Abstract: A head that moves across a surface of a mask, which includes a plurality of apertures for disposing conductive balls on a substrate, whereby, while the head is rotating about an axis that is perpendicular to the mask, the axis moves across the surface of the mask. The head includes a gatherer that gathers the conductive balls into a circular area that is smaller than the surface of the mask and disposed around a center of rotation of the head, the conductive balls being gathered from an area around the circular area when the head rotates.

Abstract: A method of mounting conductive balls comprises a step of setting, on a substrate, a mask that includes a plurality of apertures for disposing conductive balls on the substrate and a filling step. The filling step includes using a head that moves along a surface of the mask, holding a group of conductive balls in an area that is part of the surface of the mask, and moving the area so that parts of a path taken by the area overlap. By limiting the area where filling is carried out and moving the conductive balls while gathering the conductive balls in this area, it is possible to prevent losses for the conductive balls, to increase the filling efficiency, and to suppress the number of unfilled apertures.

Abstract: A method of mounting conductive balls comprises a step of setting, on a substrate, a mask that includes a plurality of apertures for disposing conductive balls on the substrate and a filling step. The filling step includes using a head that moves along a surface of the mask, holding a group of conductive balls in an area that is part of the surface of the mask, and moving the area so that parts of a path taken by the area overlap. By limiting the area where filling is carried out and moving the conductive balls while gathering the conductive balls in this area, it is possible to prevent losses for the conductive balls, to increase the filling efficiency, and to suppress the number of unfilled apertures.

Abstract: An output control method for a laser system comprised of a laser oscillator and a laser amplifier. The method enables the output energy to be stably controlled over a wide range, without changing the excitation energy, by controlling the delay (.tau.) of the excitation energy application timing of the laser oscillator with respect to the excitation energy application timing of the laser amplifier.