Ricoh Company, Ltd.

Ryohta Yoneta

Takahiro Yoshida

Toshiaki Masuda

Takuma Hirabayashi

Hiromichi Hirano

A liquid discharge head having a nozzle substrate including a nozzle from which a liquid is discharged in a liquid discharge direction, a pressure chamber communicating with the nozzle, a diaphragm defining a part of wall of the pressure chamber, and a pressure generator on a first surface of the diaphragm opposite to a second surface of the diaphragm facing the pressure chamber, the pressure generator configured to deform the diaphragm. A gap between a first line and a second line is 40 μm or less in a direction perpendicular to the liquid discharge direction, where the first line extends, in the liquid discharge direction, from a displacement center at which the diaphragm deforms with a maximum displacement amount, and the second line extends from a central position of the nozzle in the liquid discharge direction.

Liquid discharge head, head module, head device, liquid discharge device, and liquid discharge apparatus

A liquid discharge apparatus includes a plurality of heads configured to discharge a liquid, a supply channel connected to the plurality of heads, the supply channel configured to supply the liquid to the plurality of heads, a collection channel connected to the plurality of heads, the collection channel configured to collect the liquid from the plurality of heads, a supply damper configured to define a deformable wall of the supply channel, a collection damper configured to define a deformable wall of the collection channel, a supply damper chamber facing the supply damper, a collection damper chamber facing the collection damper, a pressure pump configured to apply a pressure to the supply damper chamber, and a depressurize pump configured to apply a negative pressure to the collection damper chamber.

Liquid discharge apparatus

A liquid discharge apparatus includes a liquid container and a liquid discharge head. The liquid container is configured to contain liquid. The liquid discharge head is configured to discharge the liquid. The liquid discharge head includes a nozzle row in which a plurality of nozzles are aligned. The nozzle row includes a first region in which nozzles are aligned at a first nozzle pitch, a second region in which nozzles are aligned at a second nozzle pitch larger than the first nozzle pitch, and a third region in which nozzles are arranged at a third nozzle pitch smaller than the first nozzle pitch. A volume of the liquid discharged from the second region is larger than a volume of the liquid discharged from the first region. A volume of the liquid discharged from the third region is smaller than the volume of the liquid discharged from the first region.

Liquid discharge apparatus and image forming method

A liquid discharge head includes a plurality of nozzles from which a liquid is discharged in a gravity direction, a plurality of pressure chambers communicating with the plurality of nozzles, respectively, a common channel communicating with each of the plurality of pressure chambers, the common channel including a top surface and a bottom surface disposed below the top surface in the gravity direction, and a plurality of convex portions formed on the bottom surface of the common channel.

Liquid discharge head, liquid discharge device, and liquid discharge apparatus

A liquid discharge head, includes a plurality of nozzles from which a liquid is discharged, a plurality of individual-liquid-chambers that communicate with the plurality of nozzles, a supply-side common-liquid-chamber to supply the liquid to the plurality of individual-liquid-chambers, a plurality of drainage channels that communicate with the plurality of nozzles, a drainage-side common-liquid-chamber to drain the liquid in the plurality of drainage channels, a supply-side filter disposed upstream from the plurality of nozzles in a liquid flow direction in which the liquid flows through the liquid discharge head; and a drainage-side filter disposed downstream from the plurality of nozzles in the liquid flow direction.

A liquid discharge head includes nozzles configured to discharge liquid droplets; individual flow paths to which the nozzles are connected; a liquid injection unit connected to the individual flow paths; a common liquid room configured to supply liquid to the individual flow paths; and a filter unit configured to filter the liquid. The filter unit is provided between the common liquid room and the liquid injection unit. The filter unit includes a reinforcement area for dividing the filter unit into filter areas each corresponding to two or more of the individual flow paths. A partition wall is provided corresponding to the reinforcement area of the filter unit, on the liquid injection unit side. A width in a nozzle arrangement direction of the partition wall is wider than a width in the nozzle arrangement direction of the reinforcement area.

Liquid discharge head and image forming apparatus

A liquid ejection head includes a plurality of nozzles to eject liquid drops; a plurality of individual liquid chambers communicating with the plurality of nozzles; a plurality of liquid inlet portions leading to the plurality of individual liquid chambers; a common liquid chamber to supply liquid to the plurality of individual liquid chambers; and a plurality of filter portions disposed between the common liquid chamber and the liquid inlet portions, each of the filter portions including filter holes and filtering the liquid, wherein a plurality of reinforcement parts are provided to partition the plurality of filter portions, each of the reinforcement parts includes a part facing some of the filter holes of a corresponding one of the plurality of filter portions in a liquid flow direction, with a gap between the filter holes and the reinforcement part.

Liquid ejection head and image forming device

A liquid discharge head includes nozzles discharging liquid droplets; liquid chambers in communication with the nozzles; liquid supply paths in communication with the individual liquid chambers; and a common liquid chamber in communication with the liquid supply paths. Further, liquid is supplied from a direction from the common liquid chamber to the liquid supply paths, the direction crossing a direction of liquid flowing in the liquid supply paths, and in a wall surface of the common liquid chamber on a side closer to the individual liquid chambers, an inclined surface is formed in a direction orthogonal to a nozzle array direction in a manner that the common liquid chamber gradually expands as the common liquid chamber approaches the liquid supply paths.

A liquid discharge head includes a nozzle plate, a channel plate, a wall member, and a common liquid chamber. The nozzle plate includes nozzles, and the channel plate forms a plurality of individual channels communicating with the nozzles. The wall member forms at least one portion of a wall of the plurality of individual channels. The common liquid chamber, arranged at a side opposite the plurality of individual channels, supplies liquid to the individual channel. The wall member includes a deformable damper area, a reinforced area, and an area of reduced thickness. The damper area forms one portion of a wall of the common liquid chamber, and the reinforced area divides the damper area into plural areas. The area of reduced thickness, arranged in at least one portion of the reinforced area, has a thickness greater than the damper area and less than the reinforced area.

A liquid ejection head includes nozzles ejecting liquid droplets; individual liquid chambers in communication with the nozzles; liquid supply paths in communication with the individual liquid chambers; a common liquid chamber storing liquid to be supplied to the liquid supply paths; filter members disposed between the common liquid chamber and the respective liquid supply paths, the filter members including filter regions to filter the liquid; and one or more dividing wall sections, each disposed between the liquid supply paths. Further, the filter region of the filter member is bonded to the one or more dividing wall sections and the outer peripheral parts with adhesive and the filter region of the filter member is bent in a direction opposite to a direction in which liquid flows from the common liquid chamber to the liquid supply paths.

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Tokyo, Japan

Ryohta Yoneta