To provide a nozzle ejection state measuring device which can inspect at a high speed a state of ejection from many nozzles to an inkjet head having many nozzles, also can correspond to various types of ink, and can highly accurately measure an ejection bend and an ejection liquid droplet size.
The nozzle ejection state measuring device includes: a medium 103 for receiving liquid droplets 102 ejected from the ink jet head 101, which has a flat and liquid-repellent surface; a line sensor 105; an imaging optical system 106; an illumination device 107 for illuminating the surface of the recording medium 103; and a processing device for processing a signal acquired from the line sensor 105 to calculate the state of ejection of a liquid ejected from a nozzle. In the nozzle ejection state measuring device, the illumination device 107 is disposed at a position to be irradiated at an angle where specular reflection light from the surface of medium 103 is not incident on the line sensor and part of specular reflection light from the liquid droplet surface ejected on the surface of the medium is incident on the line sensor.
COPYRIGHT: (C)2011,JPO&INPIT
Takeo Tsukamoto
Aino Hasegawa
Takeshi Orito
Usui Yuma
Ryota Suzuki
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Toru Kabayama