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1. 发明专利

JP2002026977A BAND DISTRIBUTION SERVICE METHOD IN DATA COMMUNICATION SYSTEM AND COMMUNICATION UNIT FOR PERFORMING IT 失效
公开(公告)号：JP2002026977A
公开(公告)日：2002-01-25
申请号：JP2000203072
申请日：2000-06-30
申请人： HITACHI LTD
发明人： SAWADA AKIYOSHI , INOUE HIROAKI
IPC分类号： H04L12/28 , H04L12/70 , H04L12/911 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To provide a novel band distribution service method in a data communication system, which can effectively utilize reserved bands by eliminating waste and to provide a communication unit to perform the method. SOLUTION: The communication service includes a priority reservation service where a service start time, a service end time and a communication band are applied in advance and a usual reservation service where a communication data quantity is applied. The priority reservation service reserves a band for a period when the reservation is applied until the reservation is finished, and the usual reservation type service uses a period not in use in the period for the band reserved by the reservation of the priority reservation type service.

2. 发明专利

JP2000058332A STATIONARY INDUCTION APPARATUS 失效
公开(公告)号：JP2000058332A
公开(公告)日：2000-02-25
申请号：JP22403498
申请日：1998-08-07
申请人： HITACHI LTD
发明人： HAMADATE YOSHIO , KASAHARA NAOKI , INOUE HIROAKI , TAKIZAWA ATSUSHI
IPC分类号： H01F27/34 , H01F27/26
摘要： PROBLEM TO BE SOLVED: To restrain local overheat due to eddy current to minimum loss by using a nonmagnetic fitting as connecting fitting with the apparatus body being accommodated in a tank. SOLUTION: An apparatus is horizontally fixed with a plurality of connecting fittings 40 and 50 positioned on the top surface and the bottom surface of the upper and the lower iron-core fastening fittings 7 and 8. A nonmagnetic material with large electrical resistivity is used as material of the connecting fittings 40 and 50 included in the outer most diameter in the internal winding 5 and the external winding 6. A material with electrical resistivity larger than that of normal steel, for example stainless material, is used as the nonmagnetic material of the connecting fittings 40 and 50. As a result, even if a large quantity of leakage flux from the windings infiltrates the upper and the lower connecting iron portions and eddy current is induced refluxing the connecting fittings, eddy current and loss thereof is reduced and local overheat can be prevented, while the deterioration of reliability and efficiency in the stationary induction apparatus is restrained.

3. 发明专利

JPH1195068A OPTICAL MODULE MOUNTING BOARD 失效
公开(公告)号：JPH1195068A
公开(公告)日：1999-04-09
申请号：JP25045097
申请日：1997-09-16
申请人： HITACHI LTD , REAL WORLD COMPUTING PARTNERSH
发明人： SHIGETA JUNJI , NISHIMURA SHINJI , INOUE HIROAKI
IPC分类号： G02B6/42 , G02B7/00 , H01L31/0232 , H01L33/48 , H01L33/00
摘要： PROBLEM TO BE SOLVED: To freely determine the distributed positions of optical fibers without coming in contact with heating parts such as LSIs by distributing the optical fibers, connected to optical modules so as to transmit optical signals, on a different face (back face) from an LSI mounted face (surface). SOLUTION: LSIs 2 are arranged between transmitting optical modules 3 and receiving optical modules 4, and optical fiber connectors 6. The transmitting optical modules 3, receiving optical modules 4, optical fiber connectors 6 and optical fibers 5 are respectively mounted on the opposite face (back face) to the LSIs 2 of a printed board 1. It is therefore so constituted that heating parts such as the LSIs 2 do not exist between the optical fiber connectors 6 and the transmitting optical modules 3 and receiving optical modules 4, so that the optical fibers 5 can be distributed in a free path such as a shortest path.

