Electronic apparatus

• US 9,043,175 B2
• Filed: 05/24/2011
• Issued: 05/26/2015
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tohyama, Kei
• Primary Examiner(s): Barbee, Manuel L
• Application Number:
  US13/114,985
• Publication Number:
  US 20110221395A1
• Time in Patent Office: 1,463 Days
• Field of Search: 702/60, 702 63- 65, 324/427, 324/431, 320/127, 320/132, 340/636.1, 340/636.12, 340/636.13, 340/636.15
• US Class Current: 702/63
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/3828 using current integration

Abstract

When discharge power calculated based on a current value detected by a current detector is smaller than expected maximum power, which is the maximum power expected in an actual operation, a discharge efficiency at the expected maximum power is set as a discharge efficiency used for remaining capacity calculation. This ensures that a remaining capacity based on power required for a photographing operation can be detected.

Claims

1. A battery pack comprising:

a first detecting unit that detects a remaining capacity of a battery pack by using a first discharge efficiency if a discharge power of the battery pack is smaller than a predetermined power,

wherein the first discharge efficiency is detected by using the predetermined power and a temperature of the battery pack; and

a second detecting unit that detects a remaining capacity of the battery pack by using a second discharge efficiency if the discharge power is not smaller than the predetermined power, wherein the second discharge efficiency is detected by using the discharge power and the temperature of the battery pack.

2. The battery pack according to claim 1, wherein the predetermined power includes an expected consumption power relating to an electronic apparatus if the electronic apparatus and the battery pack are connected.

3. The battery pack according to claim 1, wherein the predetermined power includes a power relating to an operation mode of an electronic apparatus if the electronic apparatus and the battery pack are connected.

4. The battery pack according to claim 1, wherein the predetermined power includes a power relating to an external apparatus if an electronic apparatus is connected to the battery pack and the electronic apparatus is connected to the external apparatus.

5. The battery pack according to claim 4, wherein the external apparatus includes at least one of a hard disk device, a flashlight device, and a lighting device.

6. The battery pack according to claim 1, wherein an electronic apparatus includes a motor, and the predetermined power includes a power relating to a state of the motor if the electronic apparatus and the battery pack are connected.

7. The battery pack according to claim 1, wherein the predetermined power includes a power relating to a state of an electronic apparatus if the electronic apparatus and the battery pack are connected.

8. An electronic apparatus comprising:

a detecting unit that detects a second remaining capacity of a battery pack by using a first discharge efficiency and a second discharge efficiency if a consumption power of the electronic apparatus is smaller than a predetermined power, wherein the first discharge efficiency is detected by using the predetermined power and a temperature of the battery pack, and the second discharge efficiency is detected by using the consumption power and the temperature of the battery pack; and

a control unit that causes a display unit to display information indicating a first remaining capacity if the consumption power is not smaller than the predetermined power,

wherein the first remaining capacity is obtained from the battery pack.

9. The electronic apparatus according to claim 8, wherein the predetermined power includes an expected consumption power relating to the electronic apparatus if the electronic apparatus and the battery pack are connected.

10. The electronic apparatus according to claim 8, wherein the electronic apparatus includes a motor, and the predetermined power includes a power relating to a state of the motor if the electronic apparatus and the battery pack are connected.

11. The electronic apparatus according to claim 8, further comprising:

an obtaining unit that obtains the first remaining capacity from the battery pack.

12. The electronic apparatus according to claim 11, wherein the obtaining unit obtains a temperature detected by the battery pack.

13. The electronic apparatus according to claim 8, wherein the predetermined power includes a power relating to a state of the electronic apparatus if the electronic apparatus and the battery pack are connected.

14. The electronic apparatus according to claim 8, wherein the electronic apparatus includes an apparatus for displaying an image.

15. The electronic apparatus according to claim 8, wherein the electronic apparatus includes an image capture apparatus.

16. A non-transitory computer-readable storage medium storing a program executed by a computer to perform a control method, the control method comprising:

detecting a remaining capacity of a battery pack by using a first discharge efficiency if a discharge power of the battery pack is smaller than a predetermined power, wherein the first discharge efficiency is detected by using the predetermined power and a temperature of the battery pack; and

detecting a remaining capacity of the battery pack by using a second discharge efficiency if the discharge power is not smaller than the predetermined power,

wherein the second discharge efficiency is detected by using the discharge power and the temperature of the battery pack.

17. A non-transitory computer-readable storage medium storing a program by a computer to perform a control method, the control method comprising:

detecting a second remaining capacity of a battery pack by using a first discharge efficiency and a second discharge efficiency if a consumption power of an electronic apparatus is smaller than a predetermined power, wherein the first discharge efficiency is detected by using the predetermined power and a temperature of the battery pack, and the second discharge efficiency is detected by using the consumption power and the temperature of the battery pack; and

causing a display unit to display information indicating a first remaining capacity if the consumption power is not smaller than the predetermined power, wherein the first remaining capacity is obtained from the battery pack.