公开(公告)号：US11338578B2

公开(公告)日：2022-05-24

申请号：US17079029

申请日：2020-10-23

Applicant: SEMES CO., LTD.

Inventor： Kwangsup Kim ,  Dongok Ahn ,  Junho Oh ,  Ji Hoon Yoo ,  Myeong Jun Lim

IPC: B41J2/045

Abstract: An inspection module is disclosed for inspecting a droplet from an ink jet head. The inspection module includes a sensor located under the ink jet head and measuring a distance between the droplet and the sensor in real time; a variable lens changing an operating distance based on the measured distance of the sensor; and a camera for capturing an image of the droplet. The inspection module further includes a droplet inspecting part inspecting the droplet image captured by the camera.