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1. 发明专利

JP2002222108A DEVICE AND METHOD FOR GENERATING PARTIAL REPLICA 失效
公开(公告)号：JP2002222108A
公开(公告)日：2002-08-09
申请号：JP2001018803
申请日：2001-01-26
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： YAMASHITA MASAMI , SHIMAZAKI KOICHI , ITAYA TAKASHI , TAKEGUCHI SEIICHI
IPC分类号： G06F17/30 , G06F12/00
摘要： PROBLEM TO BE SOLVED: To generate a highly useable replica with a low storage device capacity and a low updating cost. SOLUTION: In a distributed database environment, data obtained by inquiry from clients 11 and 12 to servers 16 and 17 controlling the database are cached in a storage device as a partial replica 15 by means of the partial replica generating device. This partial replica generating device is provided with a processing means grouping inquiry groups consisting of a plurality of inquiry conditions, a processing means finding a set of inquiry conditions for every grouped inquiry condition, and a processing means sorting the inquiry conditions according to a condition overlapping range in the set of the inquiry conditions and setting the effectiveness degree of each of the sorted conditions according to its overlapping frequency. In generating the partial replica, the condition having the higher effectiveness degree is given higher priority to be used as the inquiry condition.

2. 发明专利

JPH09245473A SEMICONDUCTOR MEMORY 失效
公开(公告)号：JPH09245473A
公开(公告)日：1997-09-19
申请号：JP5053196
申请日：1996-03-07
申请人： HITACHI LTD , HITACHI VLSI ENG
发明人： YAMASHITA MASAMI , MOGI YASUO
IPC分类号： G11C11/401 , H01L21/822 , H01L21/8242 , H01L27/04 , H01L27/108
摘要： PROBLEM TO BE SOLVED: To provide a semiconductor memory which enables free selection of two each of column selection systems and data input systems. SOLUTION: An access to first memory blocks (MMO, MM1) is made possible by a specified state of a first column address strobe terminal (/LCAS) and the access to second memory blocks (MM2, MM3) is made possible by a specified state of a second column address strobe terminal (/UCAS). Input operations of first input buffers (DIB (0-3) and (DIB (8-11) are indicated by a specified state of a first light enable terminal (/LWE) and the input operations of second input buffers (DIB (4-7), DIB (12-15) is indicated by a specified state of a second light enable terminal (/UWE).

3. 发明专利

JPH0424781B2 失效
公开(公告)号：JPH0424781B2
公开(公告)日：1992-04-28
申请号：JP7670582
申请日：1982-05-10
申请人： HITACHI LTD
发明人： YAMASHITA MASAMI , FUJITA MASAHIKO , TAKEDA KATSUNOBU , KANEKO HISAO
IPC分类号： G11B21/02 , G11B5/55

4. 发明专利

JPS6349313B2 失效
公开(公告)号：JPS6349313B2
公开(公告)日：1988-10-04
申请号：JP10840482
申请日：1982-06-25
申请人： HITACHI LTD
发明人： YAMASHITA MASAMI , KANEKO HISAO , FUJITA MASAHIKO
IPC分类号： G11B21/08 , G11B5/55 , G11B21/02 , G11B27/10

5. 发明专利

JPS6231065A ELECTRONIC CAMERA SYSTEM 失效
公开(公告)号：JPS6231065A
公开(公告)日：1987-02-10
申请号：JP16981385
申请日：1985-08-02
申请人： HITACHI LTD
发明人： YAMASHITA MASAMI
IPC分类号： G11B33/10 , G11B19/12 , G11B23/30
摘要： PURPOSE:To enter a recordable state in a short time by detecting and writing the use states of all tracks in a storage means when a system is connected to a playback adapter and displaying the contents after the system is disconnected from the playback adapter. CONSTITUTION:A label is stuck in a disk discrimination area before, photography and recording operation to discriminate disks. Then, a discriminated disk is put in a case 1b and when the system is started through the operation box 4b of the playback adapter 4, an electric camera 1 reproduces all tracks of the disk 2 to detect unrecorded tracks and recorded tracks, thereby storing the track use state of each disk in a memory 12. Then, the disk is put in the case 1b or pressed against it and a display control switch 1e is pressed to discriminate the disk; and information on its track use state is read out of the memory and displayed on a display device 1d, so that it is decided whether the disk is usable or not.

6. 发明专利

JPS5873050A SPEED CONTROLLER FOR AUDIO TAPE RECORDER 失效
公开(公告)号：JPS5873050A
公开(公告)日：1983-05-02
申请号：JP17131981
申请日：1981-10-28
申请人： HITACHI LTD
发明人： YAMASHITA MASAMI , FUJITA NAOYA , FUJITA MASAHIKO , OKADA SHIGERU
IPC分类号： G11B15/52
摘要： PURPOSE:To surely control the speed of bidirection, by recording and immediately reading out one pulse signal, obtaining a series of pulses through the repetition of said recording with the output again, and clearning with DC the part already read. CONSTITUTION:A pulse is applied from an input terminal (not shown) to a recording head 2, in a control track 1e at the center of a tape running toward the direction A for recording. After a prescribed time, the pulse is reproduced 3, amplified 4, wave-shaped 5 and returned to the recording head 2 via a recording circuit 6, recorded again to form a series of pulse train. The period of pulse is proportional to the tape speed. A DC erase head 7 is provided at the down- stream of a reproducing head 3 to clear the pulse to prevent crosstalk from a control track to a head 9. A bias head 8 is provided at the upper-stream of the recording head 2 to invert the direction of magnetization of a region N to record signals from the recording head 2. Thus, a series of pulse train P is outputted 10 at forward/reverse to control the tape speed.

