Patents by Inventor Hirofumi Saitoh

Hirofumi Saitoh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7995302
    Abstract: Embodiments of the present invention improve the safety against a fall of a disk drive device. In one embodiment, when an HDD has recognized detection result data of a fall sensor to indicate a fall, the HDD unloads a head slider from above a disk to a stand-by position. The HDD checks whether or not the detection result data of the fall sensor indicates a fall on the occasion of a seek start. If the data indicates a fall, the controller unloads an actuator. The HDD issues a seek fake error on the occasion of a seek completion. On the occasion of a re-seek start in the error recovery process, the HDD conducts a fall check referring to the detection result data.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: August 9, 2011
    Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
    Inventors: Sayaka Nojiri, Shinji Matsushita, Naoya Tsurusaki, Hirofumi Saitoh
  • Patent number: 7899216
    Abstract: In order to acquire a suitable fingerprint image by correcting an elongated fingerprint image, a line sensor acquires fingerprint image as a plurality of line-shaped images. A computation unit computes a similarity value by use of an evaluation function for evaluating the degree of similarity between the line-shaped images. The similarity value represents the degree of similarity between a first line-shaped image and a second line-shaped image which serve as a similarity evaluation target and are included in the plurality of the line-shaped image. A compression unit compresses the first line-shaped image and the second line-shaped image when the similarity value is equal to or larger than a predetermined threshold value to generate a new line-shaped image. A generation unit generates the entire fingerprint image by combining the new line-shaped image with the other line-shaped images.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: March 1, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Keisuke Watanabe, Tatsuya Masuda, Tatsushi Ohyama, Hirofumi Saitoh, Yasunari Takasaki, Masaya Okumura
  • Patent number: 7664884
    Abstract: Embodiments of the present invention provide a media drive that is intended for reduction in power consumption required for serial communications to/from a host, and a power saving method thereof. In one embodiment, a HDD includes: a cache; a host interface for transferring, to a host, transfer data read out from the cache; a host interface manager that controls the execution of commands so as to generate a transfer unnecessary period during which a command and transfer data need not be exchanged with the host; and a MPU that brings a serial communication part of the host interface into a power save mode during the transfer unnecessary period. The host interface manager determines the optimum data transfer timing of transferring data from the cache to the host on the basis of a transfer rate at which data is transferred to the host, and a read rate at which data is read out from a disk into the cache.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: February 16, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Atsushi Kanamaru, Tadahisa Kawa, Hiromi Kobayashi, Hirofumi Saitoh
  • Patent number: 7613525
    Abstract: Embodiments of the invention provide a disk device and a method of controlling the device which is capable of suppressing peak current, even for serial communication, that is required when initiating rotation of a spindle motor down to a level equivalent to that of parallel communication, without prolonging elapsed time before reaching the steady rotation speed. In one embodiment, an HDD includes a serial communication circuit which executes serial communication with a host, an SPM which rotates a disk, an HDC/MPU which controls the SPM and the serial communication circuit. The HDC/MPU, after shutting down the serial communication circuit once, starts up the serial communication circuit again when rotation speed of the SPM reached the specified standard value, and establishes serial communication with the host by means of the serial communication circuit.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: November 3, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kenji Ogasawara, Hirofumi Saitoh
  • Publication number: 20090268334
    Abstract: Embodiments of the present invention improve the safety against a fall of a disk drive device. In one embodiment, when an HDD has recognized detection result data of a fall sensor to indicate a fall, the HDD unloads a head slider from above a disk to a stand-by position. The HDD checks whether or not the detection result data of the fall sensor indicates a fall on the occasion of a seek start. If the data indicates a fall, the controller unloads an actuator. The HDD issues a seek fake error on the occasion of a seek completion. On the occasion of a re-seek start in the error recovery process, the HDD conducts a fall check referring to the detection result data.
