Abstract: A portion of the shielding gas of the welding is sent through passages (17) which traverse a copper block (16) mounted in the working head (1) beyond the reflecting mirror (8).Application to the sleeving by laser welding of the tubes of steam generators of electro-nuclear power stations.

Abstract: A work rotating apparatus for laser machining has a reduction unit with input and output shafts, and a motor for rotating the input shaft. The output shaft is a hollow shaft having an axial through hole. A work holder, mounted on the output shaft, also has a through hole aligned with the through hole of the output shaft. A long workpiece can be held in the work holder with a part of the workpiece extending through the through hole of the work holder and into or through the through hole of the hollow output shaft. This enables the workpiece to be held more stably and securely, and allows the portion of the workpiece which is being machined to be positioned close to the work holder.In one version, the reduction unit is supported by mounting legs, enabling the work to be positioned close to the laser machine table and farther from the laser head.

Abstract: A laser machining apparatus having a laser oscillator connected to a laser robot by a beam transmitting apparatus made of beam ducts, in which the beam ducts are hermetically sealed between the outlet of the laser oscillator and the laser beam outlet of laser robot, and a working gas supplying inlet is mounted at an upper portion of the beam ducts for transmitting of the gas through the beam ducts and outputting of the gas at a nozzle in the laser robot head. According to the above construction, the present invention is able to prevent an occurrence of the heat lens phenomenon, and also able to prevent fumes and dust from entering into the beam duct.

Abstract: A method of manufacturing an extruder barrel is disclosed which fabricates a barrel in two longitudinal sections and joins the sections together by electron beam welding. In a preferred form, the barrel sections are formed by machining conical recesses longitudinally in each section whereby a complementary bore is defined by the assembled barrel sections. The machined recesses may be formed with spiral, longitudinal or radial grooves. The recesses may be a uniform conical shape, stepped conical or a dual tapered shape.

Abstract: An electrically powered portable cigarette lighter includes a laser for generating a beam of energy, a focusing system for forming the beam of energy into a substantially hollow doughnut shaped beam which is focused to a point in the region of the end of a cigarette inserted into the lighter. Means are provided for preventing the beam of energy from escaping through the opening in which the cigarette is inserted.

Abstract: A laser nozzle has an inner end adapted to be secured to a laser head and an outer end to be disposed adjacent a workpiece. An axial bore extends longitudinally therethrough with an inlet end and an outlet end and provides a passage therethrough for the laser beam and a cutting gas. The bore narrows at a point along its length spaced from the outlet end to define a throat portion in the bore, and at least one auxiliary rectilinear passage extending from the throat portion to the outer end of the nozzle adjacent the outlet end of the bore for passage of cutting gas therethrough. The nozzle, or the cutting head and nozzle, may be rotated to locate the auxiliary passage in a position trailing the laser beam. In another embodiment, a multiplicity of circumferentially spaced auxiliary passages may be opened or closed by a regulator to provide flow of cutting gas through passages which trial the laser beam.

Abstract: A disk manufacturing apparatus produces a master disk of optical disks with a high recording density in a short time. According to one aspect, the apparatus comprises a housing forming a vacuum space; a holder holding a master disk having a recording surface subjected to an electron beam resist application process in the housing; a plurality of cold-cathode emitter elements, arranged two-dimensionally within a plane of beam irradiation to the master disk, irradiating an electron beam toward the master disk of optical disks when driven; and a driver selectively driving the a plurality of cold-cathode emitter elements. According to another aspect, the apparatus comprises at least one cold-cathode emitter element irradiating an electron beam toward the master disk when driven; a magnetic field lens, disposed between the cold-cathode emitter element and the master disk, focusing the electron beam emanated from the cold-cathode emitter elements.

Abstract: A method and apparatus for welding together two metal workpieces, at least one of which has thereon a coating material which enters a fluid or visco-elastic phase at a temperature below the melting temperature of the workpieces, the method comprising the steps of subjecting the workpieces to a preliminary preparative treatment at a zone to be welded and thereafter applying (preferably be means of a high-energy beam such as a laser beam) sufficient heat to the workpieces at the weld zone to effect there the welding together thereof, wherein the preliminary preparative treatment comprises preheating the workpieces to the said lower temperature and pressing them together, at the zone to be welded with a force sufficiently great to expel coating material from between the workpieces at the weld zone. thereby to improve the quality of the subsequent weld.

Abstract: An attitude control system controls the attitude of a nozzle of a CNC laser beam machining apparatus with respect to a workpiece surface being three-dimensionally machined thereby. An interpolator (1) for interpolating values with respect to .alpha.-, .beta.-, X-, Y-, and Z-axes produces interpolation outputs (P.alpha., P.beta.) for the .alpha.- and .beta.-axes. The interpolation output (P.alpha.) for the .alpha.-axis is read by a corotation compensator (2), which calculates a corotation corrective (.DELTA..beta.) depending on the gear ratio of gears by which horizontal and vertical shafts of the .beta.-axis are coupled to each other. The corotation corrective (.DELTA..beta.) is added to the interpolation output (P.beta.) for the .beta.-axis by an adder (4), making it possible to compensate for a corotation with respect to a desired gear ratio of the gears by which horizontal and vertical shafts of the .beta.-axis are coupled to each other.

