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51. 发明专利

JPH03218081A COPPER-VAPOR LASER DEVICE 失效
公开(公告)号：JPH03218081A
公开(公告)日：1991-09-25
申请号：JP1257390
申请日：1990-01-24
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： TAKEHISA KIWAMU , SHIROKURA TOSHIJI , YAMAI HIDEKI , KITSUKAWA TAKAHITO
IPC分类号： H01S3/08 , H01S3/03 , H01S3/098 , H01S3/106
摘要： PURPOSE:To make the wavelengths of green and yellow colors selectable with a Cu-vapor laser device by providing at least one convex lens and pinhole plate between resonators of an oscillator so that the intensity distribution of the laser beam of the device can be made to a circular form instead of an annular form and the spreading angle of the beam can be made narrower. CONSTITUTION:When only green laser light of 510.6nm in wavelength is to be oscillated, a fine-movement stage 6a is adjusted so that the interval between convex lenses 5 and 6 can become equal to the sum of the focal distances of the lenses 5 and 6 against green light and another fine-movement stage 7d is adjusted so that the distance between the lens 5 and pinhole plate 7 can become 598.7 mm (equal to the focal distance of the lens 5). As a result, the green laser light emitted from a laser tube 2 is focused on the pinhole of the plate 7 after passing through the lens 5 and becomes parallel rays after passing through the lens 6. The parallel rays oscillate while they make reciprocal movement between an output mirror 3 and totally reflecting mirror 4 and are emitted from the mirror 3 after oscillation. Only yellow light of 578nm can also be made to oscillate in the same way.

52. 发明专利

JPH02310978A METALLIC VAPOR LASER DEVICE 失效
公开(公告)号：JPH02310978A
公开(公告)日：1990-12-26
申请号：JP13174389
申请日：1989-05-25
申请人： HITACHI LTD
发明人： YAMAGUCHI MOTOO , SUGAWARA HIROYUKI , WADA AKIRA , SHIROKURA TOSHIJI , OHASHI TSUNEYOSHI , YOSHIKAWA TOSHIMITSU
IPC分类号： H01S3/03 , H01S3/036
摘要： PURPOSE:To prevent gaseous impurity of a heat insulating material from flowing into a discharge tube and to enable stable discharge and stable laser oscillation by forming a flow path which allows buffer gas to flow from an inner space side to a heat insulating material side between a discharge tube and each electrode. CONSTITUTION:A gas introduction port 40 is connected to an exhaust port of a gas supply bomb 44 through a piping 43 and buffer gas G is supplied. A gas exhaust port 33a which is provided to each flange section 33 of electrodes 3a, 3b is connected to an exhaust blower 46 through a piping 45. According to this constitution, buffer gas G supplied from the gas supply bomb 44 enters inside from the gas introduction port 40 and is exhausted from each gas exhaust port 33a which is arranged at both sides of a discharge tube 31 through operation of the exhaust blower 46. Buffer gas flows inside a laser device as shown by arrows 35, 36 and gaseous impurity is not made to exhaust which is discharged from a copper piece 11 which is a laser medium.

