Thermal Print Head Cavity Substrate for Heat Loss Reduction
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Solution Overview
Problem
Existing thermal print heads face challenges in improving print quality and energy efficiency due to heat loss and uneven heat distribution during the printing process.
Innovation Solution
A thermal print head design featuring a substrate with a cavity portion overlapping heat generating portions, an insulating layer, and a convex portion with inclined surfaces to enhance heat retention and distribution, along with a reflective layer for improved thermal reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional thermal print head design without cavity portions is used, then the structure is simple and easy to manufacture, but heat loss occurs and printing energy efficiency deteriorates
Solution Approach 1:
The substrate is segmented by forming cavity portions that divide the heat generating portions into isolated regions. This segmentation prevents heat from spreading to adjacent areas and reduces heat loss to the substrate, thereby improving energy efficiency while maintaining a relatively simple overall structure.
Solution Approach 2:
Cavity portions are selectively formed only in regions where heat generating portions are located, creating local thermal isolation. This local quality change allows heat to be concentrated where needed without requiring global structural modifications, thus improving energy efficiency with minimal increase in device complexity.
2Manufacturing precision
If heat generating portions are arranged closely to improve printing resolution, then print quality improves, but heat distribution becomes uneven and adjacent heat generating portions interfere with each other
Solution Approach 1:
Cavity portions are formed between adjacent heat generating portions to segment the thermal fields. This segmentation prevents heat from one heat generating portion from interfering with adjacent portions, allowing them to be arranged closely for high resolution while maintaining uniform heat distribution through the printing medium.
3Strength
If the substrate thickness is increased to improve mechanical strength, then structural reliability improves, but heat transfer to the printing medium becomes less efficient
Solution Approach 1:
Cavity portions are formed locally in the substrate at positions corresponding to heat generating portions, creating thermal pathways that bypass the need for thick substrate material. This local modification maintains mechanical strength in non-cavity regions while improving heat transfer efficiency at critical locations.
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 design effectively suppresses heat loss, enhances printing energy efficiency, and maintains print quality by ensuring consistent heat transfer to the printing medium, even with misalignment or variations in the platen roller.
Implementation Method 1
the heat generating portions of the resistor layer generate heat when energized
Implementation Method 2
an insulating layer interposed between the substrate and the resistor layer
Implementation Method 3
the substrate has a cavity portion overlapping the plurality of heat generating portions when viewed in a thickness direction of the substrate
Data Source
AI summary
A thermal print head includes: a substrate; a resistor layer supported by the substrate and including a plurality of heat generating portions arranged in a main scanning direction; a wiring layer supported by the substrate and forming an energizing path to the plurality of heat generating portions; and an insulating layer interposed between the substrate and the resistor layer, wherein the substrate has a cavity portion overlapping the plurality of heat generating portions when viewed in a thickness direction of the substrate.