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1. 发明专利

JP2001166888A DATA STORAGE SYSTEM, DATA STORAGE METHOD, AND RECORDING MEDIUM ON WHICH PROGRAM OF DATA STORAGE METHOD IS RECORDED 失效
公开(公告)号：JP2001166888A
公开(公告)日：2001-06-22
申请号：JP35326899
申请日：1999-12-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KINOSHITA SHIGECHIKA , KATO KIKUJI
IPC分类号： G06F3/06
摘要： PROBLEM TO BE SOLVED: To realize data transfer at a high speed and with high reliability regarding a data storage system, a data storage method and a recording medium on which a program of the method is recorded. SOLUTION: D is calculated (S2), whether D is an integer or not is judged (S3) and when it is an integer, stripe depth is defined as D (S6). When D is not an integer, the minimum integer to exceed D is defined as the stripe depth (S4). NULL data is added to data and the number of blocks to be written by every library storage device is equalized (S5). Parity is calculated and a redundant group is constructed (S7). A recording medium to constitute a logical medium in which a free capacity required for writing data exists is loaded in a drive device (S8). Each data block is written in the loaded drive device (S9). A number of a logical storage medium and the total space of the data used for writing are stored (S10).

2. 发明专利

JPH07192374A LIBRARY DEVICE 失效
公开(公告)号：JPH07192374A
公开(公告)日：1995-07-28
申请号：JP33548593
申请日：1993-12-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIZUKAMI MAKOTO , IWAZU SHIGETARO , IZAWA NOBUYOSHI , KATO KIKUJI
IPC分类号： G06F3/06 , G11B15/68 , G11B17/22
摘要： PURPOSE:To obtain a library device which can change recording media in an extremely short time. CONSTITUTION:When cartridges 1 are changed, the cartridge 1 taken out of a drive part 2 is stored in the free storage part 3a' of the (n)th group Gn which the new cartridge 1 belongs to, and then the new cartridge 1 is taken out of the (n)th group Gn and loaded in the drive part 2. Consequently, the range of the movement of the cartridge 1 which becomes unnecessary in the drive part 2 to the storage position of the new cartridge 1 after the unnecessary cartridge is put back in storage 3 is always in the same group and the mean movement distance of a hand part 4 is greatly shortened.

3. 发明专利

JPH07141679A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH07141679A
公开(公告)日：1995-06-02
申请号：JP28677193
申请日：1993-11-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TATEMICHI HIDETOSHI , KATO KIKUJI , YAMAMOTO MANABU
IPC分类号： G11B7/135
摘要： PURPOSE:To provide the optical information recording and reproducing device with which high-density recording exceeding the limit of former information recording density is possible. CONSTITUTION:A laser beam 21 emitted from a laser beam source 20 is diffracted to plural different directions by an optical diffraction element 100 and after the plural diffracted light beams emitted from the optical diffraction element 100 are collimated to plural beams by a collimating lens 12, the parallel beams are transmitted through a beam splitter 3 and the interference thereof is caused in the same position on a rotary disk medium 6 by an objective lens 5. As a result, a narrow isolated intensity peak is formed by the interference (multiwave interference) in a condensing position and a pit corresponding to one bit is formed by this isolated intensity peak. Consequently, the recording of the narrow pits exceeding the diffraction threshold in the case of condensing of the laser beam effectively only by the objective lens is possible and the higher density of the information recording density on the optical recording medium is easily attained.

4. 发明专利

JPH0749647A OPTICAL INFORMATION RECORDER 失效
公开(公告)号：JPH0749647A
公开(公告)日：1995-02-21
申请号：JP19722493
申请日：1993-08-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TATEMICHI HIDETOSHI , KATO KIKUJI , YAMAMOTO MANABU
IPC分类号： G03H1/04
摘要： PURPOSE:To provide an optical information recorder capable of rapidly recording the hologram of two-dimensional information with high density on a still recording medium. CONSTITUTION:An ultrasonic standing wave is generated in an ultrasonic light deflector 2', and an incident laser beam from a laser light source 1 is diffracted by the ultrasonic standing wave, and a zero-order transmission beam and a first-order diffraction beam are obtained. The first-order diffraction beam irradiates the still recording medium 9' through a collimating lens 4 and an objective lens 5 to make a reference beam 8, and the zero-order transmission beam irradiates the recording medium 9' through the collimating lens 4, a space light modulator 6 and the objective lens 5 to make a signal beam 7. In the first-order diffraction beam diffracted and generated by the ultrasonic standing wave, whose doppler shift is canceled, and the same frequency component as the frequency of the incident beam exists even after being diffracted. Thus, though the diffracted beam with the same frequency component as the incident beam is interferred with the zero-order transmission beam, interference fringes become no moving interference fringes but become a spatial standing wave, and hologram recording is performed on the recording medium 9'.

