专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH06139641A METHOD FOR REPRODUCING MAGNETO-OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH06139641A
公开(公告)日：1994-05-20
申请号：JP28436792
申请日：1992-10-22
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： FUJIMOTO KOJI
IPC分类号： G11B7/00 , G11B7/005 , G11B11/10 , G11B11/105
摘要： PURPOSE:To correct the fluctuation in a reproducing signal and to detect data with high reliability by detecting a signal exceeding a threshold value as a data signal after uniformizing a modulation component in the reproducing signal from an optical pickup to a fixed width amplitude. CONSTITUTION:The reproducing signal is clamped to VL by providing an amplitude limiter 3 to the poststage of the optical pickup and a maximum amplitude VH is made to coincide with the VL. The reproducing signal obtained in such a manner whose amplitude difference is adjusted through an AGC circuit 4 further, and the threshold value is detected by a comparator 5, and is converted to the data signal by a binarization circuit 6 and outputted. In such a manner, the dispersion in the recording sensitivity of a magneto-optical recording medium and the fluctuation in the amplitude due to the difference of inner and outer peripheries are possible.

2. 发明专利

JPH0545389A MEASURING METHOD OF ELECTRIC RESISTANCE OF THIN FILM 失效
公开(公告)号：JPH0545389A
公开(公告)日：1993-02-23
申请号：JP20798191
申请日：1991-08-20
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： FUJIMOTO KOJI
IPC分类号： G01R27/02
摘要： PURPOSE:To measure an electric resistance value easily and highly precisely without measuring the thickness of a sample, by calculating the electric resistance value of a thin film from detection voltages and electrification current values measured by at least two sets of electrode systems of, which inter-electrode distances are different. CONSTITUTION:A current is made to flow from an AC constant current source 1 to a thin film sample 3 through electrification electrodes 4 and voltages are detected by two sets of electrode systems composed of detecting electrodes 5 and 6. On the occasion, an electrification frequency is selected so that a stray current or a surface current is avoided. Electrification current values are converted into voltage values by a noninductive type shunt resistor 2 for current value detection and these values are passed through isolated amplifiers 7 to 9 and AC-DC converters 10 to 12 together with the voltages detected by the electrodes 5 and 6, sampled by an A/D converter 13 and inputted to an arithmetic device 14. In the device 14, the electrical resistivity of the sample 3 is calculated from inter-electrode distances, the current values and the voltage values. Thereby the time and labor for measuring the thickness of the sample 3 can be saved and also the resistivity can be measured with high precision. An electric resistance value such as a surface resistance value which is intrinsic to a substance can also be measured in the same way.

3. 发明专利

JPH05166325A HUB ATTACHMENT METHOD FOR OPTICAL DISK 失效
公开(公告)号：JPH05166325A
公开(公告)日：1993-07-02
申请号：JP33680291
申请日：1991-12-19
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： SHIMIZU HIROSHI , FUJIMOTO KOJI , ITO HIRONOBU
IPC分类号： G11B23/00 , G11B23/113
摘要： PURPOSE:To quickly position en X-Y table with no vibration and at the low cost without using any highly precise sensor by moving the X-Y table up to its target position in a certain degree of accuracy under the closed loop control and then positioning the X-Y table with high accuracy under the open loop control. CONSTITUTION:In regard of the drive control method of an X-Y table for adjustment of the core of a disk mount part, the X-Y table is roughly positioned under the closed loop control and then precisely positioned under the open loop control.

4. 发明专利

JPH05159303A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH05159303A
公开(公告)日：1993-06-25
申请号：JP32305891
申请日：1991-12-06
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： YAMATO MASAYUKI , FUJIMOTO KOJI , ONO MASARU , TAKADA HIROKAZU
IPC分类号： G11B7/00 , G11B7/005 , G11B7/135 , G11B11/10 , G11B11/105
摘要： PURPOSE:To improve recording and reproducing characteristics of CNR, BER, etc., in a high density area and also to reduce cost by recording and/or reproducing by means of a laser beam having a square cross-section. CONSTITUTION:An outgoing light 2 is made parallel rays of light 4 by a collimator lens 3, made a square cross-section by a square diaphragm 6 and converged on the recording face of a magneto-optical disk 9 in a nearly square cross-section by means of an objective lens. In this case, the parallel rays of light 4 are used in an elliptic shape as they are without the use of a beam shaping prism, which, by making the major axis of the ellipse coincide with the radius direction of the optical disk, the distribution of light intensity of the beam at the time of recording is uniformized with the radius direction of the optical disk, and the formation of more straight edge is facilitated.

