摘要:
A fluid ejection assembly includes a fluid slot formed in a die. The assembly also includes a nozzle column is formed along a side of the fluid slot. The assembly also includes a pair of thermal sensors to measure die temperature at the middle of the nozzle column and at a first end of the nozzle column.
摘要:
A thermal inkjet printhead and a method of cooling convectively cool the printhead with ink passing through a feed transition chamber. The thermal inkjet printhead includes a bridge beam and feed channels adjacent to the bridge beam. The printhead further includes a feed transition chamber between inputs to the feed channels and an ink reservoir. The ink flows through the feed transition chamber between the ink reservoir and the feed channels to convectively cool. The method of cooling includes providing the feed transition chamber and flowing ink through the feed transition chamber from the ink reservoir to the feed channels. The flowing ink establishes a temperature gradient between walls of the feed transition chamber and the ink. The temperature gradient facilitates convective cooling of the printhead.
摘要:
A liquid-ejecting head includes a liquid cell that contains an ejection medium that is liquid at normal temperature, a nozzle for ejecting the ejection medium in the liquid cell, an energy-generating element for supplying ejection energy to the ejection medium in the liquid cell, and heating means for heating the liquid cell independently of the supply of the ejection energy to the ejection medium in the liquid cell. The energy-generating element is driven to eject the ejection medium from the nozzle in a droplet form. The heating means is supplied with a substantially direct current component to generate heat so that at least the temperature of the liquid cell is constantly maintained above the ambient temperature irrespective of whether the energy-generating element is driven.
摘要:
The invention described in the specification relates to an apparatus and method for cooling a print head containing multiple semiconductor substrates. The substrates which contain a plurality of energy imparting devices (156) for energizing ink are attached to a metal substrate carrier for providing efficient heat transfer from the substrates. A temperature sensing device (140) is attached to the carrier for measuring a temperature of the substrate carrier during a printing operation and for generating an input signal to a controller (150). The controller, in turn, sends an output signal to the print head to selectively energize one or more of the energy imparting devices (156) on each substrate in response to the input signal and a thermal expansion value based on the temperature of the heat transfer member.