Ricoh Company, Ltd.

Yuta Hiratsuka

Takashi Mori

Kenichiroh Hashimoto

Kaname Morita

Kaori Fujii

Kohzoh Urasaki

Yohsuke Kobayashi

Kohei Tsuzuki

Ryoji Okamoto

A metal member includes a first layer and a second layer. The second layer has an average crystal grain size different from an average crystal grain size of the first layer. An intermediate layer having an average crystal grain size smaller than the average crystal grain sizes of the first layer and the second layer is interposed between the first layer and the second layer.

Head diaphragm substrate, liquid discharge head, liquid discharge device, and liquid discharge apparatus

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

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Kanagawa, Japan

Yuta Hiratsuka