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

JPH11109007A LIGHT APPLIED CURRENT TRANSFORMER 失效
公开(公告)号：JPH11109007A
公开(公告)日：1999-04-23
申请号：JP26981297
申请日：1997-10-02
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI
IPC分类号： G01R33/032 , G01R15/24 , H01L31/02
摘要： PROBLEM TO BE SOLVED: To improve the response for detecting the change in quantity of light by multiplying the detection signal of a detection frequency component being obtained from each detection signal according to modulation light at a different frequency by a reference signal and performing AC/DC conversion by the double frequency component to be outputted. SOLUTION: Light with different frequencies from light sources 7 and 7' is applied to a Faraday rotor through each different light branching equipment, optical fiber, convergence lens, and polarizer in different directions. Light whose quantity is changed by the Faraday effect is passed through a polarizer, a convergence lens, and a light branching equipment that differ from previous ones and then light J1 " and J2 " are photoelectrically converted by photoelectric conversion parts 8 and 8'. The signal is multiplied by a reference signal being outputted from phase-adjusting equipment 14 and 14' by multipliers 15 and 15', and the signal is inputted to A/D converters 17 and 17' through filters 16 and 16' for passing each frequency component, thus obtaining each DC signal being subjected to AC/DC conversion. An adder 18 and a subtractor 19 obtain the sum and difference, divide a differential signal by a sum signal by a divider 20, and detects the change in the quantity of light due to the Faraday effect.

2. 发明专利

JPH08226939A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH08226939A
公开(公告)日：1996-09-03
申请号：JP3233795
申请日：1995-02-21
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI , SHIMIZU MAKOTO
IPC分类号： G01R15/24 , G02F1/09
摘要： PURPOSE: To compensate the influence of temperature change on a magnetic optical sensing part of an optical current transformer and perform highly accurate measuring. CONSTITUTION: A Faraday rotator 6 is disposed between two polarizers 4, 5 whose passing polarization directions are different from each other, and a magnetic optical sensing part is constituted. Light is incident on the reverse direction from light transmission parts 2, 2'. Two light sources 7, 7' emitting incident light emit light having same wavelength characteristics, and outgoing light from the magneto-optical sensing part is converted into an electric signal with photoelectric conversion parts 8, 8'. Two beams of light passing the magneto-optical sensing part in mutually opposite directions are intensity- modulated at mutually different frequencies, an intensity-modulated frequency component is selectively extracted from the electric signal after photoelectric conversion, and the change of intensities of the two beams of light by Faraday effect is differentially calculated and found.

3. 发明专利

JPH11264766A OPTICAL APPLICATION CURRENT TRANSFORMER 失效
公开(公告)号：JPH11264766A
公开(公告)日：1999-09-28
申请号：JP6811598
申请日：1998-03-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KIUCHI TADASHI , HAYASHIDA HIROSHI , HAKARI TOSHIHISA , NAKAGAMA YOSHIAKI
IPC分类号： H01F38/28 , G01J4/00 , G01R29/08
摘要： PROBLEM TO BE SOLVED: To provide the measurement method of high accuracy particularly with the compensation of the fluctuation of the luminous quantities of the light sources in an optical application current transformer. SOLUTION: In the total composition for making two lights perpendicular to each other incident on a Faraday rotator 6, and calculating the sum and difference thereof, a part of the luminous quantities of the light sources 7, 7a are branched by the optical branch devices 9, 9a to measure the same, so that the luminous quantities of the light sources are monitored to be used as the reference light, and the dividing operation with the signal light transmitting the Faraday rotator 6 is executed. As a ratio of the reference light monitored by the optical branch devices 9, 91 and the signal light transmitting through the Faraday rotator 6 is constant even when the luminous quantities of the light sources 7, 7a are fluctuated, the fluctuation of the luminous quantities can be compensated by the dividing operation of the same.

