Canon Kabushiki Kaisha

Hirokimi Shimizu

Shigehisa Kitani

Atsuyoshi Sasai

It is an object to provide a data terminal which can give a surplus for switching a power supply to an AC adapter and continuing communication without exerting an adverse influence on the server side when a battery voltage of a data terminal drops to the user. To accomplish this object, a microcomputer in an adapter connected to a communication network via a cellular phone or PHS discriminates an operating mode of the adapter when the low-power voltage is detected by an interruption signal from a power supply during the connection of communication with an image server connected to the communication network. While data from the image server is being received or the received data is being printed, the microcomputer waits for seconds while expecting a recovery of the power voltage. If the power supply is exchanged to a new battery or the AC adapter is inserted by the operator during this period of time, the printing operation is resumed.

Method of stopping an operation, maintaining the network connection of the data terminal, and warning the user in response to a low-voltage condition

An electronic equipment comprises a keyboard for entering data, a processor for processing the data entered by the keyboard, a display device for displaying processing result of the processor, an illumination lamp for illuminating a display screen, and a control circuit for turning off the illumination a predetermined time after the display of the processing result on the display device.

Electronic equipment having a display device

A light communication equipment comprises a photo-sensor for sensing a modulated light signal, a processor for demodulating the light signal sensed by the photo-sensor and processing it, and a keyboard having a plurality of keys for instructing processing to the processor. The processor is housed in a housing and the keyboard is attached to the housing. The photo-sensor has a photo-sensing direction which is on a line extending from a longitudinal line on the keyboard.

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Yokohama, Japan

Hirokimi Shimizu