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6378982 |
Printing apparatus and a printing method
In a multipass printing using a print head which has a plurality of staggered columns of print elements, one and the same print line is formed by using nozzles (k 1 - 129 , k 2 - 1 ) of different...
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6375294 |
Gray scale fluid ejection system with offset grid patterns of different size spots
A fluid ejection system and method for variable density pattern forming by producing a plurality of large, mid-sized and small spots. The plurality of large, mid-sized and small spots are produced...
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6375295 |
Reduced EMI printhead apparatus and method
A printhead apparatus and accompanying method that achieve a staggered firing of multiple firing chambers within a firing interval to reduce EMI caused by multiple firing signal current...
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6371587 |
Ink jet recording apparatus
A first supply switch is connected between a piezoelectric vibrator and a drive signal line for supplying a drive signal to the piezoelectric vibrator in order to control a waveform element...
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6367903 |
Alignment of ink dots in an inkjet printer
A misalignment compensation technique for a dot printer is disclosed. This technique first supplies printing instructions to a printhead for energizing printing elements in various groups...
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6364444 |
Apparatus for and method of driving ink-jet recording head for controlling amount of discharged ink drop
An apparatus for driving an ink-jet recording head includes a piezoelectric device, a drive waveform generation circuit, a waveform extraction circuit. The drive waveform generation circuit...
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6364443 |
Thermal printer and recording method thereof
The invention provides a thermal printer and a recording method of the thermal printer that are capable of reducing the recorded density non-uniformity (jitter) and obtaining a good quality...
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6357865 |
Micro-electro-mechanical fluid ejector and method of operating same
A micro-electromechanical fluid ejector that is easily fabricated in a standard polysilicon surface micromachining process is disclosed, which can be batch fabricated at low cost using existing...
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6359701 |
Multi-head printing with differing resolutions
A printer having at least first and second print heads, each with independently controllable print resolution, controllably prints text data with a first resolution and non-text data with a second...
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6357846 |
Ink jet recording apparatus and recording method using the same
In order to prevent a viscosity of ink near each nozzle orifice of a recording head from increasing, a time to eject an ink drop therethrough is analyzed based on print data. Dot pattern data is...
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6354686 |
Ink jet recording apparatus
A drive signal COM 1 or COM 2 generated by a drive signal generator includes: a drive pulse DP 1 or DP 3 whose bias level is adjusted to a middle voltage Vm; a drive pulse DP 2 whose bias...
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6354685 |
Driving device and driving method of on-demand ink jet printer head
In an on-demand ink jet printer head for discharging minute ink drops by means of meniscus position control and acoustic wave control, the length of each discharge pause period with respect to each...
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6350003 |
Ink droplet ejecting method and apparatus
In an ink droplet ejecting method and apparatus, by merely adding one pulse after a driving waveform for a main ejection of ink, without changing the driving voltage, it is possible to obtain an...
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6345875 |
Field programmable print control
Apparatus and methods for field programmable print control of an ink jet printer allow the timing and control parameters of the ink jet printer to be altered. This allows a user to replace the...
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6338537 |
Head drive circuit and inkjet printer having the same
It is an exemplified object of the present invention is to provide an inkjet printer having a head drive circuit that can generate a less distorted drive waveform stably using a smaller-size and...
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6338544 |
Reduction of stitch joint error by alternating print head firing mode
An apparatus and method for forming an image with a print head that fires groups of drops of fluid results in a reduction in stitch joint error. The stitch joint error is reduced by changing the...
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6337707 |
Image forming device with separately energizable forming elements
An image forming device for registration of images built up of pixels (pixel patterns), provided with: one or more image registration units each including a number of image forming elements and...
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6331038 |
Techniques for robust dot placement error measurement and correction
Techniques to compensate for random and systematic errors when measuring dot placement errors. Error accumulation due to scan axis irregularities during printhead calibration is minimized by...
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6328396 |
Combining multiple printmodes into a single carriage sweep
A method of reducing a time required for an inkjet printer to print a page minimizes unused pen nozzles during printmode transitions. An image to be printed is typically partitioned into different...
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6328395 |
Ink jet printer and ink jet printing method
Drive signal generating means generates a drive signal including a plural number of drive pulses during one period. Print data generating means generates print data to input one or a plural number...
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6318827 |
Method of improving print quality by selectively changing print direction
An ink jet printer wherein unidirectional or bidirectional printing is adaptively selected for predetermined print modes as a function of whether bidirectional alignment has been performed.
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6318828 |
System and method for controlling firing operations of an inkjet printhead
The present invention is a printing system and method having a printhead assembly that controls firing operations of an inkjet printhead. In particular, the system and method control the firing and...
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6318829 |
Ink jet recording apparatus and ink ejection control method
Disclosed are an ink jet recording apparatus and method to achieve good balance between the amount of ink supplied and the amount of ink ejected. An ink jet head of the recording apparatus has an...
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6315377 |
Device and method for protecting a recording head and for reducing power consumption in ink jet recording apparatus
A device and method for protecting a recording head in an ink jet recording apparatus. If no print command is detected at an idle state in which a power source of the ink jet recording apparatus is...
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6315388 |
Draft printing
An improved draft mode for use in a swath-type printer, which enables printing in every printing column, with only half the printing elements being activated in each column.