4. 发明专利

JPH11264767A OPTICAL APPLICATION CURRENT TRANSFORMER 失效
公开(公告)号：JPH11264767A
公开(公告)日：1999-09-28
申请号：JP6811698
申请日：1998-03-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KIUCHI TADASHI , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI , HAKARI TOSHIHISA
IPC分类号： H01F38/28 , G01J4/00 , G01R15/24 , G01R29/08
摘要： PROBLEM TO BE SOLVED: To provide the measurement method of high accuracy with the compensation of the fluctuation of the luminous quantity of a light source. SOLUTION: In the total composition where two lights perpendicular one other are made incident on a Faraday rotator 6 and the sum and different operation thereof is executed, the leakage of the light is measured by the optical branch devices 7, 7a for monitoring the luminous quantities of the light sources to be used as the reference light, and the dividing operation with the signal light passing through the Faraday rotator 6 is executed. As a ratio of the reference light monitored by the optical branch device 9, 9a and the signal light passing through the Faraday rotator 6 is constant even when the luminous quantities of the light sources 7, 7a are fluctuated, the fluctuation of the luminous quantities can be compensated by the dividing operation of the reference light and the signal light.

5. 发明专利

JPH11108964A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH11108964A
公开(公告)日：1999-04-23
申请号：JP26646597
申请日：1997-09-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI
IPC分类号： G01R33/032 , G01R15/24
摘要： PROBLEM TO BE SOLVED: To provide an optical current transformer in which the reflective surface of a peripheral integration type optical CT sensor is protected by a simple structure and the possibility of contamination or damage on the reflective surface is lessened. SOLUTION: The transformer comprises a Faraday effect glass 1 having a central hole penetrating a conductor and an optical path 4 surrounding the through hole. The Faraday effect glass 1 has a reflective surface 5a bending the optical path at right angle and a protective glass 6a is bonded to the reflective surface 5a through air layers 7a-7c. The air layers 7a-7c is conducted with the outer air or enclosed by filling dry air, as required. The protective glass can be provided on the reflective surface by simple structure through the air layers and since the reflective surface is not exposed, handling is facilitated. Consequently, the possibility of contamination or damage on the reflective surface can be lessened significantly.

6. 发明专利

JP2000221214A PHOTOVOLTAIC SENSOR FOR HIGH VOLTAGE 失效
公开(公告)号：JP2000221214A
公开(公告)日：2000-08-11
申请号：JP2620399
申请日：1999-02-03
申请人： HITACHI LTD
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KUBOTA YOSHIMASA
IPC分类号： G01R15/24
摘要： PROBLEM TO BE SOLVED: To obtain a photovoltaic sensor for high voltages having a superior withstand voltage characteristic, a superior temperature characteristic and the like by arranging a transparent electrode of an electro-optic element having a natural rotary polarization to a nearly central part of a transmission face and eliminating process distortions generated to a peripheral edge part of the transmission face. SOLUTION: The photovoltaic sensor includes a polarizer for converting an incident light to a linearly polarization, a 1/4 wave plate for converting the linearly polarization to a circularly polarized light, an electro-optic element for passing the circularly polarized light and phase modulating the light in accordance with an impressed high voltage, and an analyzer for detecting the light passing the electro-optic element. The electro-optic element 5 is an electro-optic element having a natural rotary polarization. Layered electrodes 6a-6c are disposed to a nearly central part of each light transmission face of the electro-optic element. A predetermined creeping distance is obtained between the layered electrodes on the basis of a distance L between a peripheral edge part of the layered electrodes and a peripheral edge part of the light transmission face of the electro-optic element, and a thickness d of the electro-optic element. Moreover, influences of process distortions to the peripheral edge part of the light transmission face are eliminated.

7. 发明专利

JPH0575187A HIGH-REPETITION ULTRAVIOLET LASER EQUIPMENT AND METHOD AND APPARATUS FOR SYNTHESIZING VITAMIN D 失效
公开(公告)号：JPH0575187A
公开(公告)日：1993-03-26
申请号：JP23440291
申请日：1991-09-13
申请人： HITACHI LTD
发明人： TAKEHISA KIWAMU , SHIROKURA TOSHIJI , KUWABARA KOJI , YANO MAKOTO
IPC分类号： A61N5/06 , H01S3/08 , H01S3/108 , H01S3/227
摘要： PURPOSE:To improve the wavelength conversion efficiency if an ultraviolet laser equipment by forming a resonator of an optical system whose medium is metal vapor laser and which has two focuses, where one focus is passed through a pinhole and the other focus is provided with a nonlinear optical element and by providing the optical axis between them with a dichroic mirror. CONSTITUTION:A resonator of a high-repetition ultraviolet laser equipment 1 is constituted of a total reflector 3 and a concave mirror 9 and incorporates a pinhole plate 7 and a nonlinear optical element 8, and an ultraviolet ray 0 that is a generated second harmonic is extracted outside the resonator from a dichroic mirror 5. A discharge tube 2 in the resonator contains copper vapor that is the laser medium together with the buffer gas. By such internal resonator wavelength conversion, fundamental waves do not advance outside the resonator, but only ultraviolet rays converted in wavelength are extracted outside from the dichroic mirror 5, so that the wavelength conversion efficiency is high. This equipment can provide an ultraviolet ray of wavelength 289nm or wavelength 271nm and therefore generate vitamin D.

