Battery, camera and camera system

• US 7,911,531 B2
• Filed: 11/24/2004
• Issued: 03/22/2011
• Est. Priority Date: 12/01/2003
• Status: Expired due to Fees

• Current Assignee: Nikon Corporation
• Original Assignee: Nikon Corporation
• Inventors: Jiang, Hua
• Primary Examiner(s): Tran; Sinh
• Assistant Examiner(s): Daniels; Anthony J
• Application Number:
  US10/995,366
• Publication Number:
  US 20050117050A1
• Time in Patent Office: 2,309 Days
• Field of Search: 348/372, 320148-149, 320156-159, 320161-164
• US Class Current: 348/372
• CPC Class Codes: H04N 23/651 for reducing power consumption by affecting camera operations, e.g. sleep mode, hibernation mode or power off of selective parts of the camera

Abstract

A battery takes in a charge current value or a discharge current value from a current detection device at predetermined sampling intervals. Then, based upon the current value, a power consumption quantity representing the extent to which power has been consumed during a sampling interval is calculated and a total power consumption quantity is determined by sequentially adding the power consumption quantity corresponding to each sampling interval. Based upon the total power consumption quantity calculated at each sampling interval, a determination device determines as to whether or not the battery needs to be refreshed, and the determination results are transmitted to the camera. The camera informs the user that the battery needs to be refreshed if the determination device judges that a refresh operation is necessary. The sampling interval may be set longer when the power to the camera is in an OFF state compared to when the power to the camera is in an ON state.

Claims

1. A battery loaded in a camera, comprising:

a current detection device;

an arithmetic operation device that receives one of a charge current value and a discharge current value from the current detection device at predetermined sampling intervals, calculates a power consumption quantity indicating an extent to which power has been consumed during a sampling interval based upon the current value and calculates a total power consumption quantity by sequentially adding the power consumption quantity consumed during each sampling interval, with the total power consumption quantity indicating an extent to which the power has been consumed since a most recent refresh operation of the battery, where a refresh operation includes a discharging operation for eliminating an effect of a battery capacity becoming lower;

a determination device that determines as to whether the battery needs to be refreshed for eliminating the effect of the battery capacity becoming lower, based upon a comparison of the total power consumption quantity calculated at each sampling interval with a predetermined threshold value;

a communication device that transmits determination results by the determination device to the camera, and also receives information indicating a completion of a refresh operation for eliminating the effect of the battery capacity becoming lower, after the battery is subjected to the refresh operation; and

a control device that resets the total power consumption quantity as the information indicating the completion of the refresh operation for eliminating the effect of the battery capacity becoming lower is received by the communication device.

2. A battery according to claim 1, wherein:

the arithmetic operation device sets the sampling interval longer when power to the camera is in an OFF state compared to when the power to the camera is in an ON state.

3. A battery according to claim 1, wherein:

the refresh operation is an operation for discharging the battery completely.

4. A battery, comprising:

a current detection device;

an arithmetic operation device that receives one of a charge current value and a discharge current value from the current detection device at predetermined sampling intervals, calculates a power consumption quantity indicating an extent to which power has been consumed during a sampling interval based upon the current value and calculates a total power consumption quantity by sequentially adding the power consumption quantity consumed during each sampling interval, with the total power consumption quantity indicating an extent to which the power has been consumed since a most recent refresh operation of the battery, where a refresh operation includes a discharging operation for eliminating an effect of a battery capacity becoming lower;

a determination device that determines as to whether the battery needs to be refreshed for eliminating the effect of the battery capacity becoming lower, based upon a comparison of the total power consumption quantity calculated at each sampling interval with a predetermined threshold value;

a communication device that transmits determination results by the determination device to the outside, and also receives information indicating a completion of a refresh operation for eliminating the effect of the battery capacity becoming lower, after the battery is subjected to the refresh operation; and

a control device that resets the total power consumption quantity as the information indicating the completion of the refresh operation for eliminating the effect of the battery capacity becoming lower is received by the communication device.