EP0259541A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for printing gray scales with a thermal ink jet printer
Assignee: HP Inc
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Filing: 1987-04-16
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Granted: —
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Expires: 2007-04-16
Abstract
Abstract A thermal ink jet printer emits drops (7) that merge together (1) on the surface of a substrate (3) within the wetting time of the substrate (3). The size of the dot printed is controlled by the number of drops emitted by the thermal ink jet printer (15) within the wetting time of the substrate (3).
Inventors
- 👤 Howard H. Taub
- 👤 William J. Lloyd
- 👤 Gregory Hirsch
- 👤 John D. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/032; H04N1/034; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2121; B41J2/2128
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A method of printing a dot on a substrate using a thermal ink jet head, characterized by ejecting a plurality of drops (7) from said thermal ink jet head (15) within the wetting time of said substrate (3); and collecting said plurality of drops (7) on one location of said substrate (3).
Claim 2
Independent Claim
52 words
A method of printing a dot on a substrate using a thermal ink jet head, characterized by ejecting a plurality of drops (7) from said thermal ink jet head (15) within the wetting time of said substrate (3); and collecting said plurality of drops (7) on one location of said substrate (3).
Claim 3
Dependent Claim
29 words
The method as in claim 1, characterized by controlling the dot size (5) by controlling the number of drops (7) ejected within the wetting time of said substrate (3).
Claim 4
Dependent Claim
72 words
The method as in claim 2, characterized in that the step of ejecting a plurality of drops (7) further comprises: heating a first ink volume (31) in said thermal ink jet head (15) to form a vapor bubble; ejecting a portion of said ink volume (31) from said thermal ink jet head (15); delaying (13) the subsequent heating of a subsequent ink volume (29) until the remainder of said vapor bubble collapses.
Claim 5
Dependent Claim
21 words
The method as in claim 3, characterized in that the subsequent heating is delayed for 0.1 usec to 1.0 msec (13).
References Cited (Backward Citations)
No citation records indexed.
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