53. 发明专利

JPS6167976A Metallic reflective mirror 失效
标题翻译：金属反射镜
公开(公告)号：JPS6167976A
公开(公告)日：1986-04-08
申请号：JP18958584
申请日：1984-09-12
申请人： Hitachi Ltd
发明人： OHASHI TSUNEYOSHI , SUGAWARA HIROYUKI , SHIROKURA TOSHIJI
IPC分类号： G02B5/02 , G02B5/08 , H01S3/034 , H01S3/086
CPC分类号： H01S3/034
摘要： PURPOSE:To obtain the desired value of the laser beam spatial intensity distribution in a high-output carbonic acid gas laser resonator by arranging a plurality of recesses for reflecting laser beams irregularly in an inner surface of a total reflection mirror arranged on one end of the laser resonator. CONSTITUTION:A high-output carbonic acid gas laser resonator is composed of a total reflection mirror 1 and an output mirror 2 which are arranged on the end parts respectively, and a laser medium 3 contained in it. The produced laser beams 7 are reciprocated between the total reflection mirror 1 and the output mirror 2 and is amplified. Then a part of the beams is emitted from the output mirror 2. In this constitution, an annular absorber 6 is arranged in the vicinity of the total reflection mirror 1 for absorbing laser beams 5 as a part of the beams 7 to enhance a loss thereby preventing an increase in temperature of the total reflection mirror 1. Then a plurality of recesses 4 for reflecting the laser beams irregularly are arranged on an incident plane for laser beams of the total reflection mirror 1 and the irregular reflection is directed to the absorber 6. And the laser resonance is maintained in the part except the recesses 4.
摘要翻译：目的：为了获得高输出碳酸气体激光共振器中的激光束空间强度分布的期望值，通过布置多个凹槽，用于将激光束不规则地反射在布置在其上的全反射镜的内表面上激光谐振器。构成：高输出碳酸气体激光谐振器由分别配置在端部的全反射镜1和输出反射镜2构成，激光介质3包含在其中。产生的激光束7在全反射镜1和输出镜2之间往复运动并被放大。然后，一部分光束从输出反射镜2发射。在这种结构中，环形吸收体6布置在全反射镜1附近，用于吸收作为光束7的一部分的激光束5以增强损耗，防止全反射镜1的温度升高。然后，在全反射镜1的激光束的入射面上布置有用于反射激光束的多个凹部4，并且不规则反射被引导至吸收体6。激光谐振保持在凹部4以外的部分。

54. 发明专利

JPS60217678A LASER RESONATOR 失效
公开(公告)号：JPS60217678A
公开(公告)日：1985-10-31
申请号：JP7273584
申请日：1984-04-13
申请人： HITACHI LTD
发明人： SHIROKURA TOSHIJI , SUGAWARA HIROYUKI , TAKEMORI SEI , OOHASHI TSUNEYOSHI
IPC分类号： H01S3/08
摘要： PURPOSE:To obtain beams having intensity according to Gaussian distribution even in a resonator having one or more of Fresnel, and to acquire a high output laser proper to laser processing by gradually making coarse the surface roughness of a whole reflection mirror constituting a resonator with a proceeding toward an outer circumference thereof. CONSTITUTION:The surface roughness of an outer circumferential section except a section in the vicinity of the center is made coarse in at least one of reflecting mirrors 2, 3 for a laser resonator in which an enclosure, in which a laser medium 1 is encapsulated, and a plurality of the reflecting mirrors 2, 3 resonating laser beams are opposed to each another. With the total reflecting mirror such as one 3, the quality of a material is of oxygen-free copper, the surface is finished through diamond cutting, and surface roughness is made coarse gradually toward an outer circumference from the section of a diameter slightly smaller than the diameter of an aperture. Surface roughness is adjusted by using 100- 1000# abrasive paper, and the mean of surface roughness processed through a chucking to a lathe is brought to approximately 1mum. Accordingly, beams having the desired distribution of intensity can be obtained even on an application to a resonator having Fresnel of numeral 3.

55. 发明专利

JPS6015528A MEASUREMENT OF LASER BEAM CHARACTERISTICS 失效
公开(公告)号：JPS6015528A
公开(公告)日：1985-01-26
申请号：JP12330683
申请日：1983-07-08
申请人： HITACHI LTD
发明人： OOHASHI TSUNEYOSHI , KUWABARA KOUJI , KAWAKUBO YUKIO , SUGAWARA HIROYUKI , SHIROKURA TOSHIJI , TAKEMORI SEI , WADA AKIRA , SASAKI HIROHARU , YANO MAKOTO
IPC分类号： G01J1/02 , G01J1/42 , H01S3/00
摘要： PURPOSE:To measure the intensity and intensity distribution of a laser beam from a laser generator by using scattered lights thereof with an output mirror of a laser resonator or those with an optical element provided on a laser beam transmission path. CONSTITUTION:A reflector 3 used as an optical element is ground sufficiently looks plane macroscopically but is rugged microscopically. Therefore, most of a laser beam 2 incident into the reflector 3 is reflected and gives a laser beam 13 having the power and the intensity distribution almost equal to the beam 2 while a part theeof turns to a scattered light 12, the intensity of which is determined by the microscopic ruggedness of the reflector 3 and the intensity of the beam and the microscopic ruggedness is distributed uniform viewed macroscopically. With such an arrangement, the intensity distribution of the scattered light 12 almost corresponds to the intensity distribution of the beam 2 while the intensity thereof is proportional to the intensity of the beam 2. So, a signal proportional to the intensity of the beam 2 can be obtained by measuring the scattered light 12 with a detector 16 thereby enabling the measurement of the laser power while work is being processed.

