US 12,434,472 B2
Ejection state determination method, ejection state determination apparatus, and non-transitory computer-readable storage medium storing ejection state determination program
Atsushi Toyofuku, Shiojiri (JP); and Toshiro Murayama, Fujimi (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jun. 27, 2023, as Appl. No. 18/341,817.
Claims priority of application No. 2022-103309 (JP), filed on Jun. 28, 2022.
Prior Publication US 2023/0415477 A1, Dec. 28, 2023
Int. Cl. B41J 2/045 (2006.01); B41J 2/21 (2006.01)
CPC B41J 2/04536 (2013.01) [B41J 2/04586 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An ejection state determination method for determining an ejection state of a liquid ejecting head in which a plurality of nozzles for ejecting a liquid in a first direction are arranged in a second direction intersecting the first direction, the ejection state determination method comprising:
a first obtaining step of obtaining a plurality of pieces of multi-valued data of an image including a plurality of pixels by capturing, at one timing, an image of a droplet ejected from one nozzle selected from the plurality of nozzles, the first obtaining step further including:
capturing the image against a background of a light source; and
removing noise from the plurality of pieces of multi-valued data using a background image corresponding to the background in the image;
a second obtaining step of obtaining determination information from the plurality of pieces of multi-valued data; and
a determining step of:
determining whether a value indicated by the determination information satisfies a predetermined condition; and
determining the ejection state based on a result of the determination, wherein
the second obtaining step includes a calculating step of calculating the value indicated by the determination information based on all of the plurality of pieces of multi-valued data indicating the droplet from which the noise has been removed in the first obtaining step.