Abstract: At a transmitting end, first and second dipole antennas are crossed each other by right angles and are arranged in a plane perpendicular to a propagating direction of radio wave. In first and second balanced modulators, a carrier signal is modulated with respective modulation signals having a phase difference of 90.degree. to produce balanced-modulated signals, which are then supplied to the first and second dipole antennas, respectively. Then a plane of polarization of a composite vector of radio waves transmitted by the dipole antennas is rotated at a frequency of the modulation signals, said frequency being higher than a fading frequency. The modulation signals are controlled by a state of a digital signal to be transmitted. At a receiving end, the digital signal is reproduced by receiving the transmitted radio wave by a conventional single side band receiver.

Abstract: A circuit board comprises a rigid metal substrate, a conductive metal layer formed into a predetermined circuit pattern, and a resinous layer interposed between the metal substrate and the metal layer for electrically insulating and bonding the metal substrate and the metal layer, the conductive metal layer having an elongation at break of not less than 15%, and the resinous layer comprising a first resinous layer having a volume resistivity of not less than 10.sup.10 .OMEGA.. cm, and a second resinous layer having an elongation at break of not less than 100%. The circuit board has a desired dielectric strength between the metal substrate and the conductive metal layer and can be bent without resulting disconnection in the metal layer or the like.

Abstract: This invention relates to a device for detecting the amount of deviation of the optical axis of laser beams from a predetermined point at which a workpiece is to be processed in a laser processing apparatus.The detector includes a laser resonator, a device for transferring the workpiece in the direction of both the X- and Y-axes, a base plate detachably mounted onto the workpiece transferring device, a plurality of image sensors disposed radially around the predetermined point located on the upper surface of the base plate, and a device for displaying the optical axis of the laser beams irradiated from the laser resonator to at least three of the plurality of image sensors, whereby the workpiece may be transferred so that the optical axis of the laser beams coincides with the predetermined point at which the workpiece is to be processed.

Abstract: The present invention relates to an adjustable laser and optic system for processing which includes a laser beam cutting machine for focusing a laser beam including a first base for supporting an overhead beam by a post, the overhead beam having a laser beam conduit, a mirror assembly and a condenser lens for focusing the laser beam. A laser generator is supported on a second base for generating and feeding the laser beam to the laser cutting machine. Thg laser generator has a laser beam outlet arranged in alignment with the axis of the beam conduit in the overhead beam such that the laser beam generated is delivered to the mirror assembly in a straight line. Also provided is an element for connecting the first base and the second base, and an adjustment device associated with the second base for horizontally adjusting the laser generator in relation to the cutting machine, and a workpiece positioning device mounted on the first base for feeding the workpiece to the processing zone.

Abstract: This invention relates to a method and device for detecting the focusing position in a laser processing apparatus, such as a machine for cutting plate-shaped workpieces by laser beams.The method includes the steps of placing a light shielding member and a light sensor in a path of laser light beams irradiated through a condenser lens to the workpiece to be processed; moving at least either one of the light shielding member and light sensor along the optical axis of the laser beams; and detecting the position at which electrical output of the light sensor becomes either a minimum or a maximum; whereby the focusing position is determined.

Abstract: The present invention relates generally to a laser beam machine for cutting sheet metal workpieces and more particularly to a dust collecting apparatus therefor. The apparatus comprises a first filter chamber in which a bucket and an air filter are provided beneath a working area, a second filter chamber in which a liquid filter is communicated with a vacuum pump, and a device for introducing fumes into the liquid filter from the first filter chamber through the air filter. An aspirator is positioned between the working area and the first filter chamber for the purpose of sucking the fumes into the first filter chamber. The aspirator may include a venturi tube. The first filter chamber provides an ancillary bed on the bottom thereof for molten metal slag. The second filter chamber provides a bubble breaker and a moisture separator.

Abstract: The present invention relates to a laser processing machine. A table supports a workpiece to be processed at a work area. A processing head assembly is arranged above the table. A nozzle is connected at a lower end of the processing head assembly and applies a laser beam to the workpiece together with an assisting gas at the work area. A device is provided at the work area for supplying air to keep the workpiece to be processed afloat while the laser beam is being applied to the workpiece together with the assisting gas. A similar device is provided at the lower end of the processing head assembly for supplying air to keep the workpiece to be processed from going up into contact with the processing head assembly while the laser beam is being applied to the workpiece together with the assisting gas. These devices for supplying air include a plurality of air chambers.

Abstract: The present invention relates to a laser machine having a head assembly for processing a workpiece. A lens is disposed in the head assembly for condensing a laser beam and a nozzle is arranged beneath the lens for applying the laser beam to the workpiece. A device is connected in the head assembly for vertically moving the lens and the nozzle together in fixed relation to each other. The device includes an adjustable motor. Also, the nozzle is detachably mounted onto a lower end of the head assembly. Furthermore, the laser machine comprises an arrangement for counterbalancing the weight of the nozzle as well as shock absorbers for handling vibrations caused by vertical movement of the lens and the nozzle.