Abstract: The present invention provides an ink jet head substrate comprising a heat generating resistance member forming a heat generating portion, an electrode wiring electrically connected to the heat generating resistance member, and an anti-cavitation film provided on the heat generating resistance member and the electrode wiring via an insulation protection layer, and wherein the anti-cavitation film is formed from different materials with more than two layers.

Abstract: A boundary nozzle which is contained in a block that has not been driven and is situated at the boundary with a driving block that is driven prior to the block containing the boundary nozzle contains a second stopper which has a length in a liquid flow direction longer than that of a first stopper contained in a driving nozzle in the driving block that is driven prior. A near-boundary nozzle adjacent to the boundary nozzle has a third stopper which has a length in a liquid flow direction longer than that of the first stopper but shorter than the second stopper. Thus, recording irregularities owing to meniscus regression are suppressed.

Abstract: A liquid discharge head comprises a heating element which heats liquid in a liquid flow path to produce a bubble in the liquid, a discharge port through which liquid is discharged by pressure involved in bubble growth, the discharge port communicating with the lower part of the liquid flow path and being smaller in the area of a cross section at right angles to the direction of liquid introduction than the liquid flow path, a movable member which is provided like a cantilever in the liquid flow path, the free end of the member being positioned on the side of the discharge port, and a restrictor which substantially closes the upper part of the liquid flow path by being substantially brought into contact with the movable member when the movable member is displaced by the growth of the bubble, wherein a meniscus is in the discharge port when due to bubble breakage, the movable member moves from the normal position in such a direction that the liquid flow path is open widely and then returns to the normal positio

Abstract: In a liquid discharge head having a movable member positioned oppositely to a heating element with a distance from the heating element to realize the liquid discharge head, in which durability of a movable member is improved and discharge characteristic is stable, and reliability is high. On a device substrate on which a plurality of heating elements are mounted in parallel, a deposition film is formed by photolithographic technique to form a movable member, by soaking the movable member in an etching solution after formation of the movable member, a right-angled part and an acute-angled part, and a burr formed on the edge of a side part of the movable member are removed to make a surface of the side part of the movable member to the curved face 11.

Abstract: An ink jet recording head includes an ejection outlet for ejecting ink; an ink passage provided corresponding to the ejection outlet; a thermal energy generator to heat the ink in the passage to create a bubble; a flow resistance element, disposed in the ink passage upstream of the thermal energy generator with respect to a direction of flow of the ink, having a reduced ink passage area to divide the bubble.

Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Abstract: An ink jet recording head is provided having an ejection orifice for ejecting ink, an ink passage corresponding to that ejection orifice, and a thermal energy generator for heating ink in the passage to create a bubble. A flow resistance element is provided in the ink passage upstream of the thermal energy generator with respect to the direction of ink flow, and this element has a reduced ink passage area which serves to divide the bubble, improving ink jet operation. Further, the ink jet head can be driven by dividing plural thermal energy generations into groups and driving those groups so that a given group is driven before the bubble formed by a previously-driven group reaches its maximum size.

Abstract: In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.

Abstract: In a print head of this invention, electricity-to-heat converters and a driver circuit for driving these electricity-to-heat converters in accordance with print data are formed on a single board. The board further includes an input/output interface circuit for receiving print data from an external apparatus, a CPU for controlling a printer apparatus, a ROM, a RAM, an A/D converter, a D/A converter, a timer, and the like, and also includes an external element driver for driving a mechanism portion of the printer apparatus.

Abstract: An ink jet recording head of high printing quality including a plurality of electro-thermal transducers arranged on a substrate corresponding to respective nozzles, wherein each protective layer placed on a resistor constituting each of the plurality of electro-thermal transducers has a thickness-reduced portion at a part thereof so as to increase the distance between the center point of the air bubble of each of the plurality of electro-thermal transducers to longer than the distance between the centers of gravity of each of the plurality of electro-thermal transducers. With the ink jet recording head, the relationship between the amount and the speed of ejected ink droplets can be optimized in accordance with the size of areas of the electro-thermal transducers.

Abstract: An operation control section forms a command signal Cn so that the number of times ink droplets are ejected per one pixel ejected from each ejection opening of a printing head in accordance with flying characteristics of the ink droplet becomes two times for each pixel in a forward path and once for each pixel in a reverse path. The command signal Cn is fed to a drive pulse signal forming section.

Abstract: An ink jet head having a buffer chamber which absorbs any back-pressure wave generated as a result of generation of back wave, thereby preventing reduction of refilling with ink. Exothermic elements provided in buffer chambers formed in a common ink chamber generate bubbles so that bubbles are always maintained in the buffer chambers so as to ensure stable recording.

Abstract: An ink jet recording apparatus includes an ink jet recording head which has an ink ejection outlet, an ink passage, a heater for heating ink to form a bubble in the ink so as to allow a part of the ink to be ejected from the ink ejection outlet in the form of an ink droplet, and a driving circuit for applying a driving signal group to the heater. The driving signal circuit serves to apply a driving signal group including one or more pulses per a single pixel to the heater corresponding to the value representing an input image signal. In response to this input image signal, an ink droplet group having independent ink droplets is ejected from the ejection outlet toward a recording sheet. Since a quantity of ink ejected per a single pixel is variably controlled by changing the number of ink droplet ejection, each recording operation can be achieved while maintaining excellent gray scale properties.

Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Abstract: A downsized, low-cost, high-density printhead, a printing apparatus and a printing method using the printhead can be achieved. If the number of electrothermal transducers is N, a shift register is capable of storing print information corresponding to N/8 electrothermal transducers. First, print information corresponding to the capacity of the shift register is transferred to the printhead. Then, the shifting function of the shift register is stopped to hold the print information. A 3-bit selection signal is inputted from an input terminal as the print information information. The selection signal is sent to a time-divisional logical circuit, then N/8 electrothermal transducers are selected, and a printing operation based on the input data is performed. This operation is repeated eight times, to complete printing by all the N electrothermal transducers.

Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Abstract: A recording head comprises a liquid emission member having an orifice through which an ink is emitted, an electro-thermal converter element for generating a thermal energy which is utilized to emit the ink introduced into the liquid emission member, and a functional element disposed on a same substrate on which the electro-thermal converter element is disposed for driving and controlling the electro-thermal converter element.The functional element includes an NPN bipolar transistor for driving the electrothermal converter element and a CMOS transistor composed of an NMOS transistor and a PMOS transisfor for controlling an operation of the bipolar transistor.The NMOS transistor being formed in a P well diffusion layer in an N.sup.- type epitaxial growth layer which is grown on a surface of a P type semiconductor substrate.The PMOS transistor being formed in an N well diffusion layer in the N.sup.- type epitaxial growth layer which is grown on the surface of the P type semiconductor substrate.

Abstract: An ink jet recording apparatus comprises a plurality of ink discharge portions having discharge ports for discharging ink, ink channels communicating to the discharge ports, and electricity-heat converters for applying the heat energy to the ink within the ink channels, which electricity-heat converters are divided into plural groups supplied with separate signals for generating heat energy, and a conveying mechanism for conveying a recording medium to be recorded with the ink discharged from the discharge ports. The shapes of the ink discharge ports or other geometrical properties of the apparatus are changed for different groups of electricity heat converters to compensate for variations in the velocity of the ink discharged from the different groups.