Patent ID: 8801202
Filing Date: 2014-08-12
Classification: G02B

Abstract:
1. A coude gimbal structure comprising: a two-axis gimbal system including an outer gimbal pivotable about a first rotational axis, and an inner gimbal supported on the outer gimbal and pivotable about a second rotational axis which is perpendicular to the first rotational axis and which intersects the first rotational axis at an intersection point; and a reflective coude optical system including a positive-optical-power primary mirror mounted to the inner gimbal, wherein the primary mirror is directed along a third axis passing through the intersection point and lying perpendicular to the first rotational axis and perpendicular to the second rotational axis, and an intersection flat fold mirror at the intersection point, wherein the positive optical power primary mirror has a primary mirror aperture diameter, and wherein a coude path length of the reflective coude optical system is about ½ of the aperture diameter of the primary mirror.