| 摘要 |
A light blocking member is formed of a light absorbing material and arranged across a straight line extending between a radiating position on a substrate onto which a laser beam is radiated and a nozzle. The light blocking member is formed by a rectangular frame projecting from a nozzle surface of the nozzle plate toward the substrate. The light blocking member is arranged so as to encompass the outer circumference of the nozzle. The blocking height of the light blocking member is set to a value equal to the sum of the blocking width and the nozzle diameter. The light blocking member blocks reflected diffuse light that has been reflected and diffused at the radiating position.
|
