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Temperature control circuit for an inkjet printhead

A temperature control, print head technology, applied in thermometers, printing devices, thermometer testing/calibration, etc., can solve problems such as space miniaturization

Active Publication Date: 2017-04-26
FUNAI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A tradeoff in this type of sensor design is that space can be minimized if the sensor-to-sensor bias current is allowed to vary when the temperature slopes of all sensors are constrained to be constant

Method used

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  • Temperature control circuit for an inkjet printhead
  • Temperature control circuit for an inkjet printhead
  • Temperature control circuit for an inkjet printhead

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Embodiment Construction

[0025] Headings used herein are for structural purposes only and are not intended to limit the scope of the description or claims. As used throughout this application, the words "may" and "could" are used in a loose sense (ie, meaning having the possibility), rather than the mandatory sense (ie, meaning must). Similarly, the words "include", "comprising" and variations thereof mean "including but not limited to". To facilitate understanding, like reference numerals have been used where appropriate to designate like elements common to the drawings.

[0026] The main object of the present invention is to provide a system temperature control method with minimal impact on silicon area. This method involves using an external reference provided through an I / O pad. For this purpose, floating gate elements can be used to systematically provide a threshold region for the temperature controller reference. The present invention provides a method for storing incremental levels in a sto...

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Abstract

A temperature control circuit for an inkjet printhead including a temperature sensor portion that generates an output current(IM40) made up of the sum of a current proportional to a sensed temperature on the inkjet printhead and an offset current, and an offset current correction portion that generates a correction current(IM16) that is subtracted from the output current(IM40) to at least partially compensate for the offset current, the output current(IDIFF) as compensated by the correction current being output as a temperature control circuit output current.

Description

technical field [0001] The present invention relates generally to temperature control of a printhead system, and more particularly to a method of storing certain values ​​on the system using a memory element located on a printhead integrated circuit (IC). Background technique [0002] An inkjet printer will produce the best quality when the environment in the nozzle area is consistent from one jetting stroke to the next. Consistent temperature at the start of jetting is one of the important environmental factors to control to produce the best print quality. Therefore, a robust temperature control method is a desired element in printhead design. [0003] To keep costs low, temperature sensors for inkjet printheads need to occupy minimal layout space on the inkjet printhead integrated circuit. One type of sensor produces an output current proportional to the temperature on the printhead integrated circuit. A tradeoff in this type of sensor design is that space can be minimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/195G01K15/00
CPCB41J2/1753B41J2/17546B41J29/13B41J29/38
Inventor S·贝格施特德
Owner FUNAI ELECTRIC CO LTD