Liquid dispensing device, head unit control circuit, and liquid dispensing inspection method

The liquid dispensing device addresses noise interference in discharge state inspections by generating independent inspection signals for each unit, enhancing accuracy and reducing inspection time in liquid ejection devices.

JP2026055263APending Publication Date: 2026-03-31SEIKO EPSON CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-18
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Conventional liquid ejection devices face challenges in accurately inspecting the discharge state due to noise superimposed on inspection signals, leading to increased inspection time and the need for information from multiple periods of detection signals.

Method used

A liquid dispensing device with first and second dispensing units generates inspection and reference signals based on residual vibration signals, allowing independent determination of each unit's state without relying on correction information from the other, and includes a head unit control circuit to manage these processes.

Benefits of technology

This approach enhances inspection accuracy by reducing the reliance on multiple period data, thereby shortening inspection time and improving the reliability of discharge state assessments.

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Abstract

This reduces the inspection time required to determine the condition of the discharge unit D. [Solution] The inkjet printer 1 includes a signal generation unit 60A that generates a comparison signal CP1[j] based on a residual vibration signal VD[j] and a comparison signal CP1[i] based on a residual vibration signal VD[i], a determination unit 64B that determines the state of each of the ejection units D[j] and D[i], and a storage unit 5 that stores reference set timings rts1[j] and rts1[i]. The determination unit 64B determines the state of the ejection unit D[j] using time information NTC1[j] generated based on the reference set timing rts1[j] and the comparison signal CP1[j], without using the reference set timing rts1[i], and determines the state of the ejection unit D[i] using time information NTC1[i] generated based on the reference set timing rts1[i] and the comparison signal CP1[i], without using the reference set timing rts1[j].
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Citation Information

Patent Citations

  • Liquid discharge device

    JP2015174267A