Fujitsu Corporation

Shinichi Yoshimoto

Hiroshi Yamada

Seigo Kotani

Yasushi Hara

Fumihiro Namiki

Makoto Yoshioka

Keiichi Murakami

Yoshiyasu Nakashima

Akira Shiba

Satoshi Kazama

Hideyuki Motoyama

Koichi Yokota

Hideyuki Hirano

Takehiko Hayashi

Kouichi Kanamoto

Masao Fujiwara

Tatsuro Masuda

A voltage conversion circuit is provided for efficiently converting the voltage of a DC power source into a lower voltage in accordance with load currents of voltage converters. An electronic apparatus includes: a DC power source for supplying a first DC supply voltage; a first DC voltage converter for converting the first DC supply voltage into a second DC supply voltage which is lower than the first DC supply voltage; a second DC voltage converter for converting either the first DC supply voltage or the second DC supply voltage at an input voltage terminal thereof into a third DC supply voltage which is lower than the second DC supply voltage; a switch for selecting and supplying one of the first DC supply voltage of the DC power source and the second DC supply voltage of the first DC voltage converter to the input voltage terminal of the second DC voltage converter, in accordance with a control signal; a switching controller for providing the control signal to the switch; and a plurality of components, ones of the components receiving the second DC supply voltage, ones of the components receiving the third DC supply voltage.

Electronic apparatus having DC voltage conversion function, and DC voltage converter

A portable information device, a power saving mode switching method, and a recording medium in which a power saving mode switching program is stored, for efficiently suppressing power generation peaks. In an information device having a component () such as a processor and a component () such as a magnetic disk device, it is detected whether it is the peak power generation condition or the peak power completion condition on the basis of access information to the component (), and a power mode change request is given to a power mode changing means (); and the power mode changing means () changes over the component () such as the processor from a normal power mode to a power saving mode where the operating voltage is reduced, the clock frequency is reduced, or the like when the peak power generation condition is detected, and changes over it from the power saving mode to the normal power mode when the peak power completion condition is detected.

Method and apparatus for changing power modes based on monitored I/O packets

An information processing apparatus having an information storage device, a power saving control method and a recording medium for storing the program therein, in which repetition of a periodic access pattern is recognized and the present mode is changed over to a power saving mode. In an information processing apparatus having an information storage devicesuch as a magnetic disc device, input/output data amount between a main unit of computer systemand the information storage deviceis monitored by an input/output data amount monitoring unit, recorded in an input/output data amount history storage unitat a sampling interval Y by an input/output data amount history management unit

Method, recording medium and apparatus for power saving control via detection of usage pattern based on stored history and accounting of a spin down cost

A program ID is provided for each authoring program, the program ID of the authoring program is copied to the program ID whenever the authoring program processes contents, and contents ID are newly generated and provided also for each contents. Thereby, the management of an authoring program or contents such as assuring of copyright, preventing of alteration, or maintaining of security is simplified.

Information management method and recording medium

The CPU in the processing unit of an external storage device transmits data between an information processing device and a storage medium, determines whether or not the information processing device can access the storage medium of the external storage device, decrypts data encrypted in the storage medium, etc. using a program loaded into RAM through an interface or a read/write unit. Changing the data loaded into the RAM efficiently and flexibly guarantees the security of the data stored on the storage medium.

Apparatus and method for controlling storage medium using security

A radiation image reading and erasing apparatus for deriving image signals in such a manner that an accelerated phosphorescence fluorescent material object, onto which radiation images are accumulated and stored, is scanned with an excitation light, and an accelerated phosphorescence fluorescent light, which is emitted from the accelerated phosphorescence fluorescent material object, is received. The apparatus is designed to obtain image data free of unwanted noises, and to occupy less space. The accelerated phosphorescence fluorescent material object is irradiated with a laser beam passing through a slit member to photomultipliers through reflection between sheets. The slit member may move with up-and-down motions. The sheets are taken-up or sent out by or from the associated take-up rollers, respectively, in accordance with the movement of slit member. The apparatus also has an erasing unit with a movable reflector to erase image information from the accelerated phosphorescence fluorescent material object.

Radiation image reading and erasing apparatus

In a radiation image reading apparatus, a photostimulated phosphor member absorbs a portion of radiation energy transmitted through an object and stores the absorbed radiation energy as a latent image. An excitation light source irradiates excitation light on the photostimulated phosphor member which then emits photostimulated luminescence light which is received and converged by an image reading device, and the latter outputting, as image information, an electrical signal which is dependent on a light intensity of the photostimulated luminescence light. A source of erasing light, having a spectral distribution band positioned substantially in a visible light region and which is normally ON, includes a shutter which is selectively opened to irradiate the erasing light on the photostimulated phosphor during an erasure time and otherwise is closed. A moving mechanism relatively moves the excitation light source and the image reading device with respect to the photostimulated phosphor member, in a moving direction which is perpendicular to the main scan direction.

Growing community of inventors

Kawasaki, Japan

Shinichi Yoshimoto