专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明专利

JPH04335329A PRODUCTION OF SECOND HARMONIC GENERATING ELEMENT HAVING DIELECTRIC POLARIZATION INVERSION GRATING 失效
公开(公告)号：JPH04335329A
公开(公告)日：1992-11-24
申请号：JP10606091
申请日：1991-05-10
申请人： HITACHI LTD
发明人： ITOU AKITOMO , KAEDE HIROSHI , KAWAMOTO KAZUTAMI , HIYOSHI YASUO , SATO HIDEMI , FUKUSHIMA TAKAKO
IPC分类号： G02F1/37 , G02F1/355 , H01S3/109 , H01S5/00
摘要： PURPOSE:To provide the process for production which can form the polarization inversion gratings of the second harmonic conversion element of a laser beam to a rectangular sectional shape in order to enhance the conversion efficiency of this element. CONSTITUTION:Transition metal ions which lower the Curie temp. of a substrate 1 are implanted at

12. 发明专利

JPH1126762A SEMICONDUCTOR DEVICE AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH1126762A
公开(公告)日：1999-01-29
申请号：JP18209797
申请日：1997-07-08
申请人： HITACHI LTD , HITACHI MICROCOMPUTER SYST
发明人： FUKADA SHINICHI , KAEDE HIROSHI , KOJIMA MASAKI , ABE HIROMI , SUZUKI MASAYASU
IPC分类号： H01L21/28 , H01L21/336 , H01L29/78
摘要： PROBLEM TO BE SOLVED: To form a cobalt silicide film by suppressing the increase in junction leak at the p-n junction under the film by forming a Co film on the cobalt silicide layer after the cobalt silicide layer on source and drain electrodes is once grown, performing the process for forming the silicide at least once, and forming the film to the specified film thickness. SOLUTION: A thermal CVD-SiO2 film 8 is formed as an implantation through film on the entire surface of an Si substrate. After the film is removed, a CO film 10 is formed, and a TiN film 11 is formed on the film 10. Heat treatment is performed under the nitrogen atmosphere. A cobalt silicide layer 12 is selectively formed only on the electrode wherein Co and Si are in contact. After the Co film and TiN film remaining unreactive are removed, heat treatment is performed under the nitrogen atmosphere, and the cobalt silicide layer 12 is converted into CoSi2 . A side Co film 13 is formed on the entire surface of the substrate, and a TiN film 14 is formed thereon. The CoSi2 film is different from the CoSi2 film which is formed by heat treatment, wherein the entire quantity of the Co film is formed at one time whiteout separating the CoSi forming process. The cobalt silicide film can be formed without increasing the junction leakage current.

13. 发明专利

JPH08203058A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH08203058A
公开(公告)日：1996-08-09
申请号：JP861995
申请日：1995-01-24
申请人： HITACHI LTD
发明人： KAEDE HIROSHI , KUGIYA FUMIO , MARUYAMA YOJI , AKAGI KYO , KOMODA MIGAKU
IPC分类号： G11B5/66 , G11B5/09 , G11B5/56 , G11B5/596 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/84
摘要： PURPOSE: To produce a perpendicular magnetic recording medium having a servo-pattern small in surface unevenness and to provide its producing method. CONSTITUTION: A magnetic characteristic such as magnetic anisotropy, residual magnetization and coercieve force of a magnetic film 3 is selectively changed in accordance with the servo-pattern by partially changing the presence or absence and the film thickness, etc., of an under coat film 2 for controlling an orientation of the magnetic film 3, in accordance with a servo-pattern or by subjecting the magnetic film to laser-annealing. Then, a signal generated when the pattern is scanned with a magnetic head is used as a servo-signal for positioning of the magnetic head. And, a ROM pattern is formed by the same method.

14. 发明专利

JPH0720516A OPTICAL WAVEGUIDE ELEMENT 失效
公开(公告)号：JPH0720516A
公开(公告)日：1995-01-24
申请号：JP14731293
申请日：1993-06-18
申请人： HITACHI LTD
发明人： KAEDE HIROSHI , KAWAMOTO KAZUTAMI , ITOU AKITOMO
IPC分类号： G02B6/12 , G02F1/37 , G11B7/135 , H01S3/109
摘要： PURPOSE:To improve condensing efficiency and allowance for misalignment of condensing optical system without decreasing its performance by including a tapered structure in the entrance and exit part for light, and moreover, by forming a clad layer. CONSTITUTION:LiNbO3 with addition of MgO is used as a substrate 51. A domain reverse lattice 55 is formed by directly applying an electric field. The channel waveguide 13 includes a tapered entrance part 3 and a tapered exit part 4 for light and is formed by proton exchanging method. A clad layer 15 is formed by sputtering SiO2. By this method, phase matching is maintained in a long distance, namely, a long interactive length is formed so that the allowance for misalignment of condensing optical system can be improved without decreasing the performance of the light waveguide element. Further, by forming the clad layer 15, the profile of the guided light is made symnmetric in the longitudinal direction, which improves condensing efficiency.

