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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Takahashi; Yoshikazu
Address:
Nagoya, JP
No. of patents:
53
Patents:


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Patent Number Title Of Patent Date Issued
8235614 Image processing devices and sheet feeding devices August 7, 2012
An image forming apparatus including an image forming portion that forms an image on a surface of a sheet, a feeding device that feeds the sheet in a sheet feeding direction, a sheet receiving portion, and an engagement portion selectively moves between a first position and a second
8186795 Liquid droplet jetting apparatus and program for controlling jetting a liquid droplet May 29, 2012
A data generating circuit incorporated in an ASIC includes a first jetting mode memory circuit which stores information related to a plurality of first jetting modes, a time-sequence information memory circuit which stores time-sequence information of a jetting mode which associates
8096633 Liquid droplet ejecting apparatus January 17, 2012
An object of the invention is to provide a liquid droplet ejecting apparatus capable of determining a type of droplet to be ejected through each nozzle at an arbitrary ejection timing, with consideration of not only an influence of droplet ejections at preceding and following ejectio
8083310 Liquid droplet ejecting apparatus December 27, 2011
A liquid droplet ejecting apparatus includes an ejecting head configured to eject liquid droplets onto an ejected target element to form a of dots arranged at predetermined dot intervals in dot columns. The liquid droplet ejecting head has a flow passage unit including individual flow
8007079 Liquid droplet jetting head and method of manufacturing liquid droplet jetting head August 30, 2011
A piezoelectric actuator, a cavity plate, a base plate, and a supply plate are common in normal specifications, black high-speed focused specifications, and color-image focused specifications, but other plates such as a manifold plate, a damper plate, a spacer plate, and a nozzle pla
7780274 Droplet ejection device August 24, 2010
A droplet ejection device including: a cavity unit having nozzles and pressure chambers; an actuator unit including actuators corresponding to the respective pressure chambers, such that each actuator is operable to change a volume of the corresponding pressure chamber whereby a droplet
7740344 Liquid droplet jetting apparatus and ink-jet printer June 22, 2010
An ink-jet head includes a plurality of pressure chambers arranged in a paper feeding direction, and two manifold channels extended along the paper feeding direction. The manifold channel includes a first area which communicates with the pressure chambers, and a second area which is
7703896 Liquid-droplet jetting apparatus and liquid transporting apparatus April 27, 2010
An ink-jet head includes a channel unit having pressure chambers; and a piezoelectric actuator which includes a vibration plate having an electroconductive substrate and an insulating layer, a piezoelectric layer arranged in an area overlapping with the pressure chamber, and a common
7699444 Liquid droplet-jetting apparatus and method for producing liquid droplet-jetting apparatus April 20, 2010
A channel unit has a first individual ink channel including a first nozzle and a first pressure chamber, and a second individual ink channel including a second nozzle and a second pressure chamber. The channels have a mutually identical channel structure. A piezoelectric actuator, in
7637591 Inkjet head, inkjet recording apparatus and method of forming dot pattern December 29, 2009
An ink-jet head has a plurality of nozzles formed on an ink-jetting surface, a plurality of manifolds, and a plurality of individual ink channel groups each of which includes a plurality of individual ink channels communicating with nozzles and one of the manifolds. Symmetric-centers
7625074 Liquid droplet-jetting apparatus and ink-jet printer December 1, 2009
An ink-jet head includes pressure chambers arranged in a row in a row-direction, and a manifold flow passage communicated with the pressure chambers and extending in the row-direction. An ink inflow port is formed at one end of the manifold flow passage. The manifold flow passage has a
7597422 Ink-jet printer, head for ink-jet printer and flexible cable usable for the same October 6, 2009
The ink-jet printer head includes a cavity unit which has a plurality of pressure chambers arranged in a plurality of pressure-chamber rows; an actuator unit which has individual surface electrodes corresponding to the pressure chambers respectively, and land portions conducted to the