    Type: Application
    Filed: April 23, 2009
    Publication date: October 29, 2009
    Inventors: Sayaka Nojiri, Shinji Matsushita, Naoya Tsurusaki, Hirofumi Saitoh
  • Patent number: 7490259
    Abstract: Embodiments of the invention increase the probability of error recovery in error recovery processing. When a reset command is received during an error recovery procedure (ERP), a timer is started in response to the reset command. From the time at which the reset command has been received until the predetermined time prescribed by the timer passes, the ERP step is continued. After the timer expires, the ERP processing stops on the completion of an ERP step M. Additionally, a HDD returns to a host a reset ready, which represents the completion of the reset. Since the ERP is continued even after the reset command is received, it is possible to increase the probability of error recovery.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: February 10, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventor: Hirofumi Saitoh
  • Patent number: 7475265
    Abstract: Embodiments of the invention reduce consumption power of a data storage device. In one embodiment, an HDD according to the embodiment selectively switches a serial interface among other circuits to a power-save mode. The HDD receives a command from a host, and, in a command execution sequence thereof, sets and keeps the serial interface in the power-save mode for at least a partial period of time during which no sending and receiving of data resulting from serial data communication with the host exists. Further, in responding to completion of execution of the command, the HDD switches the serial interface to the power-save mode.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: January 6, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiroshi Oshikawa, Hirofumi Saitoh
  • Patent number: 7373460
    Abstract: Embodiments of the present invention provide a media drive capable of improving command processing performance by, when a plurality of commands is queued, shortening seek time and rotational latency, and also effectively making use of the shortened period of time. In one embodiment, a HDD includes a queue capable of storing a plurality of commands, and a queue manager for optimizing the execution order of the plurality of commands on the basis of whether or not the execution of each command requires access to a medium. The queue manager determines the execution order so that medium access processing of accessing a disk for execution, and data transfer processing of transferring data between the HDD and a host, are executed in parallel with each other. For example, read processing and transfer processing are executed in parallel with each other. The read processing is adaptive to read out a read command, data of which does not exist in the cache, from the disk into the cache.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: May 13, 2008
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiromi Kobayashi, Hirofumi Saitoh, Takahiro Saito, Tadahisa Kawa, Atsushi Kanamaru
  • Publication number: 20070036400
    Abstract: An input unit accepts a fingerprint image of a user. A pre-extraction and categorization unit generates pre-extracted data from the fingerprint image and uses the data to categorize the input fingerprint image into one of multiple groups. A feature extraction unit extracts fingerprint feature data from the fingerprint image by processing methods defined for the respective groups. A feature data matching processing unit matches the fingerprint feature data against fingerprint authentication data registered in a fingerprint authentication database by processing methods defined for the respective groups. An integrated authentication unit authenticates a user with the input fingerprint image based upon a result of matching.
    Type: Application
    Filed: March 28, 2006
    Publication date: February 15, 2007
    Inventors: Keisuke Watanabe, Hirofumi Saitoh
  • Publication number: 20060239514
    Abstract: In order to acquire a suitable fingerprint image by correcting an elongated fingerprint image, a line sensor acquires fingerprint image as a plurality of line-shaped images. A computation unit computes a similarity value by use of an evaluation function for evaluating the degree of similarity between the line-shaped images. The similarity value represents the degree of similarity between a first line-shaped image and a second line-shaped image which serve as a similarity evaluation target and are included in the plurality of the line-shaped image. A compression unit compresses the first line-shaped image and the second line-shaped image when the similarity value is equal to or larger than a predetermined threshold value to generate a new line-shaped image. A generation unit generates the entire fingerprint image by combining the new line-shaped image with the other line-shaped images.