7. 发明专利

JPS62136981A PHASE CONTROL CIRCUIT FOR MOTOR 失效
公开(公告)号：JPS62136981A
公开(公告)日：1987-06-19
申请号：JP27689385
申请日：1985-12-11
申请人： HITACHI LTD
发明人： UEHARA MASAHIRO , TAKEDA KATSUNOBU , KANO KIYOSHI , YAMASHITA MASAMI
IPC分类号： G11B19/28 , G11B19/20 , H04N5/781
摘要： PURPOSE:To reduce a time between the start up time of a motor and a time possible to record by resetting the division timing of a phase difference detecting signal so as to equalize phase locked points just before switching a phase control from the control by a vertical synchronizing signal to the one by a horizontal synchronizing signal in a start up time. CONSTITUTION:After the phases of a reference position pulse signal PG and a vertical synchronizing signal VD are made approach in a certain range with the first phase control system, a system is switched to the second phase control system switching the side of the first phase comparison circuit 7 to that of the second phase comparison circuit 12. At such a case, since the phase locked points in the first phase control system and in the second phase control system are not necessarily coincided, the phase locked points in both systems are equalized by controlling the division timing of a division signal (HD/n) by a division circuit 10 with a reset circuit 16. Thereby, the motor is started up, and the time until when a state that a recording can be performed on a magnetic sheet is generated can be reduced, therefore, the recording can be performed in a requested recording time without delay.

8. 发明专利

JPS5911766A Linear pulse motor 失效
标题翻译：线性脉冲电机
公开(公告)号：JPS5911766A
公开(公告)日：1984-01-21
申请号：JP11975182
申请日：1982-07-12
申请人： Hitachi Ltd
发明人： KANEKO HISAO , YAMASHITA MASAMI
IPC分类号： H02K41/03
CPC分类号： H02K41/03
摘要： PURPOSE:To reduce an electric loss of a linear pulse motor by wiring a stationary unit over all stroke of a slider, and forming a coil, thereby reducing a load due to the bending resistance of the wirings. CONSTITUTION:A slider 11 which has projections 19 at the prescribed pitch is movably supported. Toothed parts 22-25 which has teeth at the prescribed pitch and are displaced at the positions of teeth mutually in the prescribed width are formed on a stationary unit 1. A magnet is secured to the lower end of the stationary unit 1. Coils 16, 17 are wound in several tens to several hundreds times all over the stroke of the slider 11 at the stationary unit 1. When a current is flowed to the coil 16, 17, the toothed parts 22-15 are excited, and the slider 11 is moved.
摘要翻译：目的：为了通过在滑块的所有行程上布线固定单元并形成线圈来减少线性脉冲电机的电损耗，从而减少由于布线的抗弯曲性引起的负载。构成：具有规定间距的突起部19的滑块11被可移动地支撑。在固定单元1上形成具有规定间距的齿并且在相互具有规定宽度的齿的位置移位的齿部22-25。固定单元1的下端固定有磁体。 17在固定单元1处的滑块11的整个行程上缠绕数十到几百次。当电流流到线圈16,17时，齿形部分22-15被激励，并且滑块11是移动。

9. 发明专利

JPS57152565A SPEED DETECTING DEVICE FOR MAGNETIC TAPE 失效
公开(公告)号：JPS57152565A
公开(公告)日：1982-09-20
申请号：JP3660681
申请日：1981-03-16
申请人： HITACHI LTD
发明人： FUJITA NAOYA , YAMASHITA MASAMI
IPC分类号： G11B15/52
摘要： PURPOSE:To reduce level variation in a titled device which detects tape speeds by recording and reproducing pulses on a magnetic tape, by adding a voltage having a varied amount which is reverse to the level variation of the reproduced signal, to the reproduced signal. CONSTITUTION:Pulses are recorded on a magnetic tape by means of a recording circuit 1 and recording head 2. An output obtained by intergrating the output of the recording circuit 1 at an integral network 6 is added to the output of a reproducing head 3 at an adder 7, and the output of the adder 7 is inputted to a reproducing circuit 4. The output of the reproducing circuit 4 is fetched from an output terminal 5 as a speed detecting signal and, at the same time, the speed detecting signal is immediately inputted to the recording circuit 1.

10. 发明专利

JPS61151885A DISK RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS61151885A
公开(公告)日：1986-07-10
申请号：JP27302584
申请日：1984-12-26
申请人： HITACHI LTD
发明人： YAMASHITA MASAMI , FUJITA MASAHIKO
IPC分类号： G11B27/10 , G11B21/08
摘要： PURPOSE:To obtain a head feed device of a simple constitution which can decide quickly the track position of a head, by using a counter memory which counts the track addresses and stores the count contents and detecting the revolving position of a feed screw at a position closest to the relevant track address. CONSTITUTION:A feed screw 6 is revolved with revolution of a step motor 3, and a head 8 is shifted together with a head carriage 7. Then a counter gear 12 is revolved and a drive ring 13 is revolved and a counter ring 2a of a counter dial 2 is revolved for replacement of the display of the number of recording tracks. A photosensor 14 detects a hole 5a for detection of revolving position of a follower gear 5 and then detects a revolving position of the gear per revolution. The track address data is set to a memory 21 and then read out by a primary control circuit 20 when a power supply switch is turned on. Then the position of the nearest revolving position detecting track is detected. Thus the head 8 is quickly positioned without feeding the head up to the most outer circumference track.

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