Patent ID: 8797660

Claim:
A mechanism for precisely arranging two optical elements, comprising: an annular first mounting member having a first optic axis and a first protrusion, the first mounting member including supports configured for supporting an optical element to extend across a central aperture in the first mounting member; an annular second mounting member having a second optic axis and a second protrusion, the second mounting member including supports configured for supporting an optical element to extend across a central aperture in the second mounting member; wherein the first and second mounting members are concentrically stacked together about a central axis with the first and second optic axes defining between them an optics angle; guide slots formed in each of the first and second mounting members; guide pins extending through the guide slots and configured for selectively permitting and preventing rotational motion between the first and second mounting members about the central axis; and an actuator located near the first mounting member and operable for rotating the first mounting member for varying the size of the optics angle.