15. 发明专利

JPH0997482A INFORMATION RECORDING AND REPRODUCING DEVICE AND EXPOSURE DEVICE 失效
公开(公告)号：JPH0997482A
公开(公告)日：1997-04-08
申请号：JP25360395
申请日：1995-09-29
申请人： HITACHI LTD
发明人： KOMODA OSAMU , MARUYAMA YOJI , YAMAMOTO HISANO , KAEDE HIROSHI , AKAGI KYO
IPC分类号： G11B5/82 , G11B5/596 , G11B5/64 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To make it possible to stack, in multiple stages, information recording mediums which utilize uneven patterns as servo information and to incorporate them into an information recording and reproducing device. SOLUTION: On a substrate 48 for information recording medium which has a fitting hole 49 to be fitted to the center of the rotation supporting mechanism of an information recording and reproducing device, a reticle pattern which holds the servo information or the information used for reproduction alone of the recording track set to form a concentric circle around the rotation axis of the substrate 48 is exposed by means of a demagnification projection aligner. The stage 47 of the demagnification projection aligner has a projection 51 which will fit to the fitting hole 49 of the substrate and a laser light source 61 installed on the center of the projection, and positioning is performed while the rays coming from the laser light source 61 are monitored by means of a detector 63 so as to penetrate the light penetrating section installed on the pattern center of the reticle 43a.

16. 发明专利

JPH07335963A SEMICONDUCTOR LASER INTERNAL RESONANCE TYPE SHG LIGHT SOURCE 失效
公开(公告)号：JPH07335963A
公开(公告)日：1995-12-22
申请号：JP12727394
申请日：1994-06-09
申请人： HITACHI LTD
发明人： KAWAMOTO KAZUTAMI , ITOU AKITOMO , KAEDE HIROSHI
IPC分类号： H01S3/109 , G02F1/37 , H01S5/00 , H01S5/06 , H01S3/103 , H01S3/18
摘要： PURPOSE:To obtain a high efficiency, low noise and stable output short wavelength coherent light source by a method wherein a fundamental wave is a longitudinal single mode wave in which other mode waves are suppressed by -25 dB or less. CONSTITUTION:A second harminic wave is generated by a polarization reversing lattice 3 in the light waveguide 2 of an optical substrate 1. Optical coating which is non-reflective or totally reflective for a fundamental wave and the second harmonic wave is applied to the end surface of the substrate 1. A semiconductor laser 5 is composed of a distribution Bragg reflector(DBR) which has high and low end surface reflectances and is wave-selective. The wave selectivity of the DBR 4 is shown by a complex reflectance R expressed by the formula (wherein K denotes a coupling factor, alpha1 denotes the light loss factor of the light waveguide, LB denotes the length of the DBR and delta denotes a discrepancy from a Bragg wave number). Therefore, the reflectance which satisfies the Bragg conditions when delta=0 is 87.5% and, if the longitudinal mode spacing of a resonator is not less than 0.01nm, a standardized reflectance difference is not larger than -0.05 and the fundamental wave is oscillated as a single mode and the other mode waves can be suppressed below a required noise level.

