EP0118640A2
Expired / Lapsed
EP
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Method of adjusting thermal ink jet printers
Assignee: HP Inc
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Filing: 1983-11-09
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Granted: —
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Expires: 2003-11-09
Abstract
Abstract A method for designing a thermal ink jet printer for minimum cavitation damage of the printhead resistors during bubble collapse and, consequently, maximum lifetime, is shown. The method comprises the steps of selecting a solvent, resistor size and operating temperature so that a calculated B-factor is minimized. The selected parameters can be changed to minimize the calculated B-factor and to achieve a maximum lifetime.
Inventors
- 👤 John David Meyer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/045; B41J2/04501; B41J2/04513; B41J2/04528; B41J2/0454; B41J2/0458; B41J2/135; B41J2/14; B41J2/14016; B41J2/14032; B41J2/1404; B41J2002/14387
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A method for designing a thermal ink jet printer for ejecting ink droplets from an ink supply by heating a printhead resistor and creating a bubble in said ink supply, the method being characterized by the steps of: selecting an ink; selecting a maximum radius of the bubble; selecting an operating temperature of the thermal ink jet printer (1); and calculating a B-factor of the thermal ink jet printer to be less than or equal to a preselected value.
Claim 2
Independent Claim
79 words
A method for designing a thermal ink jet printer for ejecting ink droplets from an ink supply by heating a printhead resistor and creating a bubble in said ink supply, the method being characterized by the steps of: selecting an ink; selecting a maximum radius of the bubble; selecting an operating temperature of the thermal ink jet printer (1); and calculating a B-factor of the thermal ink jet printer to be less than or equal to a preselected value.
Claim 3
Dependent Claim
45 words
A method according to claim 1, further characterized by the step of selecting a printhead resistor (5) having a long dimension and a short dimension so that an average of the long dimension and the short dimension is substantially equal to the maximum bubble radius.
Claim 4
Independent Claim
22 words
A method according to either one of claims 1 and 2, characterized in that the preselected value of the B-factor is 50.
Claim 5
Dependent Claim
30 words
A method according to claim 3, further characterized by the step of decreasing the density of the ink so that the B-factor of the thermal ink jet printer is decreased.
Claim 6
Dependent Claim
39 words
A method according to claim 4, characterized in that the step of decreasing the density of the ink comprises adding a material to the ink which has a density less than the density of the density of the ink.
Claim 7
Dependent Claim
15 words
A method according to claim 5, characterized in that the added material comprises particulate matter.
Claim 8
Independent Claim
20 words
A method according to either one of claims 5 and 6 characterized in that the added material comprises a pigment.
Claim 9
Independent Claim
33 words
A method according to either one of claims 6 and 7 further characterized by the step of increasing the operating temperature of the thermal ink jet printer so that the B-factor is decreased.
Claim 10
Independent Claim
47 words
A method according to any one of the preceding claims characterized in that the ink has a density (p), a specific heat (c) and a latent heat of vaporization (L), and the step of selecting the ink comprises selecting the ink for a minimum value of pc/L.
Claim 11
Dependent Claim
25 words
A method according to claim 9, characterized in that the step of selecting the ink further comprises selecting the ink for a minimum boiling temperature.
Claim 12
Dependent Claim
26 words
A method according to claim 10, characterized in that the step of selecting the ink further comprises selecting the ink for a maximum gram molecular weight.
References Cited (Backward Citations)
No citation records indexed.
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