5. 发明专利

JPH06231472A MULTI-BEAM POSITIONING CONTROLLER 失效
公开(公告)号：JPH06231472A
公开(公告)日：1994-08-19
申请号：JP1546993
申请日：1993-02-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIZUKAMI MAKOTO , KATO KIKUJI
IPC分类号： G11B7/00 , G11B7/005 , G11B7/085 , G11B7/09 , G11B7/14
摘要： PURPOSE:To improve the total positioning accuracy of respective light beams by offsetting a translation error signal so as to make the absolute values of selected position error signals equal to each other and their codes different. CONSTITUTION:The amount of geometric off-track becomes maximum on a #2 light beam nearest the center of a beam row and the light beam having the amount of off-track larger than those of two light beams at both ends of the beam row is selected on the basis of the #2 light beam. The position error signal thus selected becomes a second position error signal and further an offset signal is generated by halving the difference value. The offset signal is added to the sum signal of the first and a third position error signals. Then, the amount of off-track of the light beam having the larger offset among #1 and #3 light beams at both ends of the beam row on the basis of the #2 beam coincides with that of the #2 light beam. Since the beam row is controlled so as to reverse the direction of offsets, the off-track is eliminated positioning accuracy is improved.

6. 发明专利

JPH06187652A OPTICAL SPOT TRAIN REVOLVING DEVICE FOR MULTIBEAM OPTICAL DISK DEVICE 失效
公开(公告)号：JPH06187652A
公开(公告)日：1994-07-08
申请号：JP33619292
申请日：1992-12-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATO KIKUJI , MIZUKAMI MAKOTO , KAWAI YASUSHI
IPC分类号： G11B7/09 , G11B7/14
摘要： PURPOSE:To improve the vibrating characteristic by securing an approximately symmetrical shape of a movable part to a supporting center line for improvement of the tracking accuracy of the multibeams and by minimizing the forced external force caused by the imbalance in order to secure the approximate coincidence between the centroid of the movable part and the supporting center. CONSTITUTION:The Dove prism 24, i.e., an optical parts of a movable part is fixed by adhering in an approximately cylindrical holder 25. The holder 25 is fixed in a housing 27 by a plate spring 26 consisting of an inner circumference fixing part 26a, plural spiral elastically deformed parts 26b, and an outer circumference fixing part 26c. The coils 28a and 28b are wound on the approximately center surface of the movable part with a prescribed space secured between them. Furthermore, the divided permanent magnets 29a and 29b are attached to the housing 27.

7. 发明专利

JPH06131034A DIGITAL CONTROL CIRCUIT 失效
公开(公告)号：JPH06131034A
公开(公告)日：1994-05-13
申请号：JP28288992
申请日：1992-10-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MIZUKAMI MAKOTO , KATO KIKUJI
IPC分类号： G05B11/36 , G05B21/02 , H03M1/00 , H03M3/02
摘要： PURPOSE:To decrease the number of bits of converters and a DSP, to enlarge a dynamic range, and to attain a high resolution by transferring only the difference of a signal between an A/D converting part and a D/A converting part, and the DSP. CONSTITUTION:When an A/D converting part 1 receives an A/D converting instruction from a DSP 2, a difference signal detecting circuit 11 detects a difference input DELTAXn at every sampling cycle from an input Xn, and an A/D converter 12 A/D-converts the difference input DELTAXn, and transfers it to the DSP 2. The DSP 2 operates a digital signal processing necessary for an actuator control to the difference input DELTAXn, and calculates a difference output DELTAYn. When a D/A converting part 3 receives a D/A converting instruction from the DSP 2, a D/A converter 31 D/A-converts a difference output DELTAYn, an adding circuit 32 adds the difference output DELTAn to a held output DELTAYn-1 before one sampling cycle, and outputs an output Yn. Thus, only the difference of the output is transferred, so that the number of bits of the converters 12 and 31 can be decreased, and the high speed of the DSP can be attained.