    Type: Application
    Filed: March 17, 2006
    Publication date: October 26, 2006
    Inventors: Keisuke Watanabe, Tatsuya Masuda, Tatsushi Ohyama, Hirofumi Saitoh, Yasunari Takasaki, Masaya Okumura
  • Publication number: 20060224900
    Abstract: A data holding unit holds data sets each composed of a fingerprint image and recording setting data associated with the fingerprint image. A fingerprint image acquisition unit acquires a fingerprint image newly from a user. A similarity value calculation unit compares the fingerprint image newly acquired from the user and the fingerprint image held in the data holding unit, and indicates a degree of similarity therebetween as a similarity value by using a similarity evaluation function for indicating a degree of similarity between a plurality of types of fingerprint images. A load data selection unit reads recording setting data corresponding to a fingerprint image having a similarity value reaching or exceeding a predetermined value if the fingerprint image is held in the data holding unit, and reads certain data prepared in advance if not.
    Type: Application
    Filed: March 30, 2006
    Publication date: October 5, 2006
    Inventors: Keisuke Watanabe, Tatsushi Ohyama, Hirofumi Saitoh, Masaya Okumura
  • Patent number: 7085087
    Abstract: To avoid degradation of performance of a storage apparatus even when access biased to writing or reading of data is performed in a buffer memory that adopts a dual ring buffer system as a data structure. A sector buffer for caching an access request is provided in a DRAM of the storage apparatus. The sector buffer has a first ring buffer (BUF_W) that temporarily holds an external write request for a recording medium in advance of its process to the recording medium, and a second ring buffer (BUF_R) that retains data read from the recording medium according to an external read request for the recording medium. An MPU of the storage apparatus shifts a BPAGE of the BUF_R or BUF_W according to external access patterns to the recording medium to thereby change the buffer sizes of the BUF_R and BUF_W.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: August 1, 2006
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Ryoji Fukuhisa, Hirofumi Saitoh, Takahiro Saito, Shuji Yamada
  • Publication number: 20060165264
    Abstract: In a verification apparatus, an image pickup unit picks up an image of an object to be verified. A calculation unit calculates, from the captured object image, a characteristic quantity that characterizes a direction of lines within the object image along a first direction or a characteristic quantity that characterizes the object image as a single physical quantity. Then a region from which data are to be acquired is set by referring to a characteristic quantity of the object image and, from this region, a characteristic quantity that characterizes a direction of lines within the object image along a second direction different from the second direction or a characteristic quantity that characterizes the object image as a single physical quantity is calculated. A verification unit at least verifies the characteristic quantity of the object image against that of a reference image along the second direction.
    Type: Application
    Filed: January 26, 2006
    Publication date: July 27, 2006
    Inventors: Hirofumi Saitoh, Tatsushi Ohyama
  • Publication number: 20060129703
    Abstract: Embodiments of the invention realize a power-save mode which prevents reduction in performance of a data storage device. The HDD as an embodiment of the present invention, upon receiving a request for switching to a power-save mode (PMREQ) from the host, judges whether the serial interface should be switched to the power-save mode based on the execution status of the command. When the HDD has determined not to switch the serial interface to the power-save mode, the HDD transmits a negative response (PMNACK) to the host and keep the serial interface in the active mode. By denying switching to a power-save mode when data transfer is executed within a short period of time, etc., it is possible to prevent reduction in performance of the data storage device.
    Type: Application
    Filed: November 23, 2005
    Publication date: June 15, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B. V.
    Inventors: Hiroshi Oshikawa, Daisuke Kawamata, Hirofumi Saitoh, Tsuguaki Kowa
  • Publication number: 20060106980
    Abstract: Embodiments of the present invention provide a media drive capable of improving command processing performance by, when a plurality of commands is queued, shortening seek time and rotational latency, and also effectively making use of the shortened period of time. In one embodiment, a HDD includes a queue capable of storing a plurality of commands, and a queue manager for optimizing the execution order of the plurality of commands on the basis of whether or not the execution of each command requires access to a medium. The queue manager determines the execution order so that medium access processing of accessing a disk for execution, and data transfer processing of transferring data between the HDD and a host, are executed in parallel with each other. For example, read processing and transfer processing are executed in parallel with each other. The read processing is adaptive to read out a read command, data of which does not exist in the cache, from the disk into the cache.
