Abstract: To discharge a liquid from each of liquid discharge flow paths without being affected by an operating state of the other liquid discharge flow paths, a liquid-jet head chip includes: an actuator substrate including a plurality of discharge grooves each being open on one surface of the actuator substrate, and the plurality of discharge grooves being formed in parallel at a distance from each other; a cover plate substrate including a common ink chamber being open on a surface of the cover plate substrate on a side opposite to the actuator substrate and a plurality of slits extending from the common ink chamber to be in communication with the discharge grooves; and a filter having a flat surface at an approximately constant distance from ends of all the slits, the structure being located at a position at which an opening of the common ink chamber is substantially closed.

Abstract: An ink jet head has a plurality of individual head chips integrated to form a head chip block. Each head chip has a plurality of grooves, and the grooves of all the head chips open at one end to respective nozzle holes formed in a nozzle plate. Each head chip has an actuator substrate in which is formed an ink chamber that supplies ink to the grooves in that head chip. An ink flow path connects an ink supply to one of the ink chambers in one of the head chips, and the ink chambers of all the head chips communicate with one another through ink holes. Since ink is supplied to the grooves of all the head chips from a single ink flow path connected to the ink supply, the size of the ink jet head, particularly in the thickness direction, the weight, the number of parts and the manufacturing cost can all be reduced.

Abstract: Provided is a head chip (41) including: a pair of piezoelectric elements that hold a liquid jet channel therebetween; a common electrode formed on a surface of each piezoelectric element on the liquid jet channel side; and a drive electrode formed on an opposite surface of the piezoelectric element, in which: a cover plate (16) is joined so as to cover a common terminal (19a) connected to the common electrode; an integrated wiring (70) that integrates all of the common terminals (19a) is formed on a surface of the cover plate (16); the integrated wiring (70) is connected to the common terminals (19a) through the contact plugs (75) formed in through-holes (74) of the cover plate (16); and integrated terminals (19d) connected to the integrated wiring (70) and drive terminals (19b) connected to the drive electrodes are arranged in line at an end of an actuator plate (15).

Abstract: To prevent an adhesive from flowing into nozzle, there is provided a head chip including: an actuator plate having a plurality of grooves; a drive electrode formed on each side wall of the grooves; a cover plate which has an introduction aperture; a nozzle plate fixed to an end surface of the actuator plate through an adhesive, and has a plurality of nozzles which communicate with the of grooves, respectively; and a number of escape holes formed between the nozzle plate and the actuator plate, corresponding to the nozzles, in which each escape hole has a contour which surrounds a periphery of each nozzle with the contour being spaced apart from a contour of each nozzle by at least a given distance, and in which the adhesive remaining at a time of fixing the nozzle plate is accumulated in the escape holes.

Abstract: To prevent an adhesive from flowing into nozzles, there is provided a head chip includes: a plate having a plurality of grooves; a cover plate having an introduction aperture; a nozzle plate fixed to an end surface of the plate, and has nozzles formed at the same intervals; and escape holes formed between the nozzle plate and the plate, each have a contour which surrounds a periphery of each of the nozzles with the contour being spaced apart from a contour of each of the nozzles by at least a given distance, accumulate the adhesive remaining at a time of fixing the nozzle plate therein, and allow the nozzles and the grooves to communicate with each other. The nozzles and the escape holes are so arranged as to be displaced from adjacent nozzles and adjacent escape holes by a given distance in a vertical direction of the nozzle plate.

Abstract: An inkjet head capable of achieving stable ejection of ink by preventing air bubbles from being left in the upstream side of a nozzle of a filter element such as mesh filter that is provided in an inkjet head owing to the efficient use of the open area of the filter element. The inkjet head is provided to have a fluid channel communicated with the atmosphere from the upstream side region of the filter element such as mesh filter, with regard to the nozzle without passing through the filter element and the nozzle.

