Abstract: An air spray gun comprising a nozzle with a frustoconically profiled tip, a cylindrical through bore, a V-shaped groove running across said through bore to form an oblong opening for ejecting paint under a pressure of 1 to 6Ckgf/cm.sup.2 and atomizing the ejected paint by compressed air having a pressure of 0.5 to 2 kgf/cm.sup.2, wherein an air cap is arranged to form an annular air outlet between the outer periphery of the nozzle tip and a central air outlet of the air cap and the nozzle tip is located within a front central through bore of the air cap.

Abstract: An image forming apparatus includes a laser beam scanning unit for scanning a recording medium in synchronism with a writing clock signal so that a dotted image is formed on the recording medium, a counter for carrying out a count operation in synchronism with the writing clock signal so that one count value or a plurality of count values determining a scanning area is/are obtained, a first controller for activating or inactivating the laser beam scanning unit based on one or the plurality of count values, a dip switch unit for specifying a dotting density, a second controller for controlling the frequency of the writing clock signal and/or a speed of scanning; and a changing unit for changing one or the plurality of count values, which should be obtained by the counter, based on the dotting density specified by the dip switch unit, so that the position of the scanning area with respect to the recording medium is constant even if the frequency of the writing clock signal and/or the scanning speed are changed

Abstract: Two or more crucibles containing different source materials to be vaporized are arranged concentrically, with their mouths open to a vapor chamber defined by an open top envelope within a vacuum housing. The vacuum housing is evacuated while the vapor chamber is held open. Then, with the vapor chamber closed, heat is applied to the crucibles as well as to the envelope to evaporate the source compounds within the crucibles. A substrate is held against the open top of the vapor chamber when the vapor pressure therein rises to a predetermined degree, thereby causing deposition of the vaporized source materials onto the substrate in the form of a crystalline compound film. As required, an impurity evaporator may also be provided within the vacuum housing for doping the compound film. The substrate having the crystalline compound film grown thereon may be moved from over the vapor chamber to a position over the impurity evaporator.

Abstract: Two or more crucibles containing different source materials to be vaporized are arranged concentrically, with their mouths open to a vapor chamber defined by an open top envelope within a vacuum housing. The vacuum housing is evacuated while the vapor chamber is held open. Then, with the vapor chamber closed, heat is applied to the crucibles as well as to the envelope to evaporate the source compounds within the crucibles. A substrate is held against the open top of the vapor chamber when the vapor pressure therein rises to a predetermined degree, thereby causing deposition of the vaporized source materials onto the substrate in the form of a crystalline compound film. As required, an impurity evaporator may also be provided within the vacuum housing for doping the compound film. The substrate having the crystalline compound film grown thereon may be moved from over the vapor chamber to a position over the impurity evaporator.

Abstract: A crawler-type lower machinery comprises a pair of crawlers, left and right, a main frame and a rocking beam both connecting the two crawlers together, an intermediate frame connecting the main frame with the rocking beam, a table mounted on the main frame, and two groups of lift means arranged at right angles to each other, one group being located between the main frame and the table and the other between the intermediate frame and the main frame. When traveling, the two crawlers are able to pitch and sway, independently of each other, along the ups and downs of the ground. The lift means are operable so that the inclination of the table with respect to the crawler-bearing ground surface can be adjusted in every direction.