Abstract: A mechanism for connecting first and second members through a sealing member sandwiched therebetween includes a position adjustment portion which adjusts a position of the first member in a direction substantially perpendicular to a surface of the second member with respect to the sealing member arranged on the second member, a reference portion which is provided to the second member and has a reference surface substantially perpendicular to the surface of the second member, and a pressing portion which presses the first member in a direction substantially parallel to the surface of the second member against the reference surface of the reference portion. A positioning member is provided to the first member and comes into contact with the reference surface of the reference portion, with the positioning member being position-adjustable with respect to a reference position of the first member.

Abstract: An assembly having first and second members arranged through a sealing member sandwiched between them is disclosed. The second member has a reference portion having a reference surface. The assembly includes a pressing portion which presses the first member against the reference surface in a direction substantially parallel to a surface of the second member. The second member is fixed to the first member while the first member abuts against the reference surface and the sealing member is compressed between the first and second members.