5. 发明专利

JPH04320909A INSPECTING METHOD FOR OPTICAL DISK 失效
公开(公告)号：JPH04320909A
公开(公告)日：1992-11-11
申请号：JP9046891
申请日：1991-04-22
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： TOBISAWA TAKESHI , FUJIMOTO KOJI
IPC分类号： G01B11/30 , G01N21/88 , G01N21/95 , G11B7/26
摘要： PURPOSE:To detect nonuniformity in coating of a resin coating film applied on an optical disk base, simply, reliably and with high sensitivity. CONSTITUTION:By making a monochromatic light be transmitted through or reflected on an optical disk base 11 coated with resin, images of nonuniformities 13 and 14 in coating of a resin coating layer 12 are projected on a solid-state image sensing element (CCD sensor) 35 and the light and shade caused by the nonuniformities 13 and 14 in coating are detected by the CCD sensor. By detecting reliably the nonuniformities 13 and 14 in coating of the resin coating film 12 provided on the optical disk base 11, an optical disk of high reliability can be furnished.

6. 发明专利

JPH04270772A RESIN COMPOSITION FOR HARD-COATING OF OPTICAL DISK 失效
公开(公告)号：JPH04270772A
公开(公告)日：1992-09-28
申请号：JP3077091
申请日：1991-02-26
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： TSUKADA MASAKAZU , FUJIMOTO KOJI , OTAKA SHINICHIRO , ITO HIRONOBU , KONO MICHIHIRO , TOBISAWA TAKESHI , MIYAHARA TETSUKUNI
IPC分类号： C08F220/20 , C08F220/10 , C08J7/04 , C09D4/00 , C09D4/02 , C09D5/00 , C09D137/00 , C09D143/00 , C09D155/00 , C09D157/00 , G11B7/24
摘要： PURPOSE:To provide a UV-curable coating material having antistaticity as well as hardness. CONSTITUTION:The objective resin composition contains (A) a phosphoric acid ester having acryloyl group or methacryloyl group and (B) an organic compound having >=2 active ethylene groups in one molecule. An optical disk may cause the error in reading, writing and erasing by the adhesion of dust in the environment and the flaw on the disk. The adhesion of dust can be prevented by the coating material. At the same time, the damage of the disk in handling can be prevented and the generation of the above errors can be suppressed by the application of a coating film having high surface hardness.

7. 发明专利

JPH0574061A METHOD FOR INSPECTING MAGNETO-OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0574061A
公开(公告)日：1993-03-26
申请号：JP23473091
申请日：1991-09-13
申请人： NIPPON KOKAN KK , DAINIPPON INK & CHEMICALS
发明人： FUJIMOTO KOJI
IPC分类号： G11B11/10 , G11B11/105 , G11B20/00 , G11B20/18 , G11B27/36
摘要： PURPOSE:To unnecessitate complex signal processing and to detect all recording error by compensating a phase difference between a recording signal and a reproducing signal and comparing both signals. CONSTITUTION:The recording signal pulse formed by the recording signal generator 1 is recorded to an optical disk 10 by a recording laser beam. Recorded information is reproduced by a reproducing laser beam. Reproduced information is pulse-formed by a reproducing signal converter 5 and inputted to a multiplier 7. On the other hand, the recording signal is inputted to the multiplier 7 after passing through a phase shifter 6. Then, the output of a maximum value detector 8 is monitored while changing the phase shift quantity of the phase shifter 6, by detecting a timing to be the maximum value, the phase difference between the recording signal and the reproducing signal is found. By feeding back the phase difference to the phase shift quantity of the phase shifter 6, the deviation of the time of both signals is eliminated, both signals are inputted to an exclusive OR circuit 9 and compared directly. Thus, a recording error is inspected accurately with a simple configuration.

