The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2025
Filed:
Mar. 18, 2024
Screen Holdings Co., Ltd., Kyoto, JP;
Yasushi Oshima, Kyoto, JP;
SCREEN Holdings Co., Ltd., Kyoto, JP;
Abstract
A controller for an inkjet printing apparatus outputs a test drive signal for printing a test pattern to a piezoelectric element of a head. The test drive signal includes a first frequency corresponding portion in which first and second waveforms are combined in a first ratio, and a second frequency corresponding portion in which the first and second waveforms are combined in a second ratio different from the first ratio. This allows printing of a test pattern in which a drive frequency is changed in a pseudo manner while a recording medium is transported at a constant speed. Thus, the head is inspected for abnormalities occurring in response to the drive frequency.