EP0300743A2
Expired / Lapsed
EP
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Improved spot deposition for liquid ink printing
Assignee: Xerox Corp
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Filing: 1988-07-20
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Granted: —
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Expires: 2008-07-20
Abstract
Abstract A method of depositing spots of liquid ink upon selected pixel centers on a substrate having poor ink absorptive properties so as to prevent the flow of liquid ink from one spot to an overlapping adjacent one. The line of information is printed in at least two passes so as to deposit spots of liquid ink on selected pixel centers in a checkerboard pattern wherein only diagonally adjacent pixel areas are deposited in the same pass. On the second pass the complementary checkerboard pattern is deposited. Ink is not deposited on horizontally or vertically adjacent pixel areas during the single pass since the spots on these adjacent areas have overlapping portions.
Inventors
- 👤 Larry W. Lin
- 👤 Stuart L. Claassen
- 👤 Chein-Hwa Tsao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/12; H04N1/126; H04N1/128; B; B41; B41J; B41J11/00; B41J11/009; B41J11/0095; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2132; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K15/102; G06K15/105; H04N1/19; H04N1/191; H04N1/1911; H04N1/1913; B41J19/00; B41J19/14; B41J19/142; G06K2215/00; G06K2215/0082; G06K2215/0094; G06K2215/101; G06K2215/111; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0466; H04N2201/0468
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
A method of ink droplet printing comprising selectively depositing ink droplets on a substrate to form an image of ink spots, the droplets being selectively directed to abutting pixel areas in horizontal and vertical rows with diagonally adjacent ink spots being substantially in perimeter contact, characterised by depositing a first pattern of ink spots on an area of the substrate in horizontally and vertically alternating pixel areas, and then depositing a second, complementary, pattern of ink spots in the remaining pixel areas.
Claim 2
Independent Claim
82 words
A method of ink droplet printing comprising selectively depositing ink droplets on a substrate to form an image of ink spots, the droplets being selectively directed to abutting pixel areas in horizontal and vertical rows with diagonally adjacent ink spots being substantially in perimeter contact, characterised by depositing a first pattern of ink spots on an area of the substrate in horizontally and vertically alternating pixel areas, and then depositing a second, complementary, pattern of ink spots in the remaining pixel areas.
Claim 3
Dependent Claim
23 words
The method of defined in claim 1 wherein portions of spots of said first pattern overlap portions of spots of said second pattern.
Claim 4
Dependent Claim
34 words
The method as defined in claim 1 or claim 2 wherein the step of depositing said second pattern is initiated after the last deposited spots of said first pattern have achieved a tacky condition.
Claim 5
Independent Claim
45 words
The method as defined in any one of claims 1 to 3 comprising the further step of detecting the nature of said substrate, determining whether said substrate is paper or transparency film, and carrying out said steps of depositing if said substrate is transparency film.
Claim 6
Independent Claim
69 words
The method as defined in any one of claims 1 to 4 wherein said step of depositing said first pattern is achieved by moving said liquid ink spot producing means relative to said area of said substrate in a first pass, and said step of depositing said second pattern is achieved by moving liquid ink spot producing means relative to said area of said substrate in a second pass.
Claim 7
Independent Claim
33 words
The method as defined in any one of claims 1 to 5 wherein the diameters of said first and second spots are √2 times the center-to-center distance between adjacent horizontal and vertical pixels.
Claim 8
Independent Claim
50 words
The method as defined in any one of claims 1 to 6 including providing liquid ink spot producing means for depositing spots of different colors,and sequentially energizing said spot producing means for depositing spots of different colors so as to deposit spots of different colors at the same pixel locations.
Claim 9
Dependent Claim
38 words
The method as defined in claim 7 wherein on said second pass the order of color spots deposited on the said complementary pixel locations is the reverse of the order of color spots deposited on said first pass.
Claim 10
Dependent Claim
85 words
Ink droplet printing apparatus comprising means for selectively depositing ink droplets on a substrate to form an image of ink spots, the droplets being selectively directed to abutting pixel areas in horizontal and vertical rows with diagonally adjacent ink spots being substantially in perimeter contact, characterised by means for depositing a first pattern of ink spots on an area of the substrate in horizontally and vertically alternating pixel areas, and for then depositing a second, complementary, pattern of ink spots in the remaining pixel areas.
Claim 11
Dependent Claim
85 words
Ink droplet printing apparatus comprising means for selectively depositing ink droplets on a substrate to form an image of ink spots, the droplets being selectively directed to abutting pixel areas in horizontal and vertical rows with diagonally adjacent ink spots being substantially in perimeter contact, characterised by means for depositing a first pattern of ink spots on an area of the substrate in horizontally and vertically alternating pixel areas, and for then depositing a second, complementary, pattern of ink spots in the remaining pixel areas.
References Cited (Backward Citations)
No citation records indexed.
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