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Determining minimum energy pulse characteristics in an ink jet print head

A pulse and energy technology, applied in printing devices, printing, inking devices, etc., can solve problems such as chip overheating

Inactive Publication Date: 2003-11-05
LEXMARK INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes undesired chip overheating

Method used

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  • Determining minimum energy pulse characteristics in an ink jet print head
  • Determining minimum energy pulse characteristics in an ink jet print head
  • Determining minimum energy pulse characteristics in an ink jet print head

Examples

Experimental program
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Embodiment Construction

[0018] Fig. 1 shows a functional block diagram of a preferred embodiment of an ink jet printer according to the present invention. Preferably, the printer includes a replaceable printhead 10 mounted on a carriage 12 which allows the printhead to translate across the print medium. When installed in a printer, the printhead 10 is electrically connected to a printer controller 14 and a power supply 16 . Since the controller 14 and power supply 16 are preferably located in a fixed location in the printer rather than mounted on the carriage 12, the electrical connection between the printhead 10 and the controller 14 and power supply 16 is through a soft TAB circuit 18. .

[0019] As shown in FIG. 1, the controller 14 receives image data from a host computer, and generates control signals to control the operation of the printhead 10 based on the image data. Controller 14 also controls power supply 16 to generate a supply voltage Vs on line 20 .

[0020] As discussed in more detai...

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PUM

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Abstract

A system for providing an optimal pulse of energy to a resistive heating element (34) in an inkjet printhead (10). The optimum energy pulse provides an optimum energy density at the surface of the heating element (34) to achieve optimum buildup of ink located adjacent to the surface of the heating element (34). The system includes storing in a memory (26) values ​​related to heating element dimensions, heating element electrical characteristics and ink characteristics. Also stored in memory are expressions for providing arithmetic relationships between heating element dimensional values, heating element electrical values, ink properties and the magnitude and duration of the optimum energy pulse. The system also includes retrieving stored values ​​and expressions from memory and determining an optimum energy pulse magnitude and duration based on the expressions. The system also generates and provides optimal energy pulses to the heating element (34) based on the determined amplitude and duration. The energy density provided by the optimal energy pulse is high enough to form a bubble and a small drop of ink near the heating element, but not high enough to be wasted after the bubble is formed and cannot be delivered to the ink.

Description

technical field [0001] The present invention is generally directed to inkjet printing devices. More specifically, the present invention is directed to a method for determining optimum characteristics of energy pulses provided to resistive heating elements in an inkjet printhead, and for determining optimum characteristics of resistive heating elements. Background technique [0002] A thermal inkjet printer forms an image on a print medium by expelling small ink droplets from an array of nozzles in an inkjet printhead as the printhead sweeps across the print medium. When a current pulse is passed through a resistive heating element, the heat generated causes ink in contact with the heating element to coalesce to form ink drops. Typically each nozzle of the array has a corresponding resistive heating element. The energization of any particular resistive heating element is typically controlled by a microprocessor controller within the printer. [0003] Once ink bubbles begin...

Claims

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Application Information

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IPC IPC(8): B41J2/05B41J2/14
CPCB41J2/04553B41J2/04563B41J2/0458B41J2/0459B41J2/04591B41J2/04593B41J2/14129B41J2202/17B41J2/04541B41J2/14427B41J29/393
Inventor 罗伯特·W·科奈尔
Owner LEXMARK INT INC
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