Patent ID: 7637683

Claim:
A mirror adjustment apparatus including a sliding structure forming a movable connection between at least two components, comprising: a first spherically curved sliding part having a first sliding surface and a central bore; a second spherically curved sliding part having a second sliding surface facing and complementary of said first sliding surface and a central bore; a connector passing through said central bores binding said first and second sliding surfaces together under pressure, which is less than 10 N/mm 2 ; and one of said first and second of said sliding surfaces having a base surface having a plurality of projections each being rounded off to present a convex surface having tangential sliding surfaces in sliding contact with and complementary of, the oppositely disposed sliding surface forming a contact surface contacting the other of said first and second of said sliding surfaces; such that the force required to overcome the static friction between said first and second sliding surfaces is increased, but is only slightly greater than the force necessary to overcome sliding friction, thus substantially eliminating hysteresis-lag.