Dual image viewