Temperature control for an ink jet printhead
First Claim
1. An improved temperature control system for an ink jet printer which includes an ink jet printhead bonded to an underlying heat sink substrate, the control system including a sensing means for sensing the temperature of said printhead, heater means thermally coupled to said printhead, and a heat sink member in thermal communication with said printhead;
- control means responsive to outputs from said temperature sensing means and adapted to provide or remove power from said heater means, the improvement wherein said temperature sensing means and heater means are resistive layers separated from said heat sink substrate and said printhead by dielectric layers.
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Accused Products
Abstract
In a printhead die-bonded to a substrate, a recess, in a preferred embodiment, is formed in the substrate and layers of resistive material separated by a dielectric layer are formed in the recess by a thick film screen print process. The recess underlies the printhead which remains bonded to the substrate along the edges of the recess. This arrangement provides good proximity of the heater and the temperature sensor to the printhead enabling measurements to be made and sent to a control circuit which regulates heater operation to maintain the printhead within a desired operating range. The configuration also allows precise positioning of the printhead with the metal surface as a reference.
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Citations
11 Claims
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1. An improved temperature control system for an ink jet printer which includes an ink jet printhead bonded to an underlying heat sink substrate, the control system including a sensing means for sensing the temperature of said printhead, heater means thermally coupled to said printhead, and a heat sink member in thermal communication with said printhead;
- control means responsive to outputs from said temperature sensing means and adapted to provide or remove power from said heater means, the improvement wherein said temperature sensing means and heater means are resistive layers separated from said heat sink substrate and said printhead by dielectric layers.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
- 9. In an ink jet printer, a printhead comprising a substrate which incorporates ink heating resistors adapted to heat ink supplied thereto by an ink channel and manifold assembly, and further comprising a heat sink substrate bonded to said heating resistive substrate, said heat sink substrate incorporating a heater resistive layer and a temperature sensing resistive layer separated from said ink heating resistor substrate and said heat sink substrate by dielectric layers.
Specification