Mirror assembly

摘要

A rotatable mirror assembly is described comprising a spherical housing (1) rotatable about an axis (A). The housing contains a mirror (2) bonded in the rear end of the housing. The housing at the front of the mirror (2) has a flange (3) while a second enlarged flange (4) is formed at the rear of the mirror (2). The front of the mirror (2) has a sloping end face (5) at an angle of 45‹ of the rotary axis (A) which faces toward an opening (6) in the side of the housing (1). The opening (6) in a first embodiment is closed by an optically flat sapphire window (7) bonded into the opening (6) and in a second embodiment has a curved lens (16, 17) mounted in the aperture. The improved assemblies reduce noise generation of high speed rotating mirrors and prevent the deposit of small particles of dust on the mirror surface.