Mitsubishi Denki Kabushiki Kaisha

Hiromu Narumiya

Hiroshi Fukumoto

Jyunichi Aizawa

Masahiro Sugihara

Masayuki Kakuda

Tadashi Kimura

Tsutomu Inaba

Etsuo Morishita

Kunihiko Nakagawa

Hirohumi Matsuo

The particle diameter of droplets is controlled without improvements on a nozzle plate. An ultrasonic wave causes a radiation pressure to be intermittently applied to an opening in a cycle having a period shorter than the fundamental vibration period of a liquid surface in the opening. A high-order standing wave is then generated at the liquid surface in the opening to cause a plurality of droplets to be emitted simultaneously. Since the plurality of droplets are simultaneously emitted from a plurality of mounds of the high-order standing wave, the droplets have a diameter smaller than the diameter of the opening and are emitted vertically upwardly. The diameter of the droplets is controlled by the order of the high-order standing wave to be generated. The order of the standing wave is increased by shortening the period for which the radiation pressure is applied to the opening.

Liquid ejector which uses a high-order ultrasonic wave to eject ink

A liquid ejector increases the density of acoustic energy to eject droplets efficiently. Acoustic waves are introduced in generally planar form from a piezoelectric transducer into a liquid ink in a reservoir and are reflected from a reflecting wall of the reservoir. The reflecting wall defines a parabola in cross section. An ejection opening is located near a focal point of the parabola, opposite the transducer. The acoustic waves focus at the ejection opening, increasing the density of the acoustic energy in the ink at the ejection opening. Thus, ink droplets are ejected efficiently from the ejection opening.

Acoustic liquid ejector and printer apparatus incorporating the ejector

A scroll-type apparatus having a main journal bearing which journals the drive shaft of the apparatus and is capable of pivoting by small angles with two degrees of freedom. The main journal bearing comprises three or more arcuate pads whose inner surfaces journal the drive shaft and which are pivotably supported by a stationary main bearing housing. In a preferred embodiment, each of the pads has a spherical protrusion and two rotation-preventing pins secured to its back surface. The protrusions contact the inner surface of the main bearing housing and pivotably support the pads, while the rotation-preventing pins are inserted into grooves formed on the inner surface of the main bearing housing. When a load is applied to the drive shaft causing it to tilt, the pads of the main journal bearing can tilt along with the drive shaft by pivoting about the points of contact between the spherical protrusions and the inner surface of the main bearing housing, thereby preventing edge loading of the main journal bearing.

Scroll-type apparatus having a pivoting main journal bearing

Growing community of inventors

Tokyo, Japan

Hiromu Narumiya