A system of remote computer service including a call center, the Internet and a computer service supporting system. The controller controls driving of the at least three actuators in accordance with a difference between the calculated coordinates and predetermined coordinates, so that the center of curvature of the spherical mirror is held fixed to the predetermined coordinates. In particular, the present invention includes nanometer scale impact masses that reduce the velocity of working substance molecules that collide with this impact mass by converting some of the kinetic energy of a colliding molecule into kinetic energy of the impact mass. The housing member 5 also has a ventilation port 8 formed to communicate with the first region A and equipped with an anti-dust filter.