Mount for an optical element including a holder with a generally semicylindrical surface

Claim 1

A mount for an optical element, said mount being adjustable to position said element relative to an optical axis, said element being adapted to receive an input light beam along said axis and to direct an output light beam away from the element, said mount comprising: a holder for said optical element, said holder having a generally semicylindrical surface portion; first means for supporting said holder for rotation about said optical axis, said first means having generally cylindrical end portions and a generally cylindrical bearing surface which cooperates with said surface portion, said holder upon rotation moving said output beam along a first generally straight line; and second means for supporting said first means for rotation about a second axis generally perpendicular to said optical axis, said second means being adapted to receive said end portions for rotational movement therein, said first means upon rotation moving said output beam along a second generally straight line perpendicular to said first straight line whereby said output beam can be positioned within the confines of a rectangular cone by rotation of said holder and said first means.