Fujitsu Corporation

Makoto Saotome

Nobuhide Maruo

Keiichi Murakami

Kazuyuki Takaki

Arata Jogo

Takako Takanashi

Susumu Kashiwagi

Mika Misawa

Takayuki Hatanaka

Makoto Kotani

A portable terminal includes: a position obtaining section that obtains a piece of position information of a current position of the portable terminal; a power control section that controls turning on and off of power before and after the piece of position information is obtained by the position obtaining section, respectively; and a motion sensor that detects a movement of the portable terminal. The portable terminal further includes: a storage section that stores a history of the pieces of position information; and a recording section that records, into the storage section, a piece of position information newly obtained by the position obtaining section activated by the power control section, only when a movement is detected by the motion sensor.

Portable terminal, travel path recording method and program storage medium

An input device includes an acquisition unit to acquire touch region information including position coordinates of a plurality of sensors in a touch screen and a sensed value of each sensor, a first calculation unit to calculate a shape of a touch region based on the touch region information, and a second calculation unit to calculate a detected touch position detected as a touch position based on the shape.

Input device and method for touch position calculation

A lock system that unlocks a lock with an unlock signal, prevents malfunction of locking or unlocking, and reduces power consumption of a receiving unit side that receives the unlock signal. The lock system avoids radio wave interference of the unlock signal and prevents malfunction of locking or unlocking by providing irregularity in a transmission timing of the unlock signal to a device that unlocks a lock with the unlock signal. In regard to a reception of the unlock signal, the lock system sets a receiving window by setting a reception-ON time and a reception-OFF time, and by stopping an operation of the receiving unit except during the reception-ON time, reduction of power consumption can be achieved.

Lock system, unlock device, apparatus, portable terminal device, unlock method, unlock program, and circuit device

A power usage method is provided for using power supplied from a first device at a second device. The power usage method includes causing the second device to perform an initialization process to obtain a value of a current used when consuming the power at a voltage that is a minimum prerequisite for the second device to perform a predetermined process; and causing the second device to execute the predetermined process while consuming the power in a manner that the current does not exceed the obtained value.

Power usage method and device that receives power from host

A device connected to a bus and a device driver for controlling the device, capable of preventing the device from falling into a forced use suspension (disable) state. Prior to notice of power consumption by a USB device connected to the bus(USB), the device driver acquires knowledge of remaining electric power that can be supplied by the bus. According to whether the remaining electric power is satisfactory for power consumption expected to be notified of by the USB device, the device driver permits the notice of power consumption by the USB device and causes the bus to start electric power supply, or executes avoidance processing in order to avoid shortage of power.

Device driver and device

There is provided an electronic device capable of device testing by using inexpensive testing devices. The electronic device is comprised of a receiver for receiving signals from a shield line and able to be connected by a serial bus including data lines D+ and D&#x2212;, and the shield line, and an identification unit connected with the receiver for identifying the received signals, and a testing controller for performing self-tests based on the identification results.

Electronic device

A communication device is constructed to include a detecting section for detecting a signal peculiar to a universal serial bus (USB) obtained via the USB, and a disconnecting section for disconnecting a line which is being used for a communication when the signal peculiar to the USB is not detected by the detecting section within a predetermined time.

Communication device disconnecting a communication line by detecting an abnormal state of computer equipment

An electronic apparatus comprising a radio transmitter is disclosed. In a computer system () having a radio transmission circuit () of a phase modulation type supplied with power from a power supply () of a switching type, the switching frequency of the power supply () is determined based on the comparison frequency for the sampling operation of a PLL circuit () of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.

Electronic apparatus having radio transmitter

A ring oscillator circuit of one aspect includes a plurality of logic gates connected in cascade in a ring form and a plurality of signal lines each disposed between adjacent ones of the plurality of logic gates, and one of the signal lines is disposed in a spiral form in a pair together with another signal line. A ring oscillator circuit of another aspect includes a plurality of logic gates connected in cascade in a ring form and a plurality of signal lines whose wiring layout is made using wiring layers of a multi-layer structure and which are disposed between adjacent ones of the plurality of logic gates, and one of the signal lines is disposed spirally in such a manner as to be close to itself at portions thereof in at least two of the wiring layers of a multi-layer structure. When such a layout of the signal lines is employed, the difference between the frequency of the pulses actually output and the frequency of the output pulses based on simulation can be reduced to minimum.

Growing community of inventors

Kawasaki, Japan

Makoto Saotome