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6313922 |
Efficient use of a printhead and a compressed swath buffer in an inkjet printer
A method and structure are provided which allow a print pass to be initiated even if a swath buffer in a multi-pass printer has not stored enough print data to utilize the full printhead. In one...
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6305775 |
Ink-jet printing method and apparatus therefor
Each nozzle of an ink-jet head has heaters having different heating capacities, and in accordance with the heater driven, a diameter of an ink dot formed by ink which is discharged from the nozzle...
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6302505 |
Printing system that utilizes continuous and non-continuous firing frequencies
A print cartridge having a plurality of ink drop generators for ejecting droplets of ink on a print media, the print cartridge having a plurality of operating frequencies, including lower stable...
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6302504 |
Recording head and recording apparatus using the same
Upon executing printing by latching an input digital image signal temporarily stored in a shift register (502) by a latch circuit (501), and energizing and driving a heater (401) using a power...
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6299271 |
Ink droplet ejection apparatus and ink jet recorder
An ink droplet ejection apparatus includes a print head having ejection nozzles and three storers store serial ejection data therein and transfer them in order. On the basis of the data output from...
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6299270 |
Ink jet printing apparatus and method for controlling drop shape
A method of ink jet printing including positioning an ink jet print head having a number of nozzles adjacent a sheet of printer media, and moving the sheet or the print head along a scan axis. An...
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6290315 |
Method of driving an ink jet recording head
In order to provide an inkjet recording head in which both high-speed printing and high-quality printing can be attained, a drive signal is generated so as to include a first expanding element and...
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6286924 |
Apparatus and method for heating ink jet printhead
An apparatus and method for heating an ink jet printhead by using pass transistors to generate heat and warm the substrate of the printhead. The ink jet printhead has a plurality of ink jet...
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6280012 |
Printhead apparatus having digital delay elements and method therefor
Printhead and printer arrangements that provide digital delay between firing signals for a common firing interval. The delay achieves a controlled, staggered generation of firing signals that...
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6276774 |
Imaging apparatus capable of inhibiting inadvertent ejection of a satellite ink droplet therefrom and method of assembling same
An imaging apparatus capable of inhibiting inadvertent ejection of a satellite ink droplet and method of assembling same. The imaging apparatus comprises a print head transducer including a pair of...
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6276773 |
Drive method and drive of ink-jet recording head
A drive method and a drive of an ink-jet recording head which is capable of improving recording speed widely, and which is capable of materializing high quality recording without extending...
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6273539 |
Apparatus for and method of ejecting ink for inkjet printer
An ink ejecting apparatus has: a plate member in which an ink channel is formed; an ink supplying source for supplying the ink to the ink channel; a plurality of ink chambers formed in the plate...
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6273537 |
Actuator driving circuit
A drive circuit for driving a piezoelectric element print head actuator that has characteristic wherein its capacitance increases in association with increase in applied drive voltage. The drive...
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6270188 |
Ink jet printer and control method thereof
A control method of an ink jet printer having an ink jet head which ejects an ink droplet to record a dot on a recording sheet. When plural colors of ink are overlapped to record a dot, each color...
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6270185 |
Very-high-ratio mixed resolution and biphod pens for low-cost fast bidirectional one-pass incremental printing
An incremental printer, such as for example an inker printer, produces very small markings (as for example by firing small ink droplets) preferably in a single-pass print mode for text, as well as...
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6270179 |
Inkjet printing device and method
In an inkjet printing device, at least two kinds of drive waveforms are selectively fed to each of plezoelectric elements for controlling an injection amount of ink to be jetted toward a print...
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6264299 |
Method of erasing dots in inkjet printers
In case of an erasure of dots that reduce the ink density by thinning on dots of a bit map data, disappearance of thin lines, and a loss of low density picture and a gradation reversal are...
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6264300 |
Methods of printing with an ink jet printer using inks with same hue and different saturation
A method of printing with an ink jet printer uses inks of the same hue but of different saturation. The method utilizes a single dither array to control the printing application of the ink,...
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6257143 |
Adjustment method of dot printing positions and a printing apparatus
A plurality of patterns respectively having different area factor of dot formation area are formed by forward and reverse scanning printing of a print head, and then optical characteristics of the...
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6257686 |
Ink droplet ejecting method and apparatus
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...
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6257687 |
Method for driving ink jet printing head and circuits of the same
A method for driving an ink jet printing head and circuits of the same are provided which are capable of forming fine ink drops in a stable manner and jetting the ink drops from each nozzle with...
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6250732 |
Power droop compensation for an inkjet printhead
A method and apparatus for reducing power droop for an inkjet printing system comprising a computer, an inkjet printer and a print cartridge. The print cartridge contains a printhead wherein the...
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6247787 |
Print mode for improved leading and trailing edges and text print quality
Described is a method for incremental printing with an inkjet swath printer by depositing multiple drops of an ink from a printhead in each column of an image, in each scanning pass of the...
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6241333 |
Ink jet printhead for multi-level printing
In accordance with a feature of the present invention, an ink jet printing assembly includes a plurality of nozzles having a respective ink-ejection opening arranged to form at least one nozzle...
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6238034 |
Ink-jet recording methods and apparatuses
An ink-jet recording apparatus includes recording head having a plurality of recording elements and performs image recording by the steps of detecting a presence of black dots in a prescribed...
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