4. 发明专利

JPH10214981A OPTICAL SOCKET 失效
公开(公告)号：JPH10214981A
公开(公告)日：1998-08-11
申请号：JP1802697
申请日：1997-01-31
申请人： HITACHI LTD , GIJUTSU KENKYU KUMIAI SHINJOHO
发明人： NISHIMURA SHINJI , INOUE HIROAKI , SHIGETA JUNJI
IPC分类号： G02B6/42 , H01L31/0232 , H01L33/00 , H01L33/62 , H01S5/00 , H04B10/27 , H04B10/80 , H01S3/18 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To realize an optical socket which can shorten an electric wiring length, which is favorable for the high band of a signal, which can reduce a band limitation cause due to a pin bottleneck with reference to a replacement function desiring a high-speed processing operation, whose versatility as a replacement element is high and which is low-cost. SOLUTION: A photodetector 14 for data transmission-reception, a semiconductor laser 15, a control circuit for them, an electronic circuit which shares a replacement function and space optical-path changeover-type switches 18, 19 are mounted inside an IC socket 11a for electronic-circuit mounting, and the signal processing capability of an optical socket is intensified. A data output from the electronic circuit is converted into a light signal by a signal conversion immediately after a pin so as to be output to optical fibers 12.

5. 发明专利

JPH098406A REFLECTION PREVENTING FILM FORMING METHOD 失效
公开(公告)号：JPH098406A
公开(公告)日：1997-01-10
申请号：JP15130195
申请日：1995-06-19
申请人： HITACHI LTD
发明人： TAKANO HIDEAKI , TSUCHIYA TOMONOBU , IDO TATSUMI , KOIZUMI MARI , INOUE HIROAKI
IPC分类号： G02B1/11 , H01S5/00 , H01S3/18
摘要： PURPOSE: To measure the reflection factor of 1% or smaller by a method wherein a reflection preventing film is simultaneously deposited on a P-type InP board besides the sample to be deposited on the reaction preventing film. CONSTITUTION: A sample support 21 is provided when bar-like semiconductor lasers are fixed to a jig, the bar-like semiconductor lasers are arranged with their edge faces facing upward. A P-type InP board 23 is mounted adjacent to the semiconductor lasers 22, and the bar-like semiconductor lasers 22 are fixed by the plate spring 24 supported by a plate spring support 25. As the absorption of light originated in IVBA is large, the coefficient absorption of the P-type InP board 23 is larger by one order of magnitude or more than the N-type or a semi-insulating InP board. Accordingly, the residual reflection from the backside of the board is absorved into the board and residual reflection is not generated, and the reflection factor of 1% or smaller can be measured easily.

6. 发明专利

JPH07333468A OPTICAL CONNECTING METHOD 失效
公开(公告)号：JPH07333468A
公开(公告)日：1995-12-22
申请号：JP12221594
申请日：1994-06-03
申请人： HITACHI LTD
发明人： KITAJIMA SHIGEKI , INOUE HIROAKI , CHOKAI MINORU
IPC分类号： G02B6/42 , G02B5/32
摘要： PURPOSE:To provide an optical connecting method capable of improving optical coupling efficiency between an optical element and an optical fiber. CONSTITUTION:Light of the same wavelength as the wavelength of the light emitted from the optical element 1 is emitted from the optical fiber 2 to be connected and the interference of the two light rays is recorded on a photosensitive material 3, by which a volume hologram is produced. The optical element and the optical fiber is optically connected by the diffracted light formed by this volume hologram. As a result, the optical connection is made possible even by the arrangement to deviate or intersect the optical axes of the optical element 1 and the optical fiber 2.

7. 发明专利

JPH0794411A MANUFACTURE OF SEMICONDUCTOR THIN FILM 失效
公开(公告)号：JPH0794411A
公开(公告)日：1995-04-07
申请号：JP23781893
申请日：1993-09-24
申请人： HITACHI LTD
发明人： TAKANO HIDEAKI , TANAKA SHIGEHISA , NAKAMURA HITOSHI , INOUE HIROAKI
IPC分类号： H01L21/268 , H01L21/203 , H01L21/324
摘要： PURPOSE:To grow a thin film having excellent electrical and optical characteristics by using molecular beam epitaxy by providing a process for confirming a group III stabilized surface formed by performing thermal cleaning on the surface of a mixed crystal of compound semiconductors exposed on the surface of a substrate. CONSTITUTION:An oxide on the surface of a substrate is completely removed by thermal cleaning. In order to accomplish the above-mentioned purpose, the temperature of the substrate must meet such two requirements that all kinds of oxides existing on the surface of the substrate can be sublimated and the surface of a crystal must be stabilized. When the substrate is composed of InGaAs, InGaP, GaAsP, or InGaAsP, the temperature of the thermal cleaning is set at about 60 deg.C. In case the substrate is composed of InAsP, the temperature is set at about 540 deg.C.

