Patent ID: 7440099

Claim:
A droplets detecting system configured for detecting droplets jetted out from a same ink-jet nozzle, comprising: a first laser diode assembly configured for emitting a first laser light to pass through the droplet, the first laser diode assembly being immoveable relative to the ink-jet nozzle; a first photo diode configured for receiving the first laser light passing through each droplet and for thereby generating a first electronic signal; a light source structured and arranged for emitting an illuminating light to illuminate the droplet passed through by the first laser light, wherein the first laser diode assembly and the light source are arranged in a manner to illuminate the droplet from different directions; a charge coupled device camera configured for receiving the illuminating light and thereby photographing the illuminated droplet; a signal processing and displaying device connected with the first photo diode, the signal processing and displaying device being configured for displaying the first electronic signal generated by the first photo diode; and an image processing and displaying device operatively connected with the charge coupled device camera, the image processing and displaying device being configured for displaying an enlarged image of the droplet.