7543918 Liquid jetting head and method for producing the same June 9, 2009
An ink-jet head includes a channel unit in which a plurality of pressure chambers are formed; and a piezoelectric actuator which includes a vibration plate, a piezoelectric layer formed on an upper surface of the vibration plate, and an electroconductive layer formed on an upper surf
7438403 Inkjet printhead with compensating member October 21, 2008
An inkjet printhead includes: a cavity unit having aligned nozzles, pressure chambers correspondingly aligned, and a common-chamber member having a common chamber connected, at an introduction place, to an ink source to receive and distribute ink to the pressure chambers, and extendi
7410232 Ink-droplet ejecting apparatus August 12, 2008
An ink-droplet ejecting apparatus includes a nozzle; an ink pressure chamber; an actuator which produces a pressure wave in the ink; and a control device which, when a first print command corresponding to a first print period for ejecting the ink and a second print command correspond
7334879 Ink-jet head February 26, 2008
An ink-jet head comprises an ink chamber, a pressure chamber, an actuator, a constriction, and a nozzle. The ink chamber contains ink. To the pressure chamber, ink is supplied from the ink chamber. The actuator is applied with a drive pulse to thereby change the pressure of ink in the
7264339 Droplet ejecting apparatus September 4, 2007
An ink jet printer head includes a channel unit and an actuator unit that are bonded to each other. The channel unit has pressure chambers located between a manifold and nozzles. The actuator unit includes piezoelectric sheets, and individual electrodes and common electrodes that are
7134746 Piezoelectric transducer for use in ink ejector and method of manufacturing the piezoelectric tr November 14, 2006
Inner individual electrodes are formed at intervals on a piezoelectric ceramic layer so as to correspond in a one-to-one relationship with ink channels, and an inner common electrode are formed on another piezoelectric ceramic layer. The required number of piezoelectric ceramic layer
7121651 Droplet-jetting device with pressure chamber expandable by elongation of pressure-generating sec October 17, 2006
A droplet-jetting device, which is usable for an ink-jet recording apparatus, comprises a pressure chamber disposed between a cavity plate and a pressure-generating section of a piezoelectric actuator. The pressure-generating section and the cavity plate are connected by a connecting
7048362 Apparatus for ejecting droplets and method for manufacturing the same May 23, 2006
An ink-jet head is constructed by a passage unit and an actuator unit being put in layers. The passage unit and the actuator unit are independently formed, and then bonded to each other by being heated with a thermosetting adhesive being interposed therebetween to not less than a cur
6993812 Method of manufacturing the piezoelectric transducer February 7, 2006
Inner individual electrodes are formed at intervals on a piezoelectric ceramic layer so as to correspond in a one-to-one relationship with ink channels, and an inner common electrode are formed on another piezoelectric ceramic layer. The required number of piezoelectric ceramic layer
6926382 Ink-jet head and ink-jet printer August 9, 2005
An ink-jet head comprises pressure chambers arranged along a first flat face, and nozzles each open in a second flat face opposing to the first flat face. The nozzles are connected to the respective pressure chambers. The ink-jet head further comprises a common ink chamber extending alon
6918660 Ink ejecting device July 19, 2005
A first cavity plate formed with a first pressure chamber and a second cavity plate formed with a second pressure chamber are disposed on both sides of a piezoelectric actuator. A pressure generating portion is formed between opposed surfaces of the piezoelectric actuator. The first pres
6863383 Piezoelectric transducer and ink ejector using the piezoelectric transducer March 8, 2005
A piezoelectric transducer is provided with a first set of electrodes spaced in a thickness direction of the piezoelectric ceramic layers, and a second set of electrodes spaced in a direction along a plane of the piezoelectric ceramic layers. The first set of electrodes defines there
6739704 Piezoelectric transducer and ink ejector using piezoelectric transducer May 25, 2004
In a piezoelectric transducer, first piezoelectric ceramic layers are laminated on second piezoelectric ceramic layers, which are placed over an array of ink channels. In the first piezoelectric ceramic layers, two areas defined, corresponding to each ink channel, by a column of positive
