Hitachi, Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Renesas Technology Corp.

Hitachi Ulsi Systems Co., Ltd.

Hitachi Computer Peripherals Co., Ltd.

Kenji Nishimura

Yasuhiko Kokami

Azusa Gojyo

Tatsuya Negishi

Junichi Sato

Akira Kurano

Toshiaki Mori

Katsuhiro Tsuneta

Kiyotaka Takahashi

Tsuneo Hirose

Toshiyuki Haruna

Hiroshi Satou

Kenji Yoshida

Yuji Yoshida

Riichi Nakano

Kazuto Takahashi

Tadayuki Ichiba

An information processing deviceis provided with a first option group area where a slide operation of options of a first search criterion can be performed and a second option group area where a slide operation of options of a second search criterion can be performed, a slide operation performed in a direction different from that of the above-mentioned slide operation to switch the display of hierarchical options of the first search criterion can be performed in the first option group area, and a selection area is provided including a predetermined number of options of the first search criterion and a predetermined number of options of the second search criterion.

Information processing device

Disclosed is a technique for providing an image display device enabling a user to understand the entire correspondence relationship between a three-dimensional photographed image and a two-dimensional map image. According to the technique, when a photographed image and a map image in the imaging position are separately displayed on the screen of an image display unit, a map drawing unitreads the position information (x, y) of the camera and the azimuth angle &#x3c6; of the camera, reads a view angle &#x3b8; of the camera, and reads map data around the imaging range of the camera using the position information (x, y) of the camera to process and draw the map image so that the view angle &#x3b8; and the azimuth angle &#x3c6; match the view angle &#x3b8; and the azimuth angle &#x3c6; of the photographed image taken by the camera.

Image display device

There is provided a technique for controlling drive of a voice coil motor which can select, with priority for effective reduction, any one of heat generation and EMI noise which are presumed to induce a read/write error and for simultaneously realizing the positioning control of magnetic head with higher accuracy during the tracking operation and the high speed access with shortening of the seek operation period. The magnetic disc storage apparatus introducing this technique is provided with a mode to drive with linear control a coil of the voice coil motor from both terminals and a mode to drive one terminal of coil with linear control and the other terminal with pulse width control. Thereby, the coil is driven in the drive mode of linear control during the tracking operation, while one terminal of coil is driven with linear control and the other terminal with pulse width control during the seek operation.

Magnetic disc storage apparatus

In a magnetic disk storage apparatus, when power supply is stopped, a magnetic head can be retracted safely and quickly so as not to be damaged. There are provided a back electromotive a force detector that detects back electromotive forces developed in coils of a voice coil motor for moving a magnetic head when power a supply is stopped, and a brake controller that judges a movement speed of the magnetic head from the detected back electromotive forces, and brakes the voice coil motor when the movement speed is greater than a preset first limited speed.

Magnetic disk storage apparatus and method for controlling magnetic disk storage apparatus

A magnetic disc storage apparatus including a magnetic head for reading information from a storage track on a magnetic storage disc driven to spin, a voice coil motor for moving the magnetic head above the disc, and a magnetic head drive system for executing a position control of the magnetic head by controlling driving current of the voice coil motor by a feedback control while monitoring a state of reading the magnetic head in which the magnetic head drive system includes multi-mode driving means for executing a linear drive mode for controlling, as an analog amount, the driving current of the voice coil motor when an amount of driving to move the magnetic head is small and executing a pulse drive mode for controlling, as a digital amount, the driving current of the voice coil motor when the amount of driving to move the magnetic head is large. By the invention, both of high accuracy formation of position control of the magnetic head in tracking and high speed formation of access by shortening seek time are enabled while effectively reducing heating or EMI inducing read/write error.

In a magnetic disk unit for recording/reproducing data onto/from a disc by means of a magnetic head on the basis of a seek command and a recording/reproducing command received from a host processor, the execution of the data reproducing command for the disk is started upon detection of a state that the magnetic head has sought on a desired track to an extent that the centering state is still unstable but the data can be reproduced, and the execution of the data recording command is started upon detection of a condition that the magnetic head has reached the stable centering state on the desired track after the detection of the reproducible state.

Recording/reproducing method and apparatus of magnetic disk unit in

Growing community of inventors

Kanagawa, Japan

Kenji Nishimura