Liquid Discharging Recording Head Thermal Conductivity Management
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Solution Overview
Problem
The existing liquid discharging recording heads suffer from in-plane temperature unevenness in recording element substrates, leading to uneven liquid discharge and poor image quality, particularly during high-speed recording, due to differences in heat transfer between the center and peripheral portions.
Innovation Solution
The liquid discharging recording head incorporates a support member with high thermal conductivity and additional members with lower thermal conductivity to manage heat transfer, specifically using silicon carbide for the support plate and resin materials with varying thermal conductivities for the first and second members to support the recording element substrates, thereby reducing temperature differences across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the length and number of discharge port arrays are increased to increase recording speed, then productivity is improved, but the in-plane temperature distribution becomes more uneven, worsening manufacturing precision
Solution Approach 1:
The patent applies local quality by providing different thermal conductivities at different locations of the support plate. Specifically, the support plate has a first thermal conductivity in a first region and a second thermal conductivity in a second region, where the ratio of thermal conductivities is designed to compensate for heat loss differences between center and outer peripheral portions of recording element substrates. This localized differentiation of thermal properties enables uniform temperature distribution across the entire substrate despite increased substrate length and number of discharge port arrays.
2Productivity
If input heat energy per unit time is increased for high-speed image recording, then productivity is improved, but the unevenness in temperature in the plane of the recording element substrate increases further, worsening manufacturing precision
Solution Approach 1:
The patent applies parameter changes by modifying the thermal conductivity parameter of the support plate in different regions. The support plate is designed with a first thermal conductivity in the first region and a second thermal conductivity in the second region, creating a non-uniform thermal conductivity distribution. This parameter variation allows the system to maintain uniform temperature distribution even when input heat energy per unit time is increased for high-speed recording, as the altered thermal conductivity parameters compensate for the increased heat generation and distribution challenges.
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
This configuration enhances the in-plane temperature uniformity of the recording element substrates, resulting in improved image quality with reduced density unevenness and increased recording efficiency.
Implementation Method 1
a support member configured to support the element substrate; a first member configured to support an end of the element substrate in an array direction in which the discharge ports are arrayed, the first member having a thermal conductivity less than a thermal conductivity of the support member
Implementation Method 2
a first member configured to support an end of the element substrate in an array direction in which the discharge ports are arrayed, the first member having a thermal conductivity less than a thermal conductivity of the support member; and a second member configured to support an end of the element substrate in an intersecting direction, which intersects the array direction, the second member having a thermal conductivity less than the thermal conductivity of the support member and a thermal resistance less than a thermal resistance of the first member
Implementation Method 3
When a pulse signal is transmitted from a liquid discharging recording apparatus body to heaters (recording elements) on the recording element substrates H1100, heat energy is applied to discharge the liquid from the discharge ports
Data Source
AI summary
A liquid discharging recording head includes an element substrate including a plurality of discharge ports configured to discharge liquid and a plurality of energy generating elements configured to generate energy for discharging the liquid, a support member configured to support the element substrate, a first member configured to support an end of the element substrate in an array direction in which the discharge ports are arrayed, the first member having a thermal conductivity lower than a thermal conductivity of the support member, and a second member configured to support an end of the element substrate in an intersecting direction intersecting the array direction, the second member having a thermal conductivity lower than the thermal conductivity of the support member and a thermal resistance lower than a thermal resistance of the first member.