Patent ID: 7515345

Claim:
An objective lens assembly for forming an image of an object, comprising: a first prism having, in sequence of light propagation from the object, a first transmitting surface A, a reflecting surface B and a second transmitting surface C, the first transmitting surface A being operatively configured to pass light from the object to the reflecting surface B, the reflecting surface B being operatively configured to reflect the passed light towards the second transmitting surface C, the second transmitting surface C being operatively configured to allow the reflected light from the reflecting surface B to pass through and exit the first prism; a second prism having, in sequence of light propagation from the object, a first transmitting surface D, a reflecting surface E and a second transmitting surface F, the first transmitting surface D being operatively configured to pass the light exiting the first prism to the reflecting surface E, the reflecting surface E being operatively configured to reflect the passed light towards the second transmitting surface F, the second transmitting surface F being operatively configured to allow the reflected light from the reflecting surface E to pass through and exit the second prism; wherein the first prism has a first local coordinate system having a local X-axis, a local Y-axis, and a local Z-axis that intersects the first transmitting surface A of the first prism, the first prism being rotated a first predetermined angle about the local Z-axis of the first prism, and wherein the second prism has a second local coordinate system having a local axis that intersects the first transmitting surface D of the second prism and is aligned with one of the local X-axis and the local Y-axis of the rotated first prism, the second prism being rotated a second predetermined angle about the local axis of the second prism.