56. 发明专利

JPS5982184A LASER BEAM MACHINE 失效
公开(公告)号：JPS5982184A
公开(公告)日：1984-05-12
申请号：JP19239982
申请日：1982-11-04
申请人： HITACHI LTD
发明人： SASAKI HIROHARU , KUWABARA KOUJI , SHIROKURA TOSHIJI
IPC分类号： B23K26/00 , B23K26/42
摘要： PURPOSE:To provide a laser beam machine which enables the early detection of the crack in a condenser lens by making the light from another light source except lase light for incident to the condenser lens for processing, condensing said light and measuring an intensity distribution. CONSTITUTION:Light 7 emitted from a light source 3, separately from passages 1, 12 for laser light, is made incident to a condenser lens 10. The transmitted light 14 through the lens 10 reflects on a reflection mirror 18, is focused by an optical fiber bundle 15 and is fed to an optical signal processing unit. The signal processing unit detects the scattering and the abnormality in the light distribution owing to the cracking of the lens 10 or the dust sticking thereto and emits a stop command to a laser generator or processing device. Since the abnormality in the lens can be treated while it is minor, the safe operation is assured. The condition of the lens 10 can be monitored with an alarm device for the abnormality of the condenser lens.

57. 发明专利

JPS5979122A Laser power measuring device 失效
标题翻译：激光功率测量装置
公开(公告)号：JPS5979122A
公开(公告)日：1984-05-08
申请号：JP18755682
申请日：1982-10-27
申请人： Hitachi Ltd
发明人： KUWABARA KOUJI , SUGAWARA HIROYUKI , SHIROKURA TOSHIJI , KAWAKUBO YUKIO , TAKEMORI SEI , SASAKI HIROHARU , OOHASHI TSUNEYOSHI
IPC分类号： G01J1/02 , B23K26/00 , G01J1/42
CPC分类号： G01J1/4257
摘要： PURPOSE:To measure the laser power even in the working state of an object to be worked, by providing a photodetector, which detects the scattered light from a reflective mirror, near the optical path of a laser light. CONSTITUTION:A laser light 10 emitted from a laser light generator 1 is reflected on the surface of a reflective mirror 7 and is condensed onto an object 9 to be worked through a condenser lens 8. A scattered light 12 from the reflective mirror 7 is detected by a photodetector 13, and the output is inputted to a power meter 14, and the power of the laser light during working is measured.
摘要翻译：目的：即使在被加工物的工作状态下，也可以通过在激光的光路附近设置检测来自反射镜的散射光的光检测器来测量激光功率。构成：从激光发生器1发射的激光10在反射镜7的表面上被反射，并被聚光到被加工物体9上，通过聚光透镜8被检测。来自反射镜7的散射光12被检测通过光电检测器13输出，并输出到功率计14，并测量加工时的激光功率。

