Nikon Corporation

Hisatoshi Fujiwara

Takashi Saegusa

A battery check device which assesses a state of exhaustion of a battery installed in a camera, and which can accurately assess at any time the state of exhaustion of the battery according to the drive state of a camera mechanism, such as a mirror. The battery check device includes a voltage detection device to detect the voltage of the camera battery, a drive detection device to detect the required time needed to drive the camera mechanism, a memory in which is stored the required time detected by the drive detection device, and a calculating device which inputs the battery voltage detected by the voltage detection device and the required time which has been recorded in the memory, and calculates a degree of exhaustion of the battery corresponding to these values. A display then displays the degree of exhaustion of the battery which has been found by the calculating device.

Battery check device for a camera

An optical system including a first microcomputer having a first communication terminal and a second communication terminal, a second microcomputer having a third communication terminal which is connected to the first communication terminal and sends and receives data, and a non-volatile memory having a fourth communication terminal which is connected to the second communication terminal and able to receive data, the non-volatile memory storing contents even after power to the non-volatile memory is turned OFF. The first microcomputer reads first data which is stored in a first region of the non-volatile memory, from the non-volatile memory via the second communication terminal, transfers the first data from the first communication terminal to the second microcomputer immediately after power is supplied, and uses second data, which is stored in a second region of the non-volatile memory and which has been transferred via the second communication terminal, to perform processing.

Growing community of inventors

Koganei, Japan

Hisatoshi Fujiwara