Liquid discharge apparatus, liquid discharge system, and liquid discharge method

A liquid discharge apparatus comprising:

• at least one head to discharge liquid onto a conveyed object, the at least one head to move in an orthogonal direction orthogonal to a conveyance direction of the conveyed object;
• a first light source disposed upstream from the at least one head in the conveyance direction, to irradiate the conveyed object;
• a second light source disposed downstream from the at least one head in the conveyance direction, to irradiate the conveyed object with light having a high relative intensity in a range of wavelength in which a relative reflectance of the liquid is high;
• and.
• a detector including:
• a first optical sensor configured to perform imaging of the conveyed object being irradiated by the first light source, to generate first data;
• and
• a second optical sensor configured to perform imaging of the conveyed object being irradiated by the second light source, to generate second data,
• wherein the detector is configured to generate a detection result based on the first data and the second data, the detection result including at least one of a conveyance amount of the conveyed object and a conveyance speed of the conveyed object.

A liquid discharging method comprising:

• discharging liquid onto a conveyed object;
• irradiating the conveyed object with light having a high relative intensity in a range of wavelength in which a relative reflectance of the liquid is high;
• generating data of an irradiated portion of the conveyed object;
• and
• generating a detection result based on the data, the detection result including at least one of a conveyance amount of the conveyed object and conveyance speed of the conveyed object.