6709091 Ink ejection device and driving method therefor March 23, 2004
An ink ejection device capable of canceling pressure wave vibrations remaining in ink after the ink has been ejected, regardless of the temperature of the ink. In response to a one-dot print command, the volume of the corresponding ink channel is increased (AS) then decreased (AE) af
6695439 Piezoelectric transducer and liquid droplet ejection device February 24, 2004
A piezoelectric transducer 10 includes a piezoelectric plate 11, in which a plurality of piezoelectric ceramic layers 11a-11d are stacked one on another. The piezoelectric plate 11 is polarized in directions symmetrically with the center of each ink chamber 24 and slanted with respec
6679588 Piezoelectric transducer and ink ejector using piezoelectric transducer January 20, 2004
A piezoelectric transducer having inner electrodes placed on each laminated piezoelectric ceramic layer. The inner electrodes include a center electrode centered over each ink channel, two end electrodes aligned with partition walls defining each ink channel, and two border electrodes
6655790 Piezoelectric actuator and fluid jet apparatus and method for manufacturing the piezoelectric ac December 2, 2003
First internal electrodes are disposed in a piezoelectric laminate in association with each side of chambers, and second internal electrodes are disposed in association with central portions of the chambers. The first internal electrodes are interconnected by a first lead. The second
6527354 Satellite droplets used to increase resolution March 4, 2003
An ink jet recording apparatus with a high-resolution and high-quality printout produced by satisfying X>(K1+K2) and by setting a value obtained by an equation {(D/V2)-D/V1)}.times.VS to more than (K1+K2)/2 and less than X-(K1+K2)/2, where D (m) is a distance between a nozzle and a
6428136 Ink jet recording method and ink jet recorder August 6, 2002
A recording method using an ink jet recorder with an actuator includes detecting an ink temperature and controlling a drive voltage for driving actuator depending on both of detected temperature and selected record resolution. A rate of change in the drive voltage with respect to the
6419339 Ink jet recording method and ink jet recorder for ejecting controlled ink droplets July 16, 2002
Serial dots are printed with a drive waveform 1 for section of four ink droplets per dot from a nozzle. If one print instruction for a dot immediately follows and immediately precedes no others, a drive waveform 2 for ejection of less than four ink droplets per dot from a nozzle is s
6419336 Ink ejector July 16, 2002
An ink ejector includes an ink jet head. The head has ink channels each defined between a pair of actuator walls. The head also has nozzles each communicating with one of the channels. In accordance with a print instruction, a controller applies to the appropriate actuator walls one or
6416149 Ink jet apparatus, ink jet apparatus driving method, and storage medium for storing ink jet appa July 9, 2002
Three types of ink droplets, that is, large, medium and small droplets are ejected to produce a gray-scale image, and three drive waveforms are prepared for each of the three types of ink droplets. The drive waveform to print a dot is selected by judging whether there is ink ejection
6412927 Ink ejection device for forming high density dot image by successively ejecting two or more ink July 2, 2002
An ink ejection device that is capable of forming a high density dot image on a recording medium by successively ejecting two ink droplets. Drive timings of an actuator are appropriately set so that the two ink droplets do not join together during their flight times toward the recording
6412925 Ink jet apparatus with ejection parameters based on print conditions July 2, 2002
High print quality can be obtained without changing the drive voltage even when a nozzle has continuously been exposed to air. When ink is ejected immediately after the nozzle has been exposed to air in a non-ejection state, the pulse width of an ink ejection pulse is widened or the numb
6412923 Ink ejector that ejects ink in accordance with print instructions July 2, 2002
An ink ejector has ink channels formed therin. The ejector ejects two consecutive ink droplets for each dot. In this case, an ejection pulse is applied to eject the first droplet from the appropriate channel, and then a non-ejection pulse is applied to cancel the pressure wave vibration
6412896 Ink jet apparatus, ink jet apparatus driving method, and storage medium for storing ink jet appa July 2, 2002