8. 发明专利

JPH04271076A SCRATCH DEFECT CHECKING METHOD FOR OPTICAL DISK 失效
公开(公告)号：JPH04271076A
公开(公告)日：1992-09-28
申请号：JP3077291
申请日：1991-02-26
申请人： DAINIPPON INK & CHEMICALS , NIPPON KOKAN KK
发明人： FUJIMOTO KOJI , TSUKADA MASAKAZU , OTAKA SHINICHIRO , TOBISAWA TAKESHI , MIYAHARA TETSUKUNI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/26 , G11B23/00
摘要： PURPOSE:To automatically correct the variance of sensitivity among those optical elements forming an optical linear sensor by measuring the linear sensor at least twice after moving it in the radius direction of an optical disk. CONSTITUTION:An optical disk is chucked on a turntable 4 with the recording surface of the disk turned down, and the halogen light of a slit shape having the 65mm length and the 2mm width irradiates the surface of the disk in its radius direction. The reflected light 1 is received by a CCD linear sensor 5 provided on the upper surface side of the disk. Then 5000 optical elements forming the sensor 5 are arranged in a pitch of 10mum in the radius direction of the disk. The turntable 4 is turned once in a state where an optical irradiation system and a detection system are set at the fixed positions. Thus the full circumference of the disk is measured, end the light quantity detected on the entire surface of the disk is stored in a RAM 8 via a multiplexer 6 and an A/D converter 7. Then the sensor 5 is moved in the radius direction of the disk by an extent equal to one optical element, and the second measurement is carried out to the full circumference of the disk. Thus the full circumference of the disk is measured twice and therefore the scratch defects of the disk can be easily checked.

9. 发明专利

JP2000146994A METHOD AND APPARATUS FOR MEASUREMENT OF FLOW VELOCITY 失效
公开(公告)号：JP2000146994A
公开(公告)日：2000-05-26
申请号：JP32620798
申请日：1998-11-17
申请人： NIPPON KOKAN KK
发明人： OOTA KANEYUKI , FUJIMOTO KOJI
IPC分类号： B22D11/16 , G01D3/028 , G01P5/08 , G01P21/02
摘要： PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the flow velocity of a moving conductive object to be measured is measured without being influenced by a temperature drift when the flow velocity of the moving conductive object to be measured is measured on the basis of a detected magnetic-field signal in such a way that a magnetic field is excited on the object to be measured and that an induced magnetic field by the object to be measured is detected. SOLUTION: A set measuring time T1 in which a continuous measurement is finished before a change in an offset portion generated in a magnetic-field signal exceeds a target resolution since the continuous measurement is started in advance is set. In addition, an adjusting time T2 in which an offset portion generated in the magnetic-field signal immediately after the T1 expires is adjusted to zero is set. The measuring time T1 and the adjusting time T2 are generated alternately. A continuous measuring operation and an offset-portion adjusting operation are repeated.

10. 发明专利

JPH10239267A METHOD AND DEVICE FOR DETECTING DAMAGED PART OF PAINT FILM OF BURIED STEEL PIPE 失效
公开(公告)号：JPH10239267A
公开(公告)日：1998-09-11
申请号：JP5710297
申请日：1997-02-26
申请人： NIPPON KOKAN KK
发明人： FUJIMOTO KOJI , TEZUKA KOICHI
IPC分类号： G01N27/24 , G01N27/20
摘要： PROBLEM TO BE SOLVED: To detect the damaged position of a paint film in an underground buried pipe accurately and positively with a high sensitivity. SOLUTION: A signal generated by an M-series signal generator 10 is amplified by a power amplifier 3 and is applied between a buried steel pipe 1 and an installed electrode. A investigating machine 6 is run on a ground surface along the longer direction of the buried steel pipe 1 to detect a potential difference between wheel electrodes 6a and 6b. A reference signal with the same pattern as that of the signal from the M-series signal generator 10 is outputted from an M-series reference signal generator 11. The cross correlation between a potential difference between the wheel electrodes 6a and 6b and a reference signal is calculated by a correlation processing part, its peak value is adopted as the representative value of the potential difference, and an operation processing is made using the representative value, thus improving an S/N ratio drastically.

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