Print Head Modulation Frequency Switching for Temperature Sensing

The patent uses the vibration plate as an intermediary element that transmits temperature information from the pressure chamber to the temperature detection portion located outside the print head. The vibration plate's deformation, caused by temperature changes in the pressure chamber, serves as a mechanical mediator that conveys thermal information without requiring direct thermal contact between the detector and the pressure chamber, thus maintaining detection accuracy while simplifying the overall structure.

The patent replaces direct thermal measurement (mechanical/thermal contact) with indirect measurement through mechanical deformation. Instead of placing a thermal sensor inside the pressure chamber, the system uses the vibration plate's mechanical deformation response to temperature changes as a substitute measurement mechanism, achieving accurate temperature detection without complex internal sensor placement.

The patent employs periodic action by increasing the frequency of the amplification modulation signal only during temperature detection periods rather than maintaining high frequency continuously. The drive signal output circuit operates in cycles: during temperature detection, it uses high frequency for accurate measurement, and during normal operation, it returns to lower frequency to conserve energy. This periodic switching between high and low frequency modes resolves the contradiction between detection accuracy and energy consumption.

The patent dynamically changes the frequency parameter of the drive signal based on operational requirements. When temperature detection is needed, the frequency is increased to improve detection accuracy; when detection is not required, the frequency is reduced to minimize energy consumption. This parameter adjustment strategy allows the system to optimize between measurement precision and energy efficiency according to real-time needs.