Patents Assigned to Hitachi Computer Peripherals Co.
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Patent number: 8032712Abstract: There is provided a storage system accessed by a host computer, comprising: an interface coupled to the host computer; a processor coupled the interface; a memory coupled to the processor; and a storage device for storing the data. The storage device comprises a first storage device in which the stored data is accessed sequentially from a beginning, and a second storage device in which the stored data can be accessed at random. The data stored in the first storage device is replicated to the second storage device, and the replicated data is accessed by the host computer. The processor receives a candidate of the data including a priority of the data from the host computer, and replicates the data included in the candidate of the data, and stored in the first storage device to the second storage device in accordance with the priority before reception of an access request.Type: GrantFiled: April 18, 2008Date of Patent: October 4, 2011Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.Inventors: Tomonori Murayama, Yoichi Mizuno
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Publication number: 20110227546Abstract: To eliminate the problem that a magnetic deflection is caused in a transformer even when a coupled inductor converter is in a stationary operation state, provided is a DC-DC converter including a first series circuit portion formed by a first switching transistor, a first capacitor, a first inductor, and a second capacitor which are connected to a DC power in series in this order, and a second series circuit portion formed by a second switching transistor and a second inductor which are connected in series in this order, the second series circuit portion is connected in parallel to the first capacitor and the first inductor, and the first inductor and the second inductor constitute a coupled inductor having a plurality of windings and a common magnetic core.Type: ApplicationFiled: October 28, 2009Publication date: September 22, 2011Applicants: OITA University, Hitachi Computer Peripherals Co., Ltd.Inventors: Kimihiro Nishijima, Kosuke Abe
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Patent number: 7987328Abstract: In a virtual disk library device access of data stored in a tape can be conducted at a high speed with a high-speed archiving process from a disk to the tape in units of LUs maintained. The efficiency of update of the data stored in the tape can be improved. In this system, when the data stored in the tape is to be accessed with a high-speed archiving process in units of LUs from the disk to the tape maintained, a disk staging process is performed in the unit of a page that is smaller than the unit of an LU, and accordingly, high-speed access can be implemented. In addition, when an update process for the data (LU) stored in the tape is performed, the host can be responded by only staging an update target page of the LU, and a prior disk staging process is performed for the remaining pages of the LU in the background. Accordingly, when the data is re-stored in the tape, immediately storing the data in the tape can be performed without performing a staging process.Type: GrantFiled: December 10, 2008Date of Patent: July 26, 2011Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.Inventors: Tomonori Murayama, Yoichi Mizuno
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Patent number: 7972285Abstract: A motion sensor for measuring motion information of a subject comprises a coil substrate having transmitting or receiving coils piled one on top of another and a holder in which the coil substrate is mounted. Formed on the holder are curved surfaces to which an adhesive sheet is stuck and at which the holder is attached to a nail of a subject via the adhesive sheet. Further, there is provided a casing where first and second containing space are formed to contain measurement instruments including an adhesive member where a plurality of the adhesive sheets are laid one on top of another, the motion sensor, and the like.Type: GrantFiled: February 8, 2008Date of Patent: July 5, 2011Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Tsuyoshi Miyashita, Akihiko Kandori, Mitsuru Onuma, Norihiko Matsumoto, Kouichi Ishizuka, Norihiko Adachi, Atsushi Ninomiya, Yoshimi Kasai
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Patent number: 7958326Abstract: The correspondence between a plurality of virtual storage positions in a virtual volume for logically holding a snapshot image of a main volume in which data elements transmitted from a higher-level device are written and a plurality of address information elements indicating a plurality of actual storage positions of a plurality of data elements constituting the snapshot image is managed. In the initial backup, all the data elements stored in all the actual storage positions indicated by a plurality of address information elements are backed up, then storage positions where a difference has occurred between the virtual volume and the backup destination storage device is managed, and in the next and subsequent backups, data elements on the storage positions specified from the address information elements corresponding to the differentially managed storage positions are backed up.Type: GrantFiled: January 25, 2008Date of Patent: June 7, 2011Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.Inventors: Takashi Amano, Yoichi Mizuno