8. 发明专利

JPH0688980A OPTICAL FREQUENCY CONVERSION ELEMENT 失效
公开(公告)号：JPH0688980A
公开(公告)日：1994-03-29
申请号：JP23925692
申请日：1992-09-08
申请人： HITACHI LTD
发明人： NISHIMURA SHINJI , INOUE HIROAKI , SANO HIROHISA , KANEKO TADAO , UCHIYAMA HIROYUKI
IPC分类号： G02F2/02
摘要： PURPOSE:To provide the optical frequency conversion element which is driven on a low voltage, is wide in band, high in efficiency and is non-dependent on incident and exit polarized light and the modulation form of signals by using s an optical waveguide structure formed by using a compd. semiconductor which can equivalently attain a phase plate rotating frequency conversion system capable of attaining conversion efficiency of 100% theoretical efficiency regardless of the modulation form of the input signals in optical frequency conversion with the electrooptical effect of the crystal and is advantageous for optical integration. CONSTITUTION:This optical frequency conversion system is constituted by adopting the element constitution to constitute the optical waveguide having the [1, 1, 1] directions of the compd. semiconductor, such as GaAs or InP having tri-symmetrical axes as the propagation direction and to impress a rotating electric field within the plane perpendicular to the propagation direction and further connecting the element in series. As a result, the effect equiv. to the effect of the phase plate rotating frequency conversion system is obtd. by using the electrooptical effect advantageous for high-speed modulation. The above- mentioned frequency conversion is thus possible.

9. 发明专利

JPH05333396A 失效
公开(公告)号：JPH05333396A
公开(公告)日：1993-12-17
申请号：JP13833992
申请日：1992-05-29
申请人： HITACHI LTD
发明人： INOUE HIROAKI , ISHIDA KOJI , KAYANE NAOKI
IPC分类号： G02F3/00
摘要： PURPOSE:To provide the large scale parallel optical element array which enables large scale flexible connection, and a system provided with a novel function for super-parallelly interconnecting those optical elements. CONSTITUTION:The number of the address dimensions of optical signals can be increased by combining a spatial optical switch 2 for spatially realizing the interconnection and a frequency type optical switch 3. Thus, the number of optical signal elements to be handled can be equivalently increased without enlarging the physical scale of optical elements. Since not only the dimension of a frequency but also the dimension of a frequency and polarization can be used for increasing the number of dimensions, the capacity of the interconnection can be considerably enlarged. Therefore, the scale of the array can be equivalently and considerably enlarged with the small sized optical elements having the spatially small array scale.

10. 发明专利

JPH05291694A 失效
公开(公告)号：JPH05291694A
公开(公告)日：1993-11-05
申请号：JP8531192
申请日：1992-04-07
申请人： HITACHI LTD
发明人： SANO HIROHISA , AOKI MASAHIRO , INOUE HIROAKI
IPC分类号： G02F1/025 , H01S5/00 , H01S5/06 , H01S3/18 , H01S3/103
摘要： PURPOSE:To realize a low-chirp, high-output light source suitable for ultrahigh- speed, extremely long distance data transmission. CONSTITUTION:A light modulator 2 is provided on the output side of a semiconductor laser 1, and a light amplifier 3 is provided on the output side of the light modulator 2. The spontaneous emission from the light amplifier 3 is fed back to the laser so that the frequency modulation of laser may offset the chirp occurring in the light modulator. As a result, it is possible to provide a low-chirp, high-power light source for optical communications, thereby realizing extremely long-distance transmission at ultrahigh speed.

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