Abstract: The object of the present invention is to provide a molded plastic article having high accuracy. To attain this object, the present invention provides a method of manufacturing a column or panel shaped molded plastic article having a desired molding shape on at least the circumference face of said molded plastic article comprising; manufacturing a column or panel shaped mother mold by using a material having high rigidity and heat resistance, the circumference face of said mother mold has a shape corresponding to the molded shape of the circumference face of said molded plastic article, manufacturing a cylindrical or ring shaped glass mold by the glass molding method, the inside face of which has a shape transferred from said shape of the circumference face of said mother mold, and molding a molded plastic article, circumference face of which as a shape transferred from said shape of the inside face of said resulting glass mold.

Abstract: A picture recording apparatus having an endless dielectric belt with a plurality of spaced apart poles thereon has a multiple stylus electrode assembly in contact with an inner surface of the belt. Magnetic fluid or magnetic powder is applied to the belt to form magnetic rise elements on the belt and these rise elements are transferred to a recording sheet thus forming dots thereon by an electrostatic force generated by the assembly electrodes in response to an input signal.

Abstract: An ink jet printer which does not utilize high voltage potentials to deflect non-printing ink particles. Nozzles are arranged in two parallel lines to jet ink particles. These ink particles pass between first and second parallel electrodes disposed between the nozzles and a recording medium. The non-printing ink particles from both lines of nozzles are charged with the same polarity. The repulsive force between the two lines of particles and the induced charges in the electrodes force the non-printing ink particles towards the electrodes. In one embodiment, the electrodes are solid plates and a gutter is provided between ends of the plates and the recording medium to recover ink particles, while in a second embodiment, the electrodes are metal meshes and a suction device is provided behind the meshes to collect the non-printing ink particles.

Abstract: An ink droplet charging device and method in which ink droplets are alternately charged positive, negative and with zero charges to prevent the accumulation of foreign particles upon charging electrodes. A nozzle jets an ink stream which is divided into ink droplets. A charging electrode disposed at the position where the ink stream divides into the droplets controls the charge condition of the ink droplets according to whether the ink droplets are utilized for printing or not. Positive, negative and ground level voltages are applied to the charging electrode in synchronization with the formation of the ink droplets.

Abstract: An ink jet printer in which ink particles separated from an ink jet at positions shifted from the normal charging electrode position are maintained charged at all times thereby preventing the separated particles from reaching the recording medium and being displaced thereon as moise. Auxiliary charging electrodes are provided adjacent the charging electrodes which control the charging of the ink particles according to a printing signal. The auxiliary charging electrodes can be provided as first and second sets of electrodes disposed on either side of the charging electrodes or as a continuous set of plates running from a position near the nozzles past the charging electrodes.

Abstract: Means are disclosed for degassing a liquid ink used in an ink drop printer. The printer is the type wherein continuously generated drops are directed to a target with some being diverted from a path intersecting the target to a path intersecting a collection device or gutter. The collected liquid is recycled. The degassing is achieved by holding the gas pressure above the liquid ink in a closed supply vessel below the ambient atmospheric pressure. In addition, the liquid ink in the supply vessel is heated. The low gas pressure and elevated ink temperature reduces the quantity of gas dissolved in the ink and thereby prevents the formation of gas bubbles in the printer system.

Abstract: In a scanning electron microscope, an objective lens field is generated between a pair of deflecting coils and a specimen by an objective lens having upper and lower magnetic pole pieces. A supplemental magnetic pole piece is installed between said upper and lower magnetic pole pieces so that the half width of the objective lens axial magnetic field distribution is increased and the principal plane of the objective lens is positioned near the lower pole piece. By so doing, the spherical aberration coefficient of the objective lens is reduced and a high resolution scanning image is obtained.