Abstract: A needleless connector module, including: a flow guiding member having a flow guiding channel connecting to a upper portion of the flow guiding member, the upper portion including an ultrasonic welding portion thereon; an elastic valve; and a sleeve tube having an inner annular bottom surface formed on an inner wall of a base portion of the sleeve tube, an limiting portion of annular wall being defined by the inner wall of the base portion, the sleeve tube is sleeved on the elastic valve and assembled with the flow guiding member to allow the inner annular bottom surface to contact with the ultrasonic welding portion and let the limiting portion of the annular wall annularly cover a base side portion of the flow guiding member, so as to improve success of ultrasonic welding between the ultrasonic welding portion and the limiting portion of annular wall.

Abstract: A metal mask is provided. The metal mask includes a mask portion and an end portion. The mask portion has a mask body and an outer frame surrounding and being connected to the mask body. The end portion connects one end of the mask portion. At least one of the mask portion and the end portion has at least one recessed portion located outside the mask body. The ratio of a total capacity of the at least one recessed portion to a total volume of the mask portion and the end portion is between 0.087 and 0.667.

Abstract: A metal mask is provided. The metal mask includes a mask portion and an end portion. The mask portion has a mask body and an outer frame surrounding and being connected to the mask body. The end portion connects one end of the mask portion. At least one of the mask portion and the end portion has at least one recessed portion located outside the mask body. The ratio of a total capacity of the at least one recessed portion to a total volume of the mask portion and the end portion is between 0.087 and 0.667.