Abstract: 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.

Abstract: 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.

Abstract: At least one exemplary embodiment is directed to a sensor for measuring the distance between the sensor and a measuring surface, which includes a light-emitting element and a plurality of light-receiving elements. The light-receiving elements are arranged so that the light axes thereof do not cross one another.

Abstract: 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.

Abstract: At least one exemplary embodiment is directed to a sensor for measuring the distance between the sensor and a measuring surface, which includes a light-emitting element and a plurality of light-receiving elements. The light-receiving elements are arranged so that the light axes thereof do not cross one another.

Abstract: At least one exemplary embodiment is directed to a recording apparatus, which includes a sensor having a plurality of light-emitting elements and a plurality of light-receiving elements. The sensor can be configured to perform a detection operation. The detection operation includes at least two of an operation for detecting an edge of a recording medium, an operation for detecting a distance between a recording head and the recording medium, an operation for detecting the density of an image formed on the recording medium, and an operation for detecting the kind of the recording medium.