    Type: Application
    Filed: November 10, 2005
    Publication date: May 18, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiromi Kobayashi, Hirofumi Saitoh, Takahiro Saito, Tadahisa Kawa, Atsushi Kanamaru
  • Publication number: 20060101174
    Abstract: Embodiments of the present invention provide a media drive that is intended for reduction in power consumption required for serial communications to/from a host, and a power saving method thereof. In one embodiment, a HDD includes: a cache; a host interface for transferring, to a host, transfer data read out from the cache; a host interface manager that controls the execution of commands so as to generate a transfer unnecessary period during which a command and transfer data need not be exchanged with the host; and a MPU that brings a serial communication part of the host interface into a power save mode during the transfer unnecessary period. The host interface manager determines the optimum data transfer timing of transferring data from the cache to the host on the basis of a transfer rate at which data is transferred to the host, and a read rate at which data is read out from a disk into the cache.
    Type: Application
    Filed: November 4, 2005
    Publication date: May 11, 2006
    Applicant: Hitachi Global Storage Technologies
    Inventors: Atsushi Kanamaru, Tadahisa Kawa, Hiromi Kobayashi, Hirofumi Saitoh
  • Publication number: 20060080483
    Abstract: Embodiments of the invention provide a disk device and a method of controlling the device which is capable of suppressing peak current, even for serial communication, that is required when initiating rotation of a spindle motor down to a level equivalent to that of parallel communication, without prolonging elapsed time before reaching the steady rotation speed. In one embodiment, an HDD includes a serial communication circuit which executes serial communication with a host, an SPM which rotates a disk, an HDC/MPU which controls the SPM and the serial communication circuit. The HDC/MPU, after shutting down the serial communication circuit once, starts up the serial communication circuit again when rotation speed of the SPM reached the specified standard value, and establishes serial communication with the host by means of the serial communication circuit.
    Type: Application
    Filed: September 19, 2005
    Publication date: April 13, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kenji Ogasawara, Hirofumi Saitoh
  • Publication number: 20060069932
    Abstract: Embodiments of the invention reduce consumption power of a data storage device. In one embodiment, an HDD according to the embodiment selectively switches a serial interface among other circuits to a power-save mode. The HDD receives a command from a host, and, in a command execution sequence thereof, sets and keeps the serial interface in the power-save mode for at least a partial period of time during which no sending and receiving of data resulting from serial data communication with the host exists. Further, in responding to completion of execution of the command, the HDD switches the serial interface to the power-save mode.
    Type: Application
    Filed: September 14, 2005
    Publication date: March 30, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiroshi Oshikawa, Hirofumi Saitoh
  • Publication number: 20060069816
    Abstract: Embodiments of the invention improve power management in a data storage device which executes serial data communication with a host. In one embodiment, a HDD executes a reset process from a sleep mode (clock inactive) as being triggered by a control signal that is not based on a clock from the host. Even during a period in which the system clock is suspended, the HDD is able to receive the control signal from the host. In responding to the control signal and by activating a circuit required for serial data transmission, the HDD is enabled to receive a software reset command from the host via a serial data transmission circuit. With such an arrangement, the HDD can receive the software reset command from the host, and in responding to the reception of the command, the HDD can be reset to the normal active mode.
    Type: Application
    Filed: September 19, 2005
    Publication date: March 30, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiroshi Oshikawa, Hirofumi Saitoh
  • Publication number: 20060045315
    Abstract: In a biological information acquisition apparatus, a biological acquisition unit acquires biological information. A sensitivity control unit varies sensitivity, with time, at which said biological acquires the biological information in a sensing period during which to acquire the biological information. A biological information recording unit records the biological information acquired respectively in accordance with a plurality of stages of sensitivity. The sensitivity control unit varies the sensitivity according a predetermined change pattern.
    Type: Application
    Filed: August 15, 2005
    Publication date: March 2, 2006
    Inventors: Hirofumi Saitoh, Tatsushi Ohyama