| 摘要 |
Provided are a method of precisely evaluating the performance of an optical sensor including light-emitting elements corresponding to light-emitting wavelengths respectively representing multiple colors as well as a light-receiving element even under a condition in which mists of color inks adhere to the sensor, and a printing apparatus for carrying out the method. To this end, how much the performance of the optical sensor mounted on a carriage decreases is evaluated based on a cumulative number of ejections for each ink color, which number corresponds to the amount of mist, and a degree at which each ink affects each color LED. This makes it possible to precisely evaluate the performance of the optical sensor including the light-emitting elements corresponding to the light-emitting wavelengths respectively representing the multiple colors as well as the light-receiving element even under the condition in which the mists of the color inks adhere to the sensor.
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