Abstract: Method and apparatus for using deep ultraviolet excimer laser beams to dice semiconductor substrates, such as sapphire, with or without integrated circuitry, by establishing guided relative motion between the beam and the substrate to achieve ablative photodecomposition with the angle between the beam and the substrate being approximately five (5) degrees out of normal.

Abstract: A continuously emitted convergent laser beam is deflected by means of a rotating polygon mirror, to be directed to a reflector mirror having a pair of reflective surfaces, which adjoin each other at the vertex portion thereof. As the reflective surfaces of the reflector mirror are scanned with the laser beam, the beam is split and alternately directed to one mirror pair and the other mirror pair. The laser beam directed to each mirror pair is further divided into segment beams, which are reflected in opposite directions and condensed on a tipping paper sheet by means of condensing lenses. Thus, two alternate pairs of rows of perforations, four rows in total, are bored through the sheet.

Abstract: In an interconnection film cutting method and apparatus therefor according to the present invention, a laser beam having a pulse width of 10.sup.-9 second or less is illuminated on a desired portion of the interconnection pattern of a semiconductor device, such as a link used for redundant operation of a defective bit in, for example, a LSI memory, or on a desired portion of the interconnection pattern of a large-scaled interconnection substrate through a transmission type liquid crystal mask in the form of a desired pattern so as to cut the interconnection pattern without damaging a layer disposed below the interconnection pattern.

Abstract: In a laser beam relay unit for shifting the direction of a laser beam, two reflecting mirrors (31, 37) are placed in parallel to each other and at a predetermined angle relative to incident light, and are fixed to rotatable light guide members (33, 36), respectively. Reflecting-mirror holders (10, 20) are provided in the backs thereof with inlets for cooling air, air retaining sections, and outlets for discharging air. The reflecting mirrors are air-cooled and can be satisfactorily cooled due to the provision of the air retaining sections.

Abstract: A laser beam heat treatment for a metal wire has improved incidence and processing conditions so as to achieve efficient surface heat treatment with a circumferentially averaged laser beam flux and with remarkably enhanced fatigue strength in a high speed heat treatment. The method and apparatus is characterized by forming a cone shaped mirror of circular or polygon cross section having a peak angle in a range of 5.degree. to 20.degree. and interior mirror surface, the cone shaped mirror defining an opening having a diameter greater than the diameter of the metal wire in a range of 0.2 to 2 mm, feeding the metal wire having a diameter less than or equal to 1 mm through the cone shaped mirror along the center axis thereof, irradiating a laser beam with an incident angle including an angular deflection with respect to the center axis of the cone shaped mirror in a range of .+-.10.degree. resulting in multiple reflection of the laser beam between the interior mirror surface and the surface of the fed metal wire.

Abstract: A method for producing an object includes the steps of directing a laser beam to pass near a multiaxis table, supplying material from a material supply device to pass through and be melted by the laser beam, conveying the molten material to a prescribed location on the multiaxis table by allowing it to fall under its own weight or conveying it with a carrier gas, three-dimensionally controlling the position and attitude of the multiaxis table by means of a controller, and progressively depositing the molten material at prescribed locations on the multiaxis table for producing an object of a prescribed shape.

Abstract: A ram that is utilized in high speed apparatus for forming elongated one piece metal can bodies from shallow cups is constructed as a weldment in which there is an elongated relatively thin-walled tube, a tail piece metallurgically bonded to one end of the tube and a nose piece metallurgically bonded to the other end of the tube.

Abstract: A fixture for use in adjusting a laser type leveling instrument has a cradle mounted on a base and operative to support the instrument with its normally vertical axis disposed horizontally. A pentaprism is mounted on a rotable platform on the base to reflect a laser beam, emitted by an instrument in the cradle and impinging on the pentaprism, in a horizontal path. The rotatable platform for the pentaprism permits movement of the pentaprism from a first position in which the beam is directed forwardly and a second position in which the beam is reversed and reflected rearwardly.

Abstract: There is provided an NC laser device including a combination of a numerical control device and a laser oscillator. A laser output command is sent to an output control circuit at the time of starting and the laser output is monitored by a power sensor to obtain a ratio of the command value to a monitored value. This ratio is stored in a non-volatile memory, the difference between this ratio and the ratio obtained at a previous start is obtained, and if the difference is higher than a predetermined set value, indicative that an abnormality has occurred during the non-operative period of the device, an alarm is displayed on a display screen.

Abstract: A ski has better guide properties the sharper the corner areas of the steel edge profiles. Using a laser beam, the corner areas of the steel edge profiles are hardened on the ski.

Abstract: The invention relates to a process and apparatus for the welding of strips 1, 2 without a filler by means of a laser beam 6. To keep the gap width of the joint edges formed by the strips 1, 2 at the joint as small as possible, disposed downstream of the welding focus in the direction L in which the strips 1, 2 run is a cooling device 10, 11, the cooling intensity is controlled to a constant small gap width in dependence on the gap width measured immediately upstream of the welding focus, referred to the direction L.