Ricoh Company, Ltd.

Kohzoh Urasaki

Kenichiroh Hashimoto

Manabu Nishimura

Kouji Ohnishi

Kaori Fujii

Yuta Hiratsuka

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

A liquid ejection head includes a nozzle formation member having a liquid repellent layer disposed on a droplet ejection face of a nozzle substrate in which one or more nozzle orifices is formed to eject droplets. The liquid repellent layer includes a first sub-layer and a second sub-layer. The first sub-layer contains a higher proportion of low-molecular-weight molecules than the second sub-layer. The second sub-layer contains a higher proportion of high-molecular-weight molecules than the first sub-layer. Both the first sub-layer and the second sub-layer are exposed on a surface of the nozzle formation member.

Liquid ejection head, image forming apparatus employing the liquid ejection head, and method of manufacturing the liquid ejection head

A disclosed droplet discharging head includes: a common liquid chamber; a plurality of liquid flow paths branching from the common liquid chamber; a nozzle communicating with the liquid flow path; an actuator substrate having a heater disposed in the vicinity of the nozzle communicating with the liquid flow path; and an additional flow path on a surface above the liquid flow path in the vertical direction, the additional flow path communicating with the common liquid chamber.

Droplet discharging head, liquid cartridge, droplet discharging device, and image formation apparatus, configured with additional flow path connecting commom liquid chamber and liquid flow paths

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Hyogo, Japan

Kohzoh Urasaki