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Patent number: 7923980Abstract: In a digital controlled power supply including a digital controller for generating a PWM signal which is used to turn on and off a switching element to obtain an output voltage for a load based on an input voltage, the digital controller includes an AD converter for receiving an analog output current from the power supply and converting the current into a digital value to produce a digital output current value, an arithmetic processing unit for conducting an arithmetic operation of a pulse width for each period of a sampling frequency of the AD converter or a frequency of carrier wave as a criterion to obtain the PWM signal, and a frequency controller for variably controlling the frequency of carrier wave and the sampling frequency on the basis of the digital output current value from the AD converter.Type: GrantFiled: October 16, 2008Date of Patent: April 12, 2011Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Fumikazu Takahashi, Masahiro Hamaogi
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Patent number: 7911810Abstract: A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.Type: GrantFiled: October 1, 2010Date of Patent: March 22, 2011Assignee: Hitachi Computer Peripherals, Co., Ltd.Inventors: Takae Shimada, Yoshihide Takahashi, Kimiaki Taniguchi, Hiroyuki Shoji
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Patent number: 7880440Abstract: To provide a smaller and more efficient switching power supply, the switching power supply includes: a high frequency transformer; a primary side switching circuit adapted to switch a current flowing through a primary winding of the high frequency transformer to thereby generate predetermined voltages in a secondary winding and an auxiliary winding of the high frequency transformer; a secondary side rectifier adapted to rectify a voltage generated in the secondary winding to supply the rectified voltage to a load; a charging circuit adapted to rectify a current flowing through the auxiliary winding and to switch the rectified current to thereby charge a secondary battery at a constant current; and a switch, provided between the secondary battery and the load, which supplies, when the voltage supplied to the load is interrupted, the voltage of the secondary battery to the load without going through the high frequency transformer.Type: GrantFiled: January 18, 2008Date of Patent: February 1, 2011Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Fumikazu Takahashi, Akihiko Kanouda, Masahiro Hamaogi, Yoshihide Takahashi
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Patent number: 7873600Abstract: A storage control device uses write management information that manages locations of the occurrence of writing in one or more first storage devices in order to specify one or more locations where writing has occurred, and backs up one or more data elements stored in one or more specified locations to a second storage device. In order to perform a restore operation, write management information at the time of a backup is stored, and data elements stored in the second storage device are restored to one or more locations specified from the write management information at that time of backup, or to one or more new locations specified from new write management information indicating one or more new locations corresponding to the one or more locations.Type: GrantFiled: January 3, 2008Date of Patent: January 18, 2011Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.Inventors: Tomonori Murayama, Yoichi Mizuno
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Patent number: 7848118Abstract: A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.Type: GrantFiled: August 18, 2008Date of Patent: December 7, 2010Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Takae Shimada, Yoshihide Takahashi, Kimiaki Taniguchi, Hiroyuki Shoji