Abstract: To achieve a uniform ink discharge speed, there is provided an head chip including a plurality of channels partitioned with piezoelectric elements and formed parallel to each other, in which: the channels include a discharge channel disposed in a middle portion of the channels in a channel parallel direction and a dummy channel disposed in each of both end portions of the channels in the channel parallel direction; the discharge channel communicates with an ink chamber via an ink introduction hole and with the nozzle hole; one of discharge of the ink droplet from the dummy channel toward the recording medium and supply of the ink from the ink chamber to the dummy channel is interrupted; and one of the piezoelectric elements which is adjacent to the discharge channel, and one of the piezoelectric elements which is adjacent to the dummy channel are each applied with a voltage.

Abstract: Provided is an inkjet head chip including: an ink chamber for containing ink; a plurality of piezoelectric elements deformable by applying a voltage; a plurality of channels partitioned with the plurality of piezoelectric elements and formed parallel to each other; a nozzle hole disposed in one end of the channel in a longitudinal direction, for discharging an ink droplet toward a recording medium; and an actuator plate including the plurality of channels formed therein, in which: the actuator plate has a structure in which at least a piezoelectric layer and a low-permittivity substrate layer are laminated together, the piezoelectric layer being formed of a piezoelectric material forming the plurality of piezoelectric elements, the low-permittivity substrate layer being formed of an insulating low-permittivity material having a lower permittivity compared with the piezoelectric material; and the insulating low-permittivity material is exposed on bottom surfaces of the plurality of channels.

Abstract: In order to provide an inkjet head easily manufactured while saving material costs and processing costs, and a manufacturing method for the same, an inkjet head comprises a first piezoelectric substrate which includes a plurality of first groove portions formed on one surface thereof and an ink supply path which is connected to the plurality of first groove portions and opens toward another surface thereof. A second piezoelectric substrate is bonded to the first piezoelectric substrate and includes a plurality of second groove portions forming ink chambers together with the plurality of first groove portions on a bonding surface between the first piezoelectric substrate and the second piezoelectric substrate. Drive electrodes are formed on side walls of the first groove portions and side walls of the second groove portions.

Abstract: Provided is an ink-jet head and an ink-jet type recording apparatus for improving an impact position accuracy of ink droplets by eliminating a discharge speed difference of ink droplets when an ink volume is changed gradually in a plurality of steps to perform gradation expression. Among discharge pulse signals to be applied a plurality of times for gradually changing and discharging the ink droplet volume, a signal waveform of a final drive pulse and a signal waveform of an initial drive pulse to be operated at least once before the final drive pulse, are varied from each other so as to establish a predetermined relation therebetween.

Abstract: Provided area head chip unit capable of discharging a plurality of kinds of ink, down sizing, and of printing by the plurality of kinds of ink. A head chip unit includes a head chip having a substantially plate shape including: a channel extending from one edge side to another edge side to be opened on the another edge side; and an ink chamber formed in an arrangement direction orthogonal to a supply direction for forming the channel and communicating with the channel on the one edge side, the head chip being laminated in multiple.

Abstract: An ink-jet print head has a piezoelectric ceramic plate having grooves for receiving ink, a nozzle plate connected to the piezoelectric ceramic plate and having nozzle apertures each disposed in communication with respective ones of the grooves, and an ink storing device for storing ink. An ink chamber plate is connected to the piezoelectric ceramic plate and has an ink chamber for supplying ink from the ink storing device to the grooves. A base plate is connected to a side of the ink chamber plate and has an ink reservoir defining a portion of an ink flow path for transporting ink from the ink storing device to the ink chamber of the ink chamber plate. The ink reservoir has at least one tapered portion progressively diverging in a direction toward the ink chamber of the ink chamber plate.

Abstract: A small, light ink jet head that is constituted by employing a laminated head chip is provided at a low price. According to the present invention, through holes are formed in a plurality of head chips, for a head chip block, for which independent ink flow paths are not provided, or for which guide holes are formed in the side faces of the head chips. With this arrangement, ink that is guided from an ink flow path can be supplied to all the head chips that constitute the head chip block.

Abstract: An inkjet head capable of achieving stable ejection of ink by preventing air bubbles from being left in the upstream side of a nozzle of a filter element such as mesh filter that is provided in an inkjet head owing to the efficient use of the open area of the filter element. The inkjet head is provided to have a fluid channel communicated with the atmosphere from the upstream side region of the filter element such as mesh filter, with regard to the nozzle without passing through the filter element and the nozzle.

