Ricoh Company, Ltd.

Kouji Ohnishi

Manabu Nishimura

Kaichi Ueno

Takahiko Kuroda

Toshiroh Tokuno

Michio Umezawa

Kunihiro Yamanaka

Shuya Abe

Kaihei Isshiki

Kohzoh Urasaki

A liquid drop ejecting head includes a a nozzle plate to form nozzles, a liquid chamber substrate including one surface bonded to the nozzle plate and forming liquid chambers provided for the nozzles and communicating with the nozzles, a diaphragm bonded to the other surface of the liquid chamber substrate to form a part of each liquid chamber, and a pressure generating unit giving pressure oscillation to the diaphragm in accordance with a liquid drop eject signal to exert pressure on a liquid in each liquid chamber through the diaphragm. In the liquid drop ejecting head, a protection film is formed on an inner side wall of each liquid chamber by a chemical reaction of fluorocarbon and silicon fluoride oxide of a by-product formed on the inner side wall of the liquid chamber with the formation of the liquid chambers in the liquid chamber substrate.

Liquid drop ejecting head, image forming device, and method of manufacturing liquid drop ejecting head

An actuator element includes an electrode film; and an insulation film layered on the electrode film including a through hole for connecting a wiring which is formed on the insulation film to the electrode film. A shape of a rim of the through hole is either a closed curve free of corners or a polygon with vertex angles which are larger than 90 degrees.

Actuator element, liquid drop discharge head, liquid drop discharge apparatus and image forming apparatus

This patent specification describes a droplet-ejecting head including a nozzle substrate having a plurality of nozzles for ejecting droplets, and an actuator configured to be driven to generate energy for ejecting droplets through each nozzle. The nozzle substrate is cleaned by a cleaning liquid containing microbubbles before being bonded to another member.

Method and droplet-ejecting head for droplet-ejecting recording apparatus capable of achieving high recording image quality

An ink-jet head includes a nozzle which discharges an ink drop to a recording medium. A discharging chamber communicates with the nozzle and contains ink therein. An oscillation plate is provided on a first substrate of silicon, the oscillation plate defining a bottom surface of the discharging chamber, the oscillation plate pressurizing the ink in the discharging chamber when the oscillation plate is actuated. An electrode is provided on a second substrate of silicon, the electrode facing the oscillation plate via a gap between the oscillation plate and the electrode. In the ink-jet head, at least one of a first bonding area of the first substrate and a second bonding area of the second substrate is provided with a silicon oxide film, and the silicon oxide film contains boron on a surface thereof where the first substrate and the second substrate are bonded together.

Growing community of inventors

Hyogo, Japan

Kouji Ohnishi