method as in claim 11, additionally comprising:

using power from an additional external power source to operate the scanning device.

14. A method as in claim 11 additionally comprising:

stepping up voltage of a power signal received from the attached bus; and

,

stepping up voltage of a power signal received from the rechargeable battery.

15. A scanning device, comprising:

a rechargeable battery;

means for receiving a power signal from a bus;

means for scanning an image from media;

means for selecting the power signal from the bus to provide power to the scanning device when the power requirements for the scanning device can be met by the power signal from the bus;

means for selecting the rechargeable battery to provide power to the scanning device when the power requirements for the scanning device cannot be met by the power signal from the bus; and

,

means for recharging the battery from the power signal from the bus.

16. A scanning device as in claim 15 wherein the bus is a Universal Serial Bus (USB).

17. A scanning device as claim 15, additionally comprising:

means for allowing an additional external power source to supply power for operation of the scanning device.

18. A scanning device as in claim 15 additionally comprising:

means for stepping up signal voltage within the scanning device.

19. A scanning device as in claim 15 wherein the means for scanning includes means for scanning both sides of the media.