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Patent number: 7840840Abstract: A DC backup power supply system having a plurality of loads to which AC from a commercial power source is supplied, and DC power storage means for supplying DC power to the plurality of the loads at the time of a power outage of the commercial power source, said DC backup power supply system including: a control circuit having a first DC backup output for supplying a power from the DC power storage means to the plurality of the loads, including a specific load, only during the power outage of the commercial power source, and a second DC backup output for continuously supplying a power from the DC power storage means to the specific load regardless of the power outage of the commercial power source or sound operation thereof, the control circuit supplying the respective powers from the same DC power storage means to the first and second DC backup outputs.Type: GrantFiled: July 28, 2008Date of Patent: November 23, 2010Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Fumikazu Takahashi, Minehiro Nemoto, Isao Nemoto, legal representative, Akihiko Kanouda, Masahiro Hamaogi, Yoshihide Takahashi
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Patent number: 7812575Abstract: A bidirectional DC-DC converter 10 has smoothing capacitors Cs1 and Cs2, a smoothing reactor Ls, resonant reactors Lr1 and Lr2, and a resonant capacitor Cr, as well as insulated gate bipolar transistors (IGBTs) Q1, Q2, and Q3 to which buffer capacitors C1, C2, and C3 are connected in parallel and diodes D1, D2, and D3 are connected in a back-to-back configuration. After part of the energy stored in the smoothing reactor Ls and/or resonant reactors Lr1 and Lr2 draws charges in the buffer capacitor C3 and is stored in the resonant capacitor Cr, the energy is stored in the resonant reactors Lr1 and Lr2. The energy is used to draw charges in the buffer capacitors C1 and C2, achieving soft switching of IGBTs Q1, Q2, and Q3.Type: GrantFiled: January 29, 2007Date of Patent: October 12, 2010Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Takae Shimada, Hiroyuki Shoji, Masahiro Hamaogi, Kimiaki Taniguchi
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Patent number: 7788229Abstract: An LU management table 61 that associates and stores the LU# of the P-Vol 10p and the LU# of the S-Vol 10s is provided. The CPU 53 specifies the LU# of the S-Vol 10s constituting the save source of the data with respect to the magnetic tape cartridge 74, acquires the LU# of the P-Vol 10p associated with the specified LU# from the LU management table 61, reads the saved data from the magnetic tape cartridge 74 storing the data by means of the magnetic tape drive 71, and stores the data read from the magnetic tape cartridge 74 to the P-Vol 10p with the acquired LU#. As a result, the data can be restored easily and properly to the P-Vol 10p.Type: GrantFiled: February 5, 2008Date of Patent: August 31, 2010Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., LtdInventor: Kazuhiro Usami
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Patent number: 7748050Abstract: An optical disc manufacturing apparatus (46) recording a BCA code constituted by plural marks and including a secret code which is modulated in a range capable of recognizing a position in a radial direction of an optical disc and/or a position in a track direction of the plural marks as the BCA code, a BCA history database (44) storing a history including a correspondence between the BCA code of an optical disc (1a) recording the BCA code and the secret code, and a management center (30) reading the BCA code and the secret code recorded on the optical disc so as to compare both on the basis of input of the correspondence between the BCA code and the secret code stored in the BCA history database (44) are employed, whereby an illegally manufactured optical disc (1z) can be easily found by inspecting the recorded BCA code and secret code.Type: GrantFiled: February 16, 2005Date of Patent: June 29, 2010Assignees: Memory-Tech Corporation, Hitachi Computer Peripherals Co., Ltd.Inventors: Masato Otsuka, Eiji Sahota, Yoshiharu Tami
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Patent number: 7705562Abstract: An object of the invention is to provide a small and low-cost switching power supply unit with a backup function in which a proper circuit construction can be selected by simple method when it is necessary to compensate for the instantaneous drop or power failure and a disk array system having the switching power supply unit. To accomplish the object, a backup unit which can insert and pull out its hot line into a switching power supply unit casing and has a secondary battery and its state monitoring/control unit is built in the unit, and proper charge/discharge management of the secondary battery can be made. When the backup unit is unnecessary, a backup unit formed by a plurality of capacitors whose hot lines can be similarly inserted and pulled out can be built in an enclosing space of the backup unit.Type: GrantFiled: August 30, 2006Date of Patent: April 27, 2010Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Fumikazu Takahashi, Akihiko Kanouda, Kuniyoshi Watanabe, Masahiro Hamaogi, Yoshihide Takahashi
