Abstract: A liquid discharge head includes recording liquid flow paths communicated with plural discharge ports, a flow path formation member, upstream of the recording liquid flow paths, on which a recording liquid supply passage is provided, a recording liquid storing member, upstream of the recording liquid supply passage, in which a common liquid chamber is provided, a plug member for supplying recording liquid from the outside into the common liquid chamber, and a porous member at the end portion of the flow path formation member to remove dust particles and the like in recording liquid supplied from the common liquid chamber to the recording liquid supply passage. The porous member is arranged above a bottom face of the common liquid chamber.

Abstract: A head chip and a recording liquid storing unit are bonded through a sealing member. The head chip comprises a recording element base plate, and a flow path formation member provided with a bonding face and a supply hole. The frame member of the recording liquid storing unit is formed by a single member, which is provided with a recording liquid storing chamber, one side face of which forms a totally open portion. The shape of the opening portion is equal to the sectional shape of the recording liquid storing chamber. For the flat portion of the sealing member, there are formed a hole portion, the circumferential first face-side ribs that surround it, and the second face-side ribs, which are exactly symmetrical to the first face-side ribs, with the flat portion between them. These ribs are compressed and held by both bonding faces. An inner extrusion of the rib on the flat portion is fitted into the position hole of the bonding face.

Abstract: A liquid supply device for supplying liquid to a recording head is disclosed. The device includes a liquid container for holding liquid to be supplied to the recording head, a first connecting portion for connecting the recording head and the liquid container, and a second connecting portion having one end thereof in the liquid container, and the other end being open to the air outside and positioned lower in height than the liquid discharge port of the recording head. The device is capable of adjusting negative pressure against the nozzle of the recording head to prevent ink leakage without depending on the deformation of an ink bag.

Abstract: A recording element substrate has a plurality of recording elements are provided, a wiring sheet is provided at a position to surround a periphery of the recording element substrate to transmit a recording signal to the recording element substrate, a wiring substrate is electrically connected to one end portion of the wiring sheet to input a recording signal from an exterior, and a flow path forming member supplies recording liquid to the recording element substrate. When the flow path forming member is joined to a frame body having a common liquid chamber, in a state in which the an end of the wiring substrate is supported by the flow path forming member, a liquid jet recording head is held due to opposing both end portions of another end portion of the wiring substrate being respectively inserted and engaged with a set of engaging grooves provided at the frame body.

Abstract: A recording element substrate has a plurality of recording elements are provided, a wiring sheet is provided at a position to surround a periphery of the recording element substrate to transmit a recording signal to the recording element substrate, a wiring substrate is electrically connected to one end portion of the wiring sheet to input a recording signal from an exterior, and a flow path forming member supplies recording liquid to the recording element substrate. When the flow path forming member is joined to a frame body having a common liquid chamber, in a state in which the an end of the wiring substrate is supported by the flow path forming member, a liquid jet recording head is held due to opposing both end portions of another end portion of the wiring substrate being respectively inserted and engaged with a set of engaging grooves provided at the frame body.

Abstract: A liquid discharge head comprises recording liquid flow paths communicated with plural discharge ports for discharging liquid droplets; a flow path formation member on the upstream of the recording liquid flow path on which a recording liquid supply passage for supplying recording liquid to the recording liquid flow path is provided; a recording liquid storing member on the upstream of the recording liquid supply passage on which a common liquid chamber for containing recording liquid to be supplied to the recording liquid supply passage is provided; a plug member for supplying recording liquid from the outside into the common liquid chamber; and a porous member held at the end portion of the flow path formation member to remove dust particles and others in recording liquid supplied from the common liquid chamber to the recording liquid supply passage. In this liquid jet recording head, the porous member is arranged above a bottom face of the common liquid chamber.

Abstract: A head chip and a recording liquid storing unit are bonded through a sealing member. The head chip comprises a recording element base plate, and a flow path formation member provided with a bonding face and a supply hole. The frame member of the recording liquid storing unit is formed by a single member, which is provided with a recording liquid storing chamber, one side face of which forms a totally open portion. The shape of the opening portion is equal to the sectional shape of the recording liquid storing chamber. For the flat portion of the sealing member, there are formed a hole portion, the circumferential first face-side ribs that surround it, and the second face-side ribs, which are exactly symmetrical to the first face-side ribs, with the flat portion between them. These ribs are compressed and held by both bonding faces. An inner extrusion of the rib on the flat portion is fitted into the position hole of the bonding face.

Abstract: A liquid supplying device for supplying liquid to a recording head for discharging liquid comprises a liquid container for containing liquid to be supplied to the recording head, a first connecting portion for connecting the recording head and the liquid container, and a second connecting portion having one end thereof in the liquid container, and the other end thereof being open to the air outside. For this ink supplying device, the one end of the second connecting portion connected with the liquid container is positioned lower than the height of liquid discharge port of the recording head, and an interface between liquid and the air outside exists in the second connecting portion, and by the surface tension of meniscus formed on the interface, negative pressure is generated against the liquid discharge port of the recording head.