METHOD AND APPARATUS FOR MEASURING INK JETTING AMOUNT, PRINTER, AND MEASURING METHOD FOR INK JET AMOUNT OF THE PRINTER

摘要

PROBLEM TO BE SOLVED: To instantaneously obtain an jetting amount of ink from a nozzle by detecting density of ink dot or line pattern formed with the ink jetted from head. SOLUTION: Windows (to obtain an image by scanning m pixels in a width direction of a line pattern) made of n×m of pixels are provided for an image of a line pattern to be measured by capturing it by a line sensor camera to obtain luminance Qnm of each pixel. And, windows of the same size are provided for an image captured on a part having no line pattern to obtain an image reference luminance Inm of each image at that time. At each corresponding pixel, a pixel density Dnm=Log (pixel reference luminance Inm/pixel luminance Qnm) is calculated, the density Dnm is added in the case of n=1 to n, and m=1 to m to obtain density of the entirety in the windows. An ink amount per one time jetting of a nozzle for printing a line pattern is obtained by using a calibration curve from the obtained density.