Hitachi-lg Data Storage, Inc.

Hitachi, Ltd.

Hitachi Consumer Electronics Co., Ltd.

Hitachi Computer Engineering Co., Ltd.

Norimoto Ichikawa

Hiroyuki Minemura

Hisataka Sugiyama

Toshimitsu Kaku

Shinji Fujita

Nobuhiro Takeda

Kenji Akahoshi

Atsushi Yamada

Atsushi Fuchiwaki

Kenji Tokumitsu

Mitsuru Harai

Hisahiro Hayashi

Naoya Matsuura

Takuya Himi

Makoto Seita

There is provided a distance measurement system in which a plurality of distance measurement sensors are installed to detect an object in a measurement area, the system including: a detection intensity distribution display device that performs quantification according to light intensities of light which reaches the object after being emitted from the distance measurement sensors, or point cloud numbers, and displays colors or lights and shades according to magnitudes of numerical values to perform visualization and a display. The detection intensity distribution display device regards a space in front of the distance measurement sensors as one cube, divides the cube into a plurality of small cubes (voxels), and quantifies a detection intensity according to the light intensity of the light that reaches each of the voxels after being emitted from the distance measurement sensors, or the point cloud number of each of the voxels.

Distance measurement system and method for displaying detection intensity distribution of distance measurement sensor

The present invention provides an omnidirectional distance measuring device that covers a wide detection range and does not require adjustment of each of the detection areas of a plurality of distance measuring sensors. In the omnidirectional distance measuring device, a plurality of distance measuring sensors that measure a distance to a target are disposed radially around a central axis so as to be close to each other. The plurality of distance measuring sensors are integrally configured such that a detection center direction of each of the plurality of distance measuring sensors is inclined by a predetermined angle from a plane perpendicular to the central axis. As the distance measuring sensor, a TOF sensor that measures a distance based on a flight time of light or a stereo camera that measures a distance using parallax of a pair of cameras is used.

Omnidirectional distance measuring device

A recording/reproducing device and a recording/reproducing method, which are capable of improving reliability of data while securing compatibility with a file format employed in a recording medium are provided. Provided is a reconstruction method of reproduction data acquired from a reproducing device that reproduces data from a recording medium in which the data is recorded, performs error correction using a second error correction code specified in a file format employed in the recording medium, and outputs reproduction data, and the reconstruction method of the reproduction data includes obtaining reproduction data from the reproducing device, reading a first error correction code different from the second error correction code from the reproduction data, and performing error correction on the reproduction data using the first error correction code and reconstructing user data.

Recording and reproducing device for reconstructing user data

In an optical disk library device using a plurality of optical disk devices, before optical disk devices execute recording or reproduction of information to or from optical disks, self-monitoring information is acquired from an optical disk monitor, use preferential orders of the optical disk devices are evaluated on the basis of use frequency information or deterioration information included in the self-monitoring information and an optical disk device to be used for recording or reproduction of information is selected on the basis of the use preferential orders.

Optical disk library device and optical disk device selecting method

Provided is a technology in which a controller for controlling read/write performed to/from an optical disc includes a processor for controlling an interface, a temporary memory unit, a rotation control unit, and an optical control unit. The controller causes the processor to shift to a hibernate state when a predetermined condition is satisfied, and causes the processor to recover from the hibernate state into an active state when the interface receives a first command. The processor receives the first command from the interface, instructs the rotation control unit to drive the optical disc at a predetermined target rotational speed, instructs the optical control unit to perform a processing specified by the first command, transmits a completion notification of the first command to the interface with a delay, receives a second command after transmitting the completion notification of the first command, and executes the processing of the second command.

Optical disc drive and hibernation recovery method for an optical disc drive

In an optical disc device employing a CLV method, executing pickup return processing when focus drop occurs during recording poses problems of increased waiting time for rotation and increased focus servo recovery processing time. When defocusing occurs and focus pull-in cannot be achieved by retry, a first rotation frequency at a radial position thereof is calculated. Next, a second rotation frequency at the innermost circumferential position at the current speed is calculated. Next, a third rotation frequency at a radial position where recording is restarted after focus servo recovery is calculated. Next, a fourth rotation frequency at pickup return position at a different speed is calculated. Next, based on the relationship among the first to fourth rotation frequencies described above, a rotation speed at pickup return is selected so that a rotation frequency difference becomes the smallest in all conditions: at pickup return from defocusing, servo recovery after pickup return, and access operation after the servo recovery.

Focus servo recovery processing method for optical disc device and optical disc device

An information recording apparatus and method for recording information of a recording block including a plurality of sectors as one verifying unit into an optical information recording medium, a recording area of the optical information recording medium including a plurality of zones, and wherein each zone is different in a sector number per round of a track. A recorder records information of a plurality of recording blocks into the optical information recording medium and a verification conductor conducts a verify control. A number of the recording block included in the verifying unit is determined to be a minimal number in a rotation waiting sector number.

Information recording/reproducing apparatus

An information recording/reproducing apparatus for recording information by recording information of a plurality of sectors as one recording unit into an optical information recording medium. A recording area of the optical information recording medium including a plurality of zones, wherein each zone is different in a sector number per round of a track having recording means for recording information of a plurality of sectors over a plurality of zones into the optical information recording medium, and conducting means for conducting a verify control. The recording and a timing of the conduction of the verify control are determined for each zone when the information of a plurality of sectors is to be recorded over the plurality of zones when the zone is changed over during the recording.

Information recording/reproducing apparatus having verify control for recording

A method for recording information and information recording/reproducing apparatus wherein information of a plurality of sectors is recorded as one recording unit into an optical information recording medium, a recording area of which is constructed with a plurality of zones, each being different in a sector number per one round of track. Information is recorded per one recording unit into the optical information recording medium and a verify control is conducted after the recording of information, wherein a number of recording units for conducting the verify control for each of the zones is changed upon basis of a number of sectors per one round of track and a number of sectors for turning back by the one round of track.

An information recording/reproducing apparatus for recording/reproducing information into and from an optical information recording medium, wherein the information of a plurality of sectors is recorded as one recording unit. A recoding area of the recording medium is constructed with a plurality of zones and each zone is different in a sector number per one round of track. A number of the recording units for conducting a verify control for each of the zones is changed on the basis of a number of sectors per one round of track and a number of sectors for turning back by the one round of track.

Information is recorded on a rewritable optical disk apparatus in accordance with the second generation 5 inch rewritable-type optical disks standards that provide for reusing once-defective user blocks. Such disks have a user data recording region, a replacement recording region and a replacement control information recording region in which a table of information linking defective blocks in the user data recording region with replacement blocks in the replacement recording region is stored. Continuity of the distribution of the replacement recording blocks is maintained by treatment of replacement blocks that become unnecessary. Unnecessary replacement blocks are ones that are not used for storing data because of the subsequent successful recording of data in once defective user blocks to which the replacement blocks were previously linked. Such unnecessary replacement blocks are treated as being defective if a following assigned replacement block exists in the replacement block recording region and they are used in links with other defective user blocks and assigned replacement blocks. In addition to maintaining continuous distribution of the replacement blocks as required by the second generation standard, fewer replacement blocks are required to be used.

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Fujisawa, Japan

Norimoto Ichikawa