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US 6,578,942 B1Granted
Liquid crystal sensing of thermal ink jet head temperature
AssigneeXerox Corporation
InventorsRichard H. Tuhro, Frederick A. Donahue
Life of this patent
Estimating the term…
Abstract
In the system of this application, a liquid crystal temperature sensor is applied to the exterior of the print head cartridge of a printing system to give an optical indication of the temperature at the print head that is readable by an optical scanner.
Claims3
A thermal ink jet printing system comprising:
- a print head mounted in said printing system for depositing ink on a print medium;
- a tag mounted on said print head and having a temperature indicator mounted thereon, said temperature indicator providing an optical indication of the temperature of said print head;
- an optical scanner mounted in operative association with said temperature indicator to sense said optical temperature indication and generate a signal relative thereto;
- and
- a processor for receiving the signal from the optical scanner and for processing said signal for use in controlling the operation of said print head.
2 more elements
A thermal ink jet printing system, as described in claim
- wherein said temperature indicator comprises a liquid crystal temperature indicator.
A thermal ink jet printing system, as described in claim
- wherein said optical scanner further comprises:
- a light source for directing light on said temperature indicator;
- and
- a light sensitive element for receiving light reflected from said temperature indicator.
1 more element
Dependencies are inferred from the claim text.