A process for the preparation of a compound of the formula wherein the substituents are defined as in the specification. The main body is formed with a vertical main plate and a side plate. A FEM grid model is created to represent the structures using a plurality of solid elements which represents geometry and material properties. Another aspect is related to systems and methods for scanning multiple regions. The connecting wirings and the scanning electrodes are electrically connected to each other at connecting regions provided in the sealing portion, and a shielding is provided between the image display portion and the sealing portion. The ball joint assembly may comprise a ball joint configured for attachment to a coupling rod.