When a dot is formed apart from other dots on a print medium, in response to a discontinuous print command, a first drive waveform is used. The first drive waveform includes an ejection pulse and an ink droplet reducing pulse for retrieving a portion of an ink droplet about to leave
6386665 Ink-jet recording apparatus May 14, 2002
An ink jet recording apparatus wherein each dot, having the same size, may be formed regardless of whether print commands are successive. The ink jet recording apparatus includes a first drive waveform and a second drive waveform wherein the second drive waveform is used when there is no
6260959 Ink ejector July 17, 2001
An ink ejector includes an ink jet head. The head has ink channels each defined between a pair of actuator walls. The head also has nozzles each communicating with one of the channels. The ejector can eject ink from each of the channels through the associated nozzle by driving the as
6257686 Ink droplet ejecting method and apparatus July 10, 2001
In an ink droplet ejecting method and apparatus, when a continuous dot printing is performed and also when a continuous dot printing is followed by a one-dot rest and again subsequent printing, it is intended to suppress the meniscus oscillation of ink, prevent the decrease in ink dr
6145949 Ink jet recorder November 14, 2000
A recorder includes a recording head, which has an ink channel and a nozzle communicating with the channel. A driver can drive the head to eject ink from the channel out through the nozzle. A temperature detector detects one or both of ink temperature and ambient temperature. A memory st
6141113 Ink droplet ejection drive method and apparatus using ink-nonemission pulse after ink-emission p October 31, 2000
In an ink droplet ejection drive method and apparatus, after plural ink emission pulses are generated for each one-dot print instruction or after plural ink emission pulses for plural one-dot print instructions, an ink nonemission pulse is generated to reduce residual pressure wave o
6109716 Ink-jet printing apparatus having printed head driven by ink viscosity dependent drive pulse August 29, 2000
In an ink-jet printing apparatus, a first drive pulse is applied to a printing head and then a second drive pulse is applied to the printing head. The second drive pulse has a magnitude equal to that of the first drive pulse and a pulse width equal to approximately 1.6 to 1.8 times the
6099103 Ink droplet ejecting method and apparatus August 8, 2000
In an ink droplet ejecting method and apparatus, a main driving waveform for the ejection of ink droplet is followed by two additional non-jet pulses, for one dot, without changing a driving voltage, whereby not only an ink droplet of a small volume can be obtained, but also the ink drop
6059393 Driving method for an ink ejection device to enlarge print dot diameter May 9, 2000
In order to enlarge print dot diamter and to obtain an excellent print quality, two droplets are ejected successively at different speeds so that the two droplets merge before individually impinging against a sheet of paper. To this end, a first pulse signal A is applied to an actuator t
5980013 Driving method for ink ejection device and capable of ejecting ink droplets regardless of change November 9, 1999
In view of the fact that the ink viscosity is high when atmospheric temperature is low whereas the same is low when the atmospheric temperature is high, two types of driving signals are selectively applied to an actuator depending on the temperature so that ink droplets are ejected a
5917522 Shearing made ink ejecting apparatus with reliable ejection over a range of temperatures June 29, 1999
A material used for the actuator walls in an ink ejecting device, that are the walls of ink flow paths, are those in which the rate of change of the electromechanical coupling coefficient, with changes in temperature, is not greater than 3000 PPm/.degree. C. at temperatures of 20.degree.
5909228 Ink-jet device having phase shifted driving signals and a driving method thereof June 1, 1999
An ink-jet device and a method for driving the ink-jet device, wherein the pulse width WB of a second driving waveform agrees with a one-way propagation time T, 12 .mu.sec, of an ink pressure wave in ink flow passages. Therefore, there is established a relatively high pressure in the
5903286 Method for ejecting ink droplets from a nozzle in a fill-before-fire mode May 11, 1999
A driving method for driving an ink ejection device operated in shear mode. In order that the ink ejection speed does not vary depending on the driving frequency, a first pulse signal and a second pulse signal are sequentially applied to the electrode of an ink channel. The first pulse
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