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Patent number: 7707373Abstract: Differential management information that is information representing the difference between a logical volume and a sequential device group after a full backup is updated in response to an update of the logical volume. Partial data that are data representing the difference between the logical volume and sequential device group are specified by using the updated differential management information, information necessary for restoration that is necessary to restore the data group located in the updated logical volume by using the partial data is recorded in the sequential device group, and the partial data are backed up from the updated logical volume into the sequential device group.Type: GrantFiled: November 13, 2006Date of Patent: April 27, 2010Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., Ltd.Inventors: Tomonori Murayama, Yoichi Mizuno
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Patent number: 7694092Abstract: One or more random access-type storage devices comprise a volume group and a journal volume. The volume group contains a volume pair configured from a primary volume and a secondary volume. Whenever data is received from a host device, this received data is written in the primary volume, a journal containing the write sequence of the data and the data is produced, and the journal is written in a journal volume. A plurality of journals accumulated in a journal volume are written in a sequential access-type storage device. Based on the write sequence recorded in each of the plurality of journals recorded in the sequential access-type storage device, the data of the journals is restored to the primary volume for storing the data and to a secondary volume from which the volume pair is configured.Type: GrantFiled: November 13, 2006Date of Patent: April 6, 2010Assignees: Hitachi, Ltd., Hitachi Computer Peripheral Co., Ltd.Inventor: Yoichi Mizuno
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Patent number: 7683597Abstract: To provide a power supply apparatus having high control resolution of an output power. A PWM signal generating circuit includes: a non-inverting element 31, and an inverting element 32; and further includes a counter 11 for performing count operation in response to rising of a clock signal, a counter 12 for performing count operation in response to falling of the clock signal, comparison circuits 21, 22, and a multiplexer 20. These circuit elements are controlled by PWM control means 10. As another circuit element, the PWM signal generating circuit includes a logical sum element 33. The PWM signal generating circuit serves to arbitrarily change both period and logic “H” time of a PWM signal to be outputted at a time interval which is one half of the clock period. Thus, there is provided a power supply apparatus in which resolution of a PWM signal has been improved within a broad duty range, and fine control of an output power has been performed within a broad output power range.Type: GrantFiled: October 2, 2007Date of Patent: March 23, 2010Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Takae Shimada, Fumikazu Takahashi, Hiroyuki Shoji, Yoshihide Takahashi, Wataru Mochizuki
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Patent number: 7589436Abstract: A backup power supply is so constructed that it is provided with multiple DC backup power supplies 111 to 11N, each containing nickel-metal hydride battery, stored upright on the bottom of the disk array unit 100; cooled by cooling air through the vents 1011 for ventilation from the bottom to the top; and connected with the output of the AC/DC converters 121, 122 with the backboard 151. Very compact disk array unit with an uninterruptible power supplying function can be realized.Type: GrantFiled: February 8, 2005Date of Patent: September 15, 2009Assignee: Hitachi Computer Peripherals Co., Ltd.Inventors: Fumikazu Takahashi, Akihiko Kanouda, Masahiro Hamaogi, Yoshihide Takahashi
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Patent number: 7542396Abstract: To achieve stable, high capacity, high speed recording. Of two light beams emitted from a light irradiation means, one or two beams are made pass through an optical path changeable member whereof at least one of the thickness and refractive index changes continuously or in two or more steps immediately after emission from the light irradiation means, so that a difference is introduced into the optical path length of the two beams, and the focusing point of one beam is made to vary to coincide with a position in the recording layer used for playback or recording. Another light beam is used for servo. Converging of light during recording or read of a multilayer recording medium is performed with higher precision than in the prior art, so higher density, higher capacity recording/playback can be performed.Type: GrantFiled: August 24, 2005Date of Patent: June 2, 2009Assignees: Hitachi, Ltd., Hitachi Computer Peripherals Co., LtdInventors: Motoyasu Terao, Toshimasa Kamisada, Shinichi Nakatsuka, Takeshi Shimano, Hitoshi Ishii, Kazuhiro Soga, Yoshiaki Ogino