8. 发明专利

JPH0573932A POSITIONING CONTROL SYSTEM FOR OPTICAL BEAM FOR OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0573932A
公开(公告)日：1993-03-26
申请号：JP23053591
申请日：1991-09-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUDO KAZUKI , KATO KIKUJI , YAMADA ICHIRO
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/005 , G11B7/0055 , G11B7/085 , G11B21/08
摘要： PURPOSE:To attain a high speed positioning by providing first and second position detectors, follow-up-controlling a corresponding tracking actuator with one detection signal, and, at the same time, controlling the other with a signal calculated based on this signal. CONSTITUTION:A reproduction beam 42 controlled by a second tracking actuator 60 is positioned at a target track at a high speed and with a high stability by counting moving tracks, and a first tracking actuator 56 which controls an erase beam 40, and a relative displacing actuator 62 (not indicated) which controls a recording beam 41, are displaced for positioning a light beam at the same track as the beam 42, so that the optical beam can be positioned at the target track simultaneously with the beam 42. That is, the present track number of the beam 42 is compared with the target track number, and a seek means is selected by the number of the moving tracks, so that the position operation can be operated, by a positioning command from a positioning controller 80.

9. 发明专利

JPH0461633A LIGHT BEAM FOLLOW-UP CONTROL METHOD FOR OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0461633A
公开(公告)日：1992-02-27
申请号：JP17126790
申请日：1990-06-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATO KIKUJI , KUDO KAZUKI , YAMADA ICHIRO
IPC分类号： G11B7/09
摘要： PURPOSE:To improve the track follow-up performance and the positioning accuracy by making a positioner to follow a motion of a tracking actuator being common to both reproducing and recording beams, and executing a feed forward control of a third tracking actuator. CONSTITUTION:With respect to one light beam of a recording beam 41 and a reproducing beam 42 condensed by a second objective lens 58, a positioner 65 is driven by using an output signal of a position detecting device 61 of a second tracking actuator 60 being common to both the beams 41, 42, and the control for setting a relative displacement of the light beam to the positioner 68 to about zero is executed while the light beam is following a track. Also, with respect to both beams or one beam of the other light beam and an erasing beam 40 condensed by a first objective lens 54, the control applied to a third tracking actuator 62 and/or a first tracking actuator 56 for an erasing beam is executed while the light beam is following the track. In such a way, the track follow-up performance and the positioning accuracy can be improved.

10. 发明专利

JPH0413232A OPTICAL HEAD 失效
公开(公告)号：JPH0413232A
公开(公告)日：1992-01-17
申请号：JP11484890
申请日：1990-04-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KATO KIKUJI , WATABE AKINORI , YAMADA ICHIRO
IPC分类号： G11B7/09
摘要： PURPOSE:To obtain the optical head having excellent mechanical resonance characteristics of movable parts by providing a 1st lens which converges the parallel light beams from a light source unit, a 2nd lens which converts the converged light beam again to the parallel light beams and a 3rd lens which converges the parallel light beams to the recording surface of the optical disk. CONSTITUTION:Either one of the 1st or 2nd lenses 31, 59 moves within the plane orthogonal with its optical axis in accordance with the turning around the axis of a 1st movable member 23 mounted with this lens. The 3rd lens 42 moves in its optical axis direction in accordance with the oscillation of a leaf spring 43 supporting the 2nd movable member 24 mounted with this lens. The generation of the unnecessary oscillation by the movement of either one of the 1st or 2nd lenses 31, 59 within the plane orthogonal with the optical axis or the movement of the 3rd lens 42 in the optical axis direction thereof is obviated and the optical head having the good mechanical resonance characteristics is obtd.

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