58. 发明专利

JPS5717802A CENTER POSITION DETECTING DEVICE FOR LASER BEAM 失效
公开(公告)号：JPS5717802A
公开(公告)日：1982-01-29
申请号：JP9271980
申请日：1980-07-09
申请人： HITACHI LTD
发明人： SHIROKURA TOSHIJI , SUGAWARA HIROYUKI , KUWABARA SHIYOUJI , SASAKI HIROHARU , YOSHIOKA YOSHIO
IPC分类号： G01B11/00 , B23K26/00 , G01B11/27 , G01C15/00
摘要： PURPOSE:To always monitor the position of laser beam by constituting a bridge by 2 thin lines and 2 resistors and detecting balance of bridge with the use of variation of resistors by irradiation of the laser beam for working the material to be worked on these thin lines. CONSTITUTION:A bridge consists of thin lines 14a and 14b, and resistors 15a and 15b. Output of bridge is taken out from an amplifier 16. These two thin lines 14a and 14b are located in parallel and laser beam 3 is made incident to these thin lines 14a and 14b. When thin lines 14a and 14b are located in the symmetrical position to the center position of the laser beam 3, output of the amplifier 16 becomes 0, and when laser beam 3 is slided in horizontal direction, output is generated from the amplifier 16.

59. 发明专利

JPS56131981A CO2 GAS LASER DEVICE 失效
公开(公告)号：JPS56131981A
公开(公告)日：1981-10-15
申请号：JP3408280
申请日：1980-03-19
申请人： HITACHI LTD
发明人： KUWABARA SHIYOUJI , SUGAWARA HIROYUKI , SHIROKURA TOSHIJI , SASAKI HIROHARU , TAKEMORI SEI
IPC分类号： H01S3/097 , H01S3/036 , H01S3/22
摘要： PURPOSE:To obtain a stable laser output constantly by a method wherein the CO content in laser beams is set in desired limits after the passage of the beams through a catalyst part irrespective of the volume of injection power of glow discharge. CONSTITUTION:A laser medium 2 containing CO2 gas is filled up in a discharge tube 1. Glow discharge 5 is generated between electrodes 3 and 4, thereby CO2 is excited and laser beams 6 are generated. The laser beams 6 are reflected between mirrors 7 and 8 and a part thereby is taken out to the outside through the intermediary of the mirror 8. The laser medium 2 is cooled by a heat exchanger 10 located in a circulation channel 9 and CO and O2 are combined at a catalyst 12. The 1st region 12A of the honeycomb-shaped catalyst 12 prepared by impregnating Al2O3 with Pt is heated by a heater so as to be kept at the temperature at which the oxidation characteristic of CO shows saturation, while the 2nd region 12B thereof is kept at the temperature at which CO is not oxidized nearly at all. Since the CO content in the laser medium after passage thereof through the catalyst part can be controlled to take a desired value by changing the area ratio between the 1st and 2nd regions, the laser output can be stabilized.

60. 发明专利

JPS5687392A CARBON DIOXIDE LASER UNIT 失效
公开(公告)号：JPS5687392A
公开(公告)日：1981-07-15
申请号：JP16413679
申请日：1979-12-19
申请人： HITACHI LTD
发明人： SASAKI HIROHARU , KANBARA HIROYUKI , KUWABARA KOUJI , SHIROKURA TOSHIJI , TAKEMORI SEI
IPC分类号： H01S3/097 , H01S3/036 , H01S3/134
摘要： PURPOSE:To stabilize oscillation by maintaining a CO concentration at the optimum value by providing a sensor detecting gas status in a circulatory passage in a carbon dioxide laser device providing an oxidizing catalyst in the gas circulatory passage wherein the heating temperature of the catalyst is established. CONSTITUTION:A carbon dioxide laser unit is composed of a laser oscillation section 21 and a gas circulatory regeneration section 22. Discharge is performed by the laser oscillation section 21 and CO concentration of the gas having increased CO concentration is reduced by an oxidizing catalyst 12. Then, the gas is cooled by a heat exchanger 2 to feed to the laser oscillation section 21 again by increasing the pressure by a blower 1. In increasing the CO concentration, a sensor 18 detects to raise the temperature of the oxidizing catalyst 12 by controlling a power source 15 for heater and a coefficient of CO oxidation is increased. On the other hand in decreasing the CO concentration, the temperature of the catalyst 12 is lowered. As the result, the CO concentration in gas will be maintained at the optimum value for performing stable oscillation.

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