EP0150119A2
Expired / Lapsed
EP
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Ink-jet recording system capable of recording half-tones
Assignee: NEC Corp
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Filing: 1985-01-21
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Granted: —
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Expires: 2005-01-21
Abstract
Abstract In order to obtain an adequate range of image density for half-tone printing an ink-jet print head assembly (14) comprises two ink-jet heads (142a, 142b). These are driven by separate pulse generators (141a, 141b). A comparator (12) responds to a density signal from an image signal force (11) and controls a signal distributor (13) for selective energisation of the two heads. Below a threshold image density the head (142a) is employed; this has a weaker ink and/or small nozzle. Above the threshold, the head (142b) is employed and this has a denser ink and/or a larger nozzle.
Inventors
- 👤 Mitsuo C/O Nec Corporation Tsuzuki
- 👤 Hidehiko C/O Nec Corporation Katoh
- 👤 Michihisa C/O Nec Corporation Suga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 19:58
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2121; B41J2/2128; H; H04; H04N; H04N1/00; H04N1/024; H04N1/032; H04N1/034; H04N1/40; H04N1/40087
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
1 . An ink-jet recording system for recording points in an image as dots on a recording medium, the system comprising an ink-jet print head assembly (14) responsive to driving pulses for ejecting ink droplets to record the dots on the recording medium, characterised in that the head assembly (14) comprises a plurality of ink-jet heads (142a, b) having different recording characteristics to each other, and by a plurality of means (141a, b) for generating the driving pulses and supplying the driving pulses to the ink-jet heads, respectively and means (12) for comparing a density signal with a predetermined level to control the supply of the driving pulses to the ink-jet heads.
Claim 2
Dependent Claim
112 words
1 . An ink-jet recording system for recording points in an image as dots on a recording medium, the system comprising an ink-jet print head assembly (14) responsive to driving pulses for ejecting ink droplets to record the dots on the recording medium, characterised in that the head assembly (14) comprises a plurality of ink-jet heads (142a, b) having different recording characteristics to each other, and by a plurality of means (141a, b) for generating the driving pulses and supplying the driving pulses to the ink-jet heads, respectively and means (12) for comparing a density signal with a predetermined level to control the supply of the driving pulses to the ink-jet heads.
Claim 3
Dependent Claim
33 words
An ink-jet recording system as claimed in claim 1, characterised in that the ink-jet heads (142a, b) are identical in construction to each other and are filled with inks differing in ink density.
Claim 4
Dependent Claim
35 words
An ink-jet recording system as claimed in claim 1, characterised in that the ink-jet heads (142a, b) have nozzles different in size from each other and are filled with inks having the same ink density.
References Cited (Backward Citations)
No citation records indexed.
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