Digital camera battery
Today, digital imaging is a prevalent reality that affords a new way to capture photos using a solid-state image sensor instead of traditional film. Digital image sensors based on semiconductor technology, such as matrix sensors based on charge coupled devices (CCD) and complementary metal oxide semiconductor (CMOS) technology, now make it possible to provide a large variety of devices with built-in imaging functions. A digital camera is well-known and widely used, in which an image sensor is driven, a liquid crystal display panel displays an image, and image data is read and written. A digital camera is comprised of an imaging device, an A/D converter, an image processing circuit, an image memory, a diaphragm mechanism, a shutter mechanism, and so forth. A primary (non-rechargeable) battery or a secondary (rechargeable) battery is loaded into the digital camera, by which the above electrical circuit, the flash device, the electrical viewfinder and the like are driven. Rechargeable batteries have been widely used to provide electrical power for driving battery powered electronic appliances. A battery pack having a battery cell as a secondary battery capable of charging such as a lithium-ion battery, a nickel cadmium battery, a nickel hydrogen battery, etc. has been employed. Because of their high energy density, lithium ion secondary batteries are increasingly used in recent years as portable power sources for laptop computers, mobile phones, especially digital cameras. In the digital camera battery packs, a microcomputer or microcontroller that calculates the remaining capacity of the battery and communicates with the digital camera, a peripheral circuit of the microcomputer, a state detecting circuit of the battery cell necessary for calculating the remaining capacity of the battery by the microcomputer, and a nonvolatile memory in which data necessary for calculating the remaining capacity of the battery is stored are incorporated. Rechargeable batteries require an electronic charger for recharging depleted digital camera batteries.
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