Thermal printhead, method of manufacturing the same, and thermal printer
By employing a protective film design with grooves and a thin film structure in the thermal printhead, the problem of low heat transfer efficiency caused by excessively thick protective film is solved, thereby improving the printing performance of high-precision and high-speed printing.
CN115195304BActive Publication Date: 2026-06-05ROHM CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ROHM CO LTD
- Filing Date
- 2022-04-13
- Publication Date
- 2026-06-05
AI Technical Summary
Technical Problem
In existing thermal printheads, excessively thick protective films reduce heat transfer efficiency and affect printing performance during high-speed, high-precision printing.
Method used
The structure employs a first protective film with a groove and a thinner second protective film. The heating resistor is embedded in the groove, and the comb-like portion of the independent electrode and the common electrode are separated to ensure effective heat transfer.
Benefits of technology
It achieves excellent printing performance, reduces poor pattern shape of heating resistors, and improves printing accuracy and efficiency.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN115195304B_ABST
Abstract
The present application provides a thermal print head capable of ensuring good printing performance. In addition, a manufacturing method of the thermal print head is provided. Furthermore, a thermal printer having the thermal print head is provided. The thermal print head (100) includes: an insulator; a heat storage layer (33) disposed on the insulator; a protective film (34A) disposed on the heat storage layer (33) and having a groove portion (38); and a heat generating resistor (40) disposed on the heat storage layer (33) and embedded in the groove portion (38); a separate electrode (31) electrically connected to the heat generating resistor (40); a common electrode (32) having a comb tooth portion (32A) and electrically connected to the heat generating resistor (40); and a protective film (34B) covering the heat generating resistor (40) and the protective film (34A), the separate electrode (31) being separated from the comb tooth portion (32A) of the common electrode (32) by a gap and being opposite to the comb tooth portion (32A).
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