EP0288044A2
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EP
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Ink jet recording apparatus with density control function
Assignee: Panasonic Holdings Corp
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Filing: 1988-04-20
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Granted: —
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Expires: 2008-04-20
Abstract
Abstract A multi-nozzle type ink jet recording apparatus arranged so as to eject ink from each of a plurality of ink nozzles (88-91) toward a writing surface by means of an electric field established due to an ink ejecting signal applied to each of ink nozzles. The ink jet recording apparatus includes a circuit (1) for generating a density information signal indicative of a recording density at every ink nozzle and a control unit (3) being responsive to the density information signal and having a plurality of memories (11-13). Each of the plurality of memories stores a density-to-signal characteristic being predetermined to correspond to one or more of the ink nozzles (88-90) and the density-signal characteristic represents the relation between the recording density and the ink ejecting signal indicative of an ink ejecting amount ejected from each of the ink nozzles. The control unit (3) selects one from the density-to-signal characteristics at every ink nozzle and generating the ink ejecting signal indicative of the ink ejecting amount determined on the basis of the density information signal from the density information signal generating (1) circuit in accordance with the selected density-to-signal characteristic, the generated ink ejecting signal being applied to the corresponding ink nozzle.
Inventors
- 👤 Toshiyuki Iwasawa
- 👤 Masayoshi Miura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 01:27
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2121; B41J2/2128
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
An ink jet printer comprising: ink jet printing head means having a plurality of ink nozzles each ejecting ink toward a writing surface; means for storing a plurality of predetermined density-application signal characteristics each representing the relation between a required recording density and an ink ejecting signal to be applied to each of said plurality of ink nozzles; and control means for selecting one from said plurality of predetermined density-application signal characteristics in correspondance with each of said plurality of ink nozzles and generating said ink ejecting signal in accordance with the selected density-application signal characteristic.
Claim 2
Dependent Claim
96 words
An ink jet printer comprising: ink jet printing head means having a plurality of ink nozzles each ejecting ink toward a writing surface; means for storing a plurality of predetermined density-application signal characteristics each representing the relation between a required recording density and an ink ejecting signal to be applied to each of said plurality of ink nozzles; and control means for selecting one from said plurality of predetermined density-application signal characteristics in correspondance with each of said plurality of ink nozzles and generating said ink ejecting signal in accordance with the selected density-application signal characteristic.
Claim 3
Dependent Claim
30 words
An ink jet printer as claimed in claim 1, wherein said ink ejecting signal is a pulse signal whose width is determined on the basis of the required recording density.
Claim 4
Dependent Claim
32 words
An ink jet printer as claimed in claim 1, wherein said ink jet printing head means is a signal head and said plurality of ink nozzles are integrally arranged in a row.
Claim 5
Dependent Claim
33 words
An ink jet printer as claimed in claim 1, wherein said ink jet printing head means comprises a plurality of ink jet printing heads each having one of said plurality of ink nozzles.
Claim 6
Dependent Claim
204 words
An ink jet recording apparatus with a multi-nozzle type ink jet printing head having a plurality of ink nozzles and electrode means so as to eject ink from each of said plurality of ink nozzles toward a writing surface by means of an electric field established due to an ink ejecting signal applied to said electrode means, said ink jet recording apparatus comprising: density determining means for determining a recording density at every ink nozzle of said multi-nozzle type ink jet printing head and generating a density information signal; and control means responsive to said density determining means and having memory means storing a plurality of density-to-signal characteristics each being predetermined to correspond to one or more of said ink nozzles and each representing the relation between the recording density and the ink ejecting signal indicative of an ink ejecting amount ejected from each of said plurality of ink nozzles, for selecting one from said density-to-signal characteristics at every ink nozzle and generating said ink ejecting signal indicative of the ink ejecting amount determined on the basis of said density information signal from said density determining means in accordance with the selected density-to-signal characteristic, said ink ejecting signal being applied to the electrode means.
Claim 7
Dependent Claim
204 words
An ink jet recording apparatus with a multi-nozzle type ink jet printing head having a plurality of ink nozzles and electrode means so as to eject ink from each of said plurality of ink nozzles toward a writing surface by means of an electric field established due to an ink ejecting signal applied to said electrode means, said ink jet recording apparatus comprising: density determining means for determining a recording density at every ink nozzle of said multi-nozzle type ink jet printing head and generating a density information signal; and control means responsive to said density determining means and having memory means storing a plurality of density-to-signal characteristics each being predetermined to correspond to one or more of said ink nozzles and each representing the relation between the recording density and the ink ejecting signal indicative of an ink ejecting amount ejected from each of said plurality of ink nozzles, for selecting one from said density-to-signal characteristics at every ink nozzle and generating said ink ejecting signal indicative of the ink ejecting amount determined on the basis of said density information signal from said density determining means in accordance with the selected density-to-signal characteristic, said ink ejecting signal being applied to the electrode means.
Claim 8
Dependent Claim
38 words
An ink jet recording apparatus as claimed in claim 5, wherein said ink ejecting signal is a pulse signal whose width is veried on the basis of said density information signal in accordance with the selected density-signal characteristic.
Claim 9
Dependent Claim
73 words
An ink jet recording apparatus as claimed in claim 6, wherein said electrode means of said multi-nozzle type ink jet printing head comprising a common electrode and a plurality of control electrodes each being probided in correspondance with each of said plurality of ink nozzles and positioned in opposed relation to said common electrode, said pulse signal with a width corresponding to said density information signal being applied to the corresponding control electrode.
References Cited (Backward Citations)
US4555717A
Cited
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