Detecting device, droplet discharging device, and detecting method

A detecting device for detecting a discharge state of droplets from a discharging head configured to discharge the droplets onto a medium, the detecting device comprising:

• an irradiation unit configured to irradiate the medium on which a predetermined pattern is recorded with the droplets with irradiation light, and to scan the medium with the irradiation light in a scanning direction;
• a light-receiving unit configured to receive reflected light which is the irradiation light reflected by the medium, and to output a signal indicating intensity of the reflected light;
• and
• a control unit configured to perform determination process for determining the discharge state of the droplets onto the medium by using intensity change of the reflected light in scanning the predetermined pattern in the scanning direction,
• wherein the light-receiving unit includes an optical sensor having a lower resolution than a printing resolution of the discharging head.