Ricoh Company, Ltd.

Kaori Fujii

Satoru Tobita

Kenichiroh Hashimoto

Kohzoh Urasaki

Yuta Hiratsuka

Masayuki Kinoshita

A liquid ejection head is disclosed. The liquid ejection includes a flow channel plate, the flow channel plate being formed from one thin plate, the flow channel plate being formed with one or more pressure generating chambers, a fluid resistance section which supplies liquid to the pressure generating chamber, and a nozzle hole which opposes the pressure generating chamber. The flow channel plate is made of a metal material, and wherein the flow plate includes the pressure generating chamber which is formed of a groove-shaped indentation; the nozzle hole which is formed at one end in a longitudinal direction of the groove-shaped indentation; and the fluid resistance section which is formed at the other end in the longitudinal direction of the groove-shaped indentation. The pressure generating chamber, the nozzle head, and the fluid resistance section are formed such that they deform the thin plate in a thickness direction.

Liquid ejection head including flow channel plate formed with pressure generating chamber, method of manufacturing such liquid ejection head, and image forming apparatus including such liquid ejection 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 liquid jet head includes a nozzle member having plural nozzles for jetting a liquid therefrom, a flow path member forming at least a part of a liquid chamber communicating with each of the plural nozzles, and a pressure generating part for generating pressure that is applied to the liquid inside the liquid chamber. The nozzle member and the flow path member are each formed by a metal material. The metal material of the nozzle member has substantially the same composition as the metal material of the flow path member. The metal material of the nozzle member includes crystal particles having an average particle diameter which is less than that of the crystal particles included in the metal material of the flow path member.

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Kanagawa, Japan

Kaori Fujii