Method for measuring amount of positional deviation and image-recording device

摘要

Dot patterns are recorded on a recording medium at intervals determined in advance in a second direction using first and second head modules while relatively moving a recording head and the recording medium in the second direction. The dot patterns are optically read, and a density profile representing change in density in the second direction of a read image of the dot patterns is calculated. A repetition period of a waveform corresponding to each dot pattern in the density profile is calculated, and data of the density profile is integrated and averaged in each repetition period to calculate an integrated density profile. A peak position of a waveform corresponding to each dot pattern in the integrated density profile is obtained, and the amount of positional deviation is calculated based on each peak position.

主权项

1. A method for measuring an amount of positional deviation between recording positions of a plurality of head modules, the method comprising:
a recording step of, while relatively moving a recording head with a plurality of head modules each having a plurality of recording elements arranged in a first direction and a recording medium in a second direction orthogonal to the first direction, recording dot patterns having a shape extended in the first direction on the recording medium at intervals determined in advance in the second direction using a first head module and a second head module among the plurality of head modules; a reading step of optically reading the dot patterns recorded on the recording medium in the recording step; a density profile calculation step of calculating a density profile associated with the first head module representing change in density in the second direction of a read image of the dot patterns read in the reading step; a repetition period calculation step of calculating a repetition period of a waveform corresponding to each dot pattern in the density profile based on a calculation result in the density profile calculation step; an integrated density profile calculation step of integrating data of the density profile based on a calculation result of the repetition period calculation step in each repetition period to calculate an integrated density profile associated with the first head module; and a positional deviation amount calculation step of obtaining a peak position of a waveform corresponding to each dot pattern in the integrated density profile based on a calculation result of the integrated density profile calculation step and calculating the amount of positional deviation in the second direction between a recording position of the first head module and a recording position of the second head module based on the peak position and another peak position associated with the second head module.