Wide slit nozzle and coating method by wide slit nozzle

A coating method by a wide slit nozzle comprising a slit as a discharge opening for a coating material.

• the slit having a thickness parallel to a coating thickness direction of the coating material and a width perpendicular to the coating thickness direction, the thickness of the slit being smaller in dimension than the width of the slit so that the coating material is coated while a size of the slit being set in a two-dimensional direction;
• the slit having a fixed thickness part located at a lateral center part and a pair of changing thickness parts located at a pair of lateral end parts, the fixed thickness part having a fixed thickness parallel to the coating thickness direction, and each of the changing thickness parts changing a thickness parallel to the coating thickness directions so that the thickness of the changing thickness part decreases linearly from a corresponding lateral end of the fixed thickness part to a corresponding lateral end of the slit;
• the wide slit nozzle being used such that a plurality of the coating materials is discharged from a plurality of the slits, respectively, so that the coating materials are disposed in parallel on a surface of an object to be coated, while adjacent lateral end parts of the coating materials being overlapped on each other, whereby each of the coating materials has a first thickness at a first part where the coating materials are not overlapped and a second thickness at a second part where the coating materials are overlapped;
• and
• wherein the coating material discharged from the thickness changing parts of the slit defines an overlapped portion at the adjacent lateral end parts of the coating materials disposed on the surface of the object to be coated.