8. 发明专利

JPH02292879A METAL VAPOR LASER DEVICE 失效
公开(公告)号：JPH02292879A
公开(公告)日：1990-12-04
申请号：JP11375089
申请日：1989-05-08
申请人： HITACHI LTD
发明人： WADA AKIRA , SUGAWARA HIROYUKI , YAMAGUCHI MOTOO , SHIROKURA TOSHIJI , OHASHI TSUNEYOSHI , YOSHIKAWA TOSHIMITSU
IPC分类号： H01S3/03
摘要： PURPOSE:To keep a plasma discharge tube stable in position so as to make a laser device stable in output preventing it from varying in output in each operation by a method wherein a compression spring is coaxially provided between both the ends and an outer case. CONSTITUTION:In a metal vapor laser device provided with a heat-resistant plasma tube 1, a heat resistant glass tube 3 coaxially fitted to the outer periphery of the plasma tube 1 through the intermediary of a heat insulating member 2, and an outer case which surrounds the heat resistant plasma tube 1 and the heat resistant glass tube 3 and supports the heat resistant glass tube 3 through the intermediary of O rings 4 fitted to the outer periphery of the heat resistant glass tube 3 making it movable in an axial direction, compression springs 18 and 19 are coaxially provided between both the ends of the heat resistant glass tube 3 and the outer case. For instance, coiled compression springs 18 and 19 formed of material such as metal, ceramic, or the like high in heat resistance are mounted between the outer faces of large diameter of side face supports 9 and 10 and spring guides 16 and 17 which are coaxially bonded to the plasma tube 1 and formed of material such as metal, ceramic, or the like high in heat resistance.

9. 发明专利

JPS60217677A LASER RESONATOR 失效
公开(公告)号：JPS60217677A
公开(公告)日：1985-10-31
申请号：JP7270384
申请日：1984-04-13
申请人： HITACHI LTD
发明人： TAKEMORI SEI , IWAKI KIYOE , OOHASHI TSUNEYOSHI , SHIROKURA TOSHIJI
IPC分类号： H01S3/08
摘要： PURPOSE:To prevent the change of a beam shape by the position of laser processing, and to improve the performance of laser processing by setting the aperture of a diaphragm fitted near an output mirror to a value larger than a beam diameter. CONSTITUTION:A laser resonator is constituted by a total reflection mirror 1 and an output mirror 2, and single mode beams are generated by the laser resonator containing an internal laser medium 3. In such a resonator, beams in the vicinity of the output mirror 2 are limited to an aperture of substantial 1.5 times or more of the diameter of the single mode beams in the vicinity of the output mirror 2, and beams are extracted to the outside of the laser resonator. The aperture d3 of a diaphragm such as one 5a is brought to magnitude of 1.5 times or more of a beam diameter d2 at the position. Accordingly, since an effect that the peripheral section of the single mode beams emitted from the resonator is cut off can be ignored substantially, the laser resonator generating the single mode beams changing no shape of laser beams even when laser beams are propagated to a remote position is obtained.

10. 发明专利

JPS6028152B2 失效
公开(公告)号：JPS6028152B2
公开(公告)日：1985-07-03
申请号：JP13980280
申请日：1980-10-08
申请人： HITACHI LTD
发明人： TAKEMORI SEI , SUGAWARA HIROYUKI , KUWABARA KOJI , SHIROKURA TOSHIJI , KAWAKUBO YUKIO , SASAKI HIROHARU
IPC分类号： H01S3/03 , H01S3/034 , H01S3/05 , H01S3/08

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