Spliced ​​thermal print head and manufacturing method thereof

By using aluminum nitride and aluminum oxide composite linings and thermally conductive silicone with matching thermal expansion coefficients in the spliced ​​thermal print head, the problems of substrate extrusion and edge collapse caused by differences in material thermal expansion coefficients are solved, achieving high-quality, high-speed wide-format printing effects.

CN117400638BActive Publication Date: 2025-09-23SHANDONG HUALING ELECTRONICS
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Patent Information

Application Number
CN202311636718.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-01
Publication Date
2025-09-23
Estimated Expiration
2043-12-01

AI Technical Summary

Technical Problem

Existing spliced ​​thermal print heads may experience product defects such as substrate extrusion and substrate edge collapse at the joints due to differences in thermal expansion coefficients of different materials at high temperatures, affecting the printing effect.

Method used

A composite lining of aluminum nitride and aluminum oxide with matching thermal expansion coefficients is set on the metal heat dissipation platform, and type B and type C thermal printing units are staggered on the surface of the lining. Thermal conductive silicone or thermal conductive silicone grease is combined with a stepped protective layer to ensure good heat dissipation and stable splicing.

Benefits of technology

It effectively narrows the gaps at the joints, avoids substrate extrusion and cracking, improves printing quality and speed, and meets the needs of wide-format printing over 1m.

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Abstract

The present invention relates to the field of thermal print head manufacturing technology, and more specifically, to a spliced ​​thermal print head suitable for wide-format printing and a manufacturing method thereof, wherein the spliced ​​thermal print head is provided with a metal heat sink, and two or more adjacent thermal printing units are provided on the surface of the metal heat sink. The spliced ​​thermal print head is characterized in that a thermal expansion coefficient of 4x10 ‑6 ‑9x10 ‑6 An aluminum nitride and aluminum oxide composite lining having a thickness ranging from 0.2 to 10 cm and an aluminum nitride and aluminum oxide composite lining having a thickness ranging from 0.2 to 10 cm, wherein two or more adjacent thermal printing units are arranged on the lining, and the aluminum nitride and aluminum oxide composite lining contains Al6O3N4, Al8O3N6, Al5O6N and Al7O3N5 crystal phases.
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Citation Information

Patent Citations

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  • Novel wide-width thermal-sensitive printing head and manufacturing method thereof

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  • Splicing type thermal printing unit, thermal printing head and assembling method of thermal printing head

    CN113771503A

  • Thermal printing head substrate with composite lead-free protective layer and manufacturing method of thermal printing head substrate

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