Liquid Discharge Head Cooling Channel for Uniform Viscosity
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Solution Overview
Problem
The temperature increase near the trunk part of the piezoelectric actuator in a liquid discharge head leads to uneven viscosity of the liquid, affecting the quality of the formed image.
Innovation Solution
Incorporating a communicating channel that overlaps with the trunk part to cool the vicinity, thereby suppressing temperature increases and maintaining uniform liquid viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a trunk part is provided to supply electric charge to multiple individual electrodes, then electric power supply efficiency is improved, but local temperature increase occurs due to heat generation from large current flow
Solution Approach 1:
The patent introduces a cooling channel as an intermediary element between the trunk part and the surrounding environment. This cooling channel carries liquid that absorbs heat from the trunk part, effectively mediating the thermal interaction and preventing excessive temperature rise while maintaining the electrical function of the trunk part
2Device complexity
If the trunk part is positioned to connect multiple branched parts, then device complexity is reduced, but uneven viscosity of liquid occurs due to temperature variations in the channel member
Solution Approach 1:
The patent applies local quality by positioning the cooling channel specifically at the location where the trunk part generates heat. Instead of uniformly cooling the entire channel member, the cooling effect is localized to the critical area near the trunk part, thereby maintaining liquid viscosity uniformity in the regions where temperature control is most needed while preserving the simplified actuator structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents local temperature rises, ensuring consistent liquid viscosity and improving image quality by stabilizing the discharge process.
Implementation Method 1
a vicinity part, in the channel member, which is in the vicinity of the trunk part is cooled by the liquid flowing in the overlapping part of the communicating channel
Data Source
AI summary
A liquid discharge head includes a channel member and an actuator member. A plurality of individual channels each including a nozzle and a pressure chamber communicating with the nozzle, and a communicating channel communicating with the plurality of individual channels are formed in the channel member. The actuator member is arranged on a surface of the channel member and has: a plurality of actuators each overlapping with the pressure chamber of one of the plurality of individual channels in a first direction orthogonal to the surface and having a plurality of individual electrodes, a plurality of branched parts each of which connects individual electrodes, and a trunk part connecting the plurality of branched parts and provided with a contact with respect to an electric power supply part. The communicating channel has an overlapping part overlapping with the trunk part in the first direction.