Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B41
PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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B41J
TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
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2/00
Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
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B41J2/005
characterised by bringing liquid or particles selectively into contact with a printing material
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B41J2/175
Ink supply systems; ; Circuit parts therefor
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B41J2/17566
Ink level or ink residue control
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B41J2002/17583
using vibration or ultra-sons for ink level indication
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B41J2002/17583

Liquid ejection apparatus and determination method capable of determining whether or not liquid filling of pressure chamber has been completed
12447741 · 2025-10-21 · ·

A liquid ejection apparatus includes a nozzle, a pressure chamber, a piezoelectric element, an output processing portion, and a determination processing portion. The nozzle ejects a liquid. The pressure chamber communicates with the nozzle and contains the liquid. The piezoelectric element changes a pressure in the pressure chamber in response to an input of a drive signal. The output processing portion causes the piezoelectric element to output a first electric signal corresponding to vibration generated in the pressure chamber in response to the input of the drive signal to the piezoelectric element. The determination processing portion determines whether or not the pressure chamber is in a filled state in which the pressure chamber is filled with the liquid, based on a frequency of the first electric signal output by the output processing portion.