17. 发明专利

JPH06174908A PRODUCTION OF WAVEGUIDE TYPE DIFFRACTION GRATING 失效
公开(公告)号：JPH06174908A
公开(公告)日：1994-06-24
申请号：JP33019692
申请日：1992-12-10
申请人： HITACHI LTD
发明人： KAEDE HIROSHI , ITOU AKITOMO , KAWAMOTO KAZUTAMI
IPC分类号： G02B5/18 , G02B6/12 , G02B6/13
摘要： PURPOSE:To produce the fine optical waveguide type diffraction grating consisting of a ferroelectric substance for coupling a waveguide mode and a radiation mode with high efficiency by previously using a ferroelectric sub stance substrate subjected to polarization inversion to a desired diffraction grating pattern shape. CONSTITUTION:The substrate 51 consisting of LiNbO3 doped with 5mol% MgO subjected to optical polishing on the +c surface is ultrasonically cleaned and is rapidly dried. A Ti film 81 is then formed by sputtering on the +c surface. A photoresist 82 is thereafter applied on this Ti film 81. This photoresist 82 is patterned by using a photomask windowed with the recessed parts of the diffraction grating. The Ti film 81 is patterned with this patterned photoresist as a mask. The substrate is then put into a diffusion furnace and is heat treated in an Ar atmosphere to form the domain inversion regions 56 on the +c surface of the substrate 51. A thin film 52 of LiNbO3 single crystal is formed by a liquid phase epitxial crystal growth method. The directions of the polarization parts 54, 55 is the same as the polarization direction of the substrate 51 regardless of periods when the of the thin film 52 and the substrate 51 is etched. The perpendicular boundary is thus formed at this boundary.

18. 发明专利

JPH0667234A WAVEGUIDE INTERNAL RESONANCE TYPE SHG LIGHT SOURCE 失效
公开(公告)号：JPH0667234A
公开(公告)日：1994-03-11
申请号：JP22406392
申请日：1992-08-24
申请人： HITACHI LTD
发明人： ITOU AKITOMO , KAWAMOTO KAZUTAMI , KAEDE HIROSHI , KOMODA MIGAKU
IPC分类号： G02F1/37
摘要： PURPOSE:To increase the 2nd higher harmonic conversion efficiency of a waveguide internal resonance type 2nd higher harmonic generating element which converts infrared laser light into visible light and to stabilize oscillation wavelength. CONSTITUTION:An optical waveguide 4 is formed in an epitaxial thin film on a substrate and a polarization inversion part 3 and a diffraction grating 5 are installed adjacently in the optical waveguide 4; and light from a semiconductor laser 7 is made incident on the polarization inversion part 3 and converted into a 2nd higher harmonic, the following diffraction grating 5 reflects the fundamental wave to the side of the semiconductor laser 7, and only the 2nd higher harmonic is outputted. Further, a voltage is impressed to electrodes provided on the diffraction grating 5 to adjust the semiconductor laser wavelength.

19. 发明专利

JPH0981928A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER USING THE SAME 失效
公开(公告)号：JPH0981928A
公开(公告)日：1997-03-28
申请号：JP23813795
申请日：1995-09-18
申请人： HITACHI LTD , HITACHI MAXELL
发明人： KAEDE HIROSHI , ADACHI KAZUNORI , FUTAMOTO MASAAKI , AKAGI KYO , TANAHASHI KIWAMU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/82
摘要： PROBLEM TO BE SOLVED: To ensure low noise and to enable a high-speed recording even when a plastic having a low softening point is used as a substrate by imparting a prescribed surface roughness to a magnetic film. SOLUTION: A substrate 1 is made of surface-tempered glass, a Cr film as an under film 2, a CoCrPt film as a magnetic film 3 and a carbon film as a protective film 4 are successively formed under the same condition in film formation and then a lubricant film 11 is formed by vacuum deposition. The magnetic film 3 contains at least grains having (100) faces parallel to the film surface and a hexagonal closest-packed structure and grains having (101) faces parallel to the film surface and a hexagonal closest-packed structure. The ratio between the peak intensity of the X-ray diffraction of the grains having (100) faces parallel to the film surface and that of the grains having (101) faces parallel to the film surface is 1:0.5 to 1:5.

20. 发明专利

JPH08180350A MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE, AND MAGNETIC RECORDER 失效
公开(公告)号：JPH08180350A
公开(公告)日：1996-07-12
申请号：JP32029894
申请日：1994-12-22
申请人： HITACHI LTD , HITACHI MAXELL
发明人： AKAGI KYO , SAKAMOTO AKITO , KUGIYA FUMIO , KAEDE HIROSHI , KOMODA MIGAKU
IPC分类号： G11B5/66 , G11B5/596 , G11B5/65 , G11B5/73 , G11B5/82 , G11B5/84
摘要： PURPOSE: To precisely write servo information. CONSTITUTION: Pits 14 are arranged on a servo information area 10 of a magnetic film F formed on a substrate S at an interval in the direction of an information recording/reproducing track width. A magnetic signal area 15 magnetically recording the servo information is formed between adjacent pits 14 so as to reach the pit 14, and both edges of the magnetic signal area 15 in the direction of the information recording/reproducing track width are formed by the pits 14. One or plural magnetization inversion 15b are recorded on the magnetic signal area 15.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式