Abstract: To provide an ink jet head and an ink jet recording apparatus in which it is possible to reliably prevent ink bubbles from staying in the ink sump and the interior of the head chip and in which it is relatively easy to remove the bubbles. The ink jet head includes: a plurality of grooves arranged side by side so as to communicate with nozzle openings; an ink chamber for supplying ink to each of the grooves; an ink sump provided so as to communicate with the ink chamber; and ink storage unit (50) communicating with the ink sump through ink supply passages, in which there is provided an air duct (100) establishing communication between a region in the ink sump which is substantially free from interference with an ink flow from the ink supply passages (33) to the ink chamber and in which bubbles easily gather and an air region of the ink storage unit (50). Therefore, the bubbles in the ink can be surely removed.

Abstract: Providing an ink-jet print head and ink-jet recording apparatus capable of preventing the dwell of air bubbles contained in ink and relatively easily removing the air bubbles. In an ink-jet print head 10 comprising a plurality of grooves 22 communicated with nozzle apertures 28; an ink chamber 26 for supplying ink to the individual grooves 22; and an ink reservoir 31 defining a communication portion of a flow path with the ink chamber 26, the flow path intercommunicating ink storage means for storing the ink and the ink chamber 26, the ink reservoir 31 includes at least one of a tapered portion 37 opened progressively wider toward the ink chamber 26 and a throttling portion 38 progressively narrowing the flow path toward the ink chamber 26.

Abstract: To provide an ink jet head and an ink jet recording apparatus in which it is possible to reliably prevent ink bubbles from staying in the ink sump and the interior of the head chip and in which it is relatively easy to remove the bubbles. The ink jet head includes: a plurality of grooves arranged side by side so as to communicate with nozzle openings; an ink chamber for supplying ink to each of the grooves; an ink sump provided so as to communicate with the ink chamber; and ink storage unit (50) communicating with the ink sump through ink supply passages, in which there is provided an air duct (100) establishing communication between a region in the ink sump which is substantially free from interference with an ink flow from the ink supply passages (33) to the ink chamber and in which bubbles easily gather and an air region of the ink storage unit (50). Therefore, the bubbles in the ink can be surely removed.

Abstract: A semiconductor device comprises at least two semiconductor elements connected together at a connecting region of the semiconductor elements. At least one joint chip is adhered to the connection region of the semiconductor elements for connecting the semiconductor elements together. The joint chip has a trapezoidal cross-section defining a first surface and a second surface wider than the first surface. The second surface of the joint chip is adhered to the connection region of the semiconductor elements.

Abstract: An avalanche photodiode for detecting x-rays and other radiation comprises a first substrate having a portion removed therefrom, a first insulating film formed on the first substrate, a second substrate comprising a floating zone silicon semiconductor substrate disposed on the first insulating film, an impurity region selectively formed in the second substrate at a surface corresponding to the removed portion, a PN junction formed on the second substrate, a glass substrate mounted to the second substrate, a first electrode formed on the first substrate for applying a voltage to the impurity region, a second electrode formed on the second substrate for applying a voltage to the second substrate, a third electrode formed on the glass substrate and electrically connected to the second electrode, and an integrated circuit package having a lead pin connected to the third electrode. Accordingly, a shallow depletion layer may be provided on a floating zone SOI substrate.

Abstract: A process for fabricating a semiconductor device which permits the placement of plural semiconductor chip devices at a reduced pitch comprises the steps of bonding a plurality of semiconductor chip devices to a substrate, forming a conductive thin film on the substrate to cover at least connecting regions of the semiconductor chip devices, and patterning the conductive thin film using an excimer laser to form interconnections between the respective semiconductor chip devices. The conductive thin film is formed by a method selected from physical vapor deposition and chemical vapor deposition. The step of bonding the semiconductor chip devices to a substrate is preferably performed using an epoxy-based adhesive. Preferably, an insulating film is formed on the plural semiconductor chip devices in regions except for the connection regions. Patterning of the conductive thin film is performed using an excimer laser beam emitted in two pulses at an output energy of 300 mJ/cm.sup.2.