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AssigneeCanon Kabushiki Kaisha
InventorYasuyuki Tamura
Estimating the term…
An ink jet recording head has an energy generating device line constituted by electrically connecting N (N>1) energy generating devices in series. The energy generating devices are disposed to correspond to a plurality of discharge ports for discharging ink and generate discharging energy. The energy generating device line is operated by using substantially N+1 electrodes. The method of operating an ink jet recording head comprises the steps of: successively selecting the energy generating devices of the energy generating device line; applying voltages of different levels to the two terminals of the selected energy generating device having received an image signal instructing the selected energy generating device to discharge the ink; and applying voltages of the same level to the two ends of the energy generating device which corresponds to the discharge ports which are not to discharge the ink.
A method of operating an ink jet head having a group of N (N>1) means for generating energy electrically connected in series, said group of energy generating means electrically connected to wiring electrodes, the group of energy generating means being operated through N+1 said wiring electrodes, and by such operation ink being discharged from discharge ports provided to correspond to said energy generating means, said method comprising the steps of:
An ink jet apparatus comprising:
A method of operating an ink jet head having a group of N (N>1) means for generating energy electrically connected in series, each energy generating means electrically connected to wiring electrodes, the group of energy generating means being operated through N+1 said wiring electrodes, and by such operation ink being discharged from said discharge ports provided to correspond to said energy generating means, said method comprising the steps of:
An ink jet apparatus comprising:
A method of operating an ink jet head having a plurality of means for generating energy, said plurality of energy generating means electrically connected to wiring electrodes, said method comprising the steps of:
An ink jet apparatus comprising:
An ink jet apparatus using an ink jet head including a plurality of discharge ports, a group of N (N>1) means for generating energy electrically connected in series, said group of energy generating means electrically connected to wiring electrodes, and N+1 said wiring electrodes for operating said group of energy generating means, and by such operation ink being discharged from said discharge ports provided to correspond to said energy generating means, said apparatus comprising:
An ink jet apparatus using an ink jet head including a plurality of discharge ports, a group of N (N>1) means for generating energy electrically connected in series, said group of energy generating means electrically connected to wiring electrodes, and N+1 said wiring electrodes for operating said group of energy generating means, and by such operation ink being discharged from said discharge ports provided to correspond to said energy generating means, said apparatus comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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Control methods or devices therefor, e.g. driver circuits, control circuits: specific driving circuit
Control methods or devices therefor, e.g. driver circuits, control circuits: block driving
Control methods or devices therefor, e.g. driver circuits, control circuits: power supply level being detected or varied
Control methods or devices therefor, e.g. driver circuits, control circuits: controlling heads based on heating elements forming bubbles
Term ended 19 Dec 2012 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a method of operating an ink jet recording head. More particularly, the present invention relates to a method of operating an ink jet recording head arranged in such a manner that energy generating bodies for discharging ink are connected to one another in series.
2. Related Background Art
FIG. 1 is a circuit diagram for operating an ink jet recording head according to a first embodiment of the present invention;
FIG. 2 is a timing chart which illustrates the operation of an operating circuit shown in FIG. 1;
FIG. 3 is a circuit diagram which illustrates an example of a level converting circuit;
A preferred recording head for use in a discharge operating method for an ink jet recording head is arranged in such a manner that N energy-generating means are provided for the ink jet recording head, the N energy-generating means are connected to form groups or lines. Furthermore, N+1 wiring electrodes are connected to the energy generating means groups or lines. The above-described structure is operated in such a manner that the energy generating means are selected at predetermined intervals via the above-described wiring electrodes. When an image signal is supplied to a nozzle which corresponds to the selected energy generating means, voltages of different levels are applied to the wiring electrodes at the two end portions of the electrothermal converting bodies to produce an operating current for energization. As described above, since the image signal does not relate to the operation for selecting the electrothermal converting body to be operated, the width of the image signal, that is, the period in which the electrothermal converting body is operated can be optionally determined during the period in which a desired electrothermal converting body is being selected.
According to the present invention, the electric currents for operating the energy generating means can always be generated in the same direction when the energy generating means is operated. Therefore, each of the wiring electrodes except for the two terminal wiring electrodes of the energy generating means line can be supplied with the electric current flowing in opposite directions when the two energy generating means connected to the above-described wiring electrodes are operated.
Furthermore, since one energy generating means is selected at a time from each of a plurality of energy generating means groups, a plurality of energy generating means are operated simultaneously. As a result, recording can be performed at high speed. In this case, a problem may arise in that dot lines recorded on the recording medium are deflected due to the operating condition and the difference in the operating timing for each of the energy generating means lines. However, this can be prevented by diagonally forming the nozzle lines of the ink jet recording head at a predetermined angle.