Abstract: A recording head includes a liquid ejecting outlet, a liquid passage communicating with the ejection outlet, and a heat generating resistor for supplying heat to the liquid in a heat acting portion in the liquid to create a bubble in the liquid passage to eject the liquid through the ejection outlet. A cross-sectional area of the liquid passage increases from the heat acting zone toward the ejection outlet, and this improves performance while also improving head durability.

Abstract: An ink jet head unit according to the present invention has an ink container which includes a plurality of absorbers and enables stable ink supply and reduces running cost. A volume Z of the absorber disposed near an ink supply port satisfies 3 V<Z<10 V, where V is the sum of a volume of a liquid passage, a volume of a common liquid chamber and a volume of the ink supply passage of the recording head.

Abstract: Provided is an ink, having a surface tension of not less than 30 mN/m and a viscosity of not more than 5 mpa.cndot.s, and comprising a water-soluble dye, water, at least one compound selected from the Compound Groups A and B, and at least one compound selected from the Compound Group C.

Abstract: An ink-jet recording apparatus has an ink container which has a plurality of defined chambers for containing ink and a detecting device which detects the residual ink quantity in the chambers. The detecting device has photosensors fixed in the recording apparatus which can detect the residual ink quantity in the chambers optically based on an amount of light passing through the chambers. As the ink container moves with a printhead carried by a carriage, the photosensors detect the residual ink quantities in the chambers one after another, whereby a simple detecting device for an ink container having multiple ink chambers can be provided.

Abstract: An ink container cartridge detachably mountable to an ink jet recording head, includes a main body of ink container cartridge; an ink retaining member, in the main body, for retaining the ink; wherein the ink retaining member is contained in the ink container cartridge so that a compression ratio A of the ink retaining member by a side having an ink supply opening of the ink container cartridge and a side opposite therefrom, and a compression ratio B by other two opposite sides thereof, satisfy A>B, and 1.1.ltoreq.A.ltoreq.1.6.

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink-supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: A liquid storing container, having a liquid feed portion for supplying liquid to a liquid injection recording apparatus, includes a rectangular receiving case for a porous member, and a filter that compresses the porous member. The liquid storing container provides for controlled feeding of liquid through a contact portion where the filter compresses the porous member, and a proper balance of air and liquid is achieved by symmetrical surfaces located within the receiving case.

Abstract: An ink jet head comprises parts for holding liquid ink, the parts being sealed with a moisture-curing sealant composed mainly of an organic high polymer compound having an alkoxysilane moiety represented by Formula (1) in the molecule thereof: ##STR1## where X is hydrogen, methyl, ethyl, propyl or halogen; R is methyl, ethyl or propyl; and n is 1, 2 or 3.

Abstract: A replaceable ink tank for an ink cartridge used in a bubble jet printer comprises a container formed by two side walls providing major surfaces of the container, and back, front, top and bottom walls. At least one ink supply port is provided in the bottom wall of container and is disposed for supplying ink from at least one ink chamber in the container to a corresponding ink tapping pipe in the ink cartridge. The container is configured for insertion into an opening in the top and front of the ink cartridge with the bottom wall of the container facing downward and a back wall facing a back wall of the ink cartridge, the container being constructed for engaging a camming shoe located at the back inside of a top wall of the cartridge and securing the container in place in the ink cartridge with the ink supply port connecting with the corresponding ink tapping pipe.

Abstract: An ink container includes a cylindrical member having a closed end and an opposite open end; and a flexible member covering the open end of the cylindrical member to define an ink containing portion. The flexible member has a bottom portion and a bent portion that is movable along an internal surface of the cylindrical member with consumption of the ink therein, wherein the bottom portion is less easily deformable than the bent portion and movement of the bent portion is irreversible.

Abstract: An air communicating hole and an opening circular in cross section are formed in the wall portions of the housing of the ink container. On the inner wall portion surrounding the opening is formed an ink inductive portion which is shaped in the form of an almost solid circular cylinder. The projected end of the ink inductive portion is provided with a cartridge filter as a first filter that forms a boundary with the porous material that works as an ink holding means. The ink inductive portion is virtually solid as a whole and has at least one fine hole formed in the solid portion in such a way that it extends longitudinally to communicate the opening to the interior of the housing where the porous material is installed. At the end of the solid portion of the ink inductive portion is formed a recess as a bubble removing means that removes air bubbles from ink being supplied to the ink jet recording head by retaining the bubbles in the recess.

Abstract: A liquid storing container employable for an ink jet recording apparatus includes a housing, a porous ink absorbing member received in the housing, and a first filter coming in contact with the ink absorbing member. The liquid storing container is detachably connected to an ink jet recording head having a second filter disposed in a liquid flow path thereof. The liquid storing container is constructed such that the volume between the first filter and the second filter, a size of each filter, a condition for compressively receiving the ink absorbing member in the housing, and an inner structure of the liquid storing container satisfactorily coincide with predetermined conditions.

Abstract: A liquid storing container employable for an ink jet recording apparatus includes a housing, a porous ink absorbing member received in the housing, and a first filter coming in contact with the ink absorbing member. The liquid storing container is detachably connected to an ink jet recording head having a second filter disposed in a liquid flow path thereof. The liquid storing container is constructed such that the volume between the first filter and the second filter, a size of each filter, a condition for compressively receiving the ink absorbing member in the housing, and an inner structure of the liquid storing container satisfactorily coincide with predetermined conditions.