DROPLET VOLUME MEASURING DEVICE DROPLET VOLUME MEASURING METHOD SUBSTRATE FOR MEASURING DROPLET VOLUME AND INKJET DRAWING APPARATUS

摘要

The present invention accurately measures a volume of droplets discharged by an inkjet way. A central shaft of a ring-shaped light source (17) and a light shaft of a camera (11) are coincident, and passes a pitch of a droplet (L) on an upper portion of the droplet (L) on a measuring substrate (S). In addition, the ring-shaped light source (17) and the camera (11) are placed such that a diameter direction of the ring-shaped light source (17) is parallel with a surface of the measuring substrate (S). While the ring-shaped light source (17) is lighted, a radius (x) of a circumference of a light reflected from a light irradiated to the droplet (L) from the ring-shaped light source (17) is obtained based on the images captured of the droplet (L) by the camera (11). While a light is irradiated to the droplet (L) from a lower side of the measuring substrate (S), a radius (A) of the droplet (L) is obtained based on the images captured of the droplet (L) by the camera (11). The volume of the droplet (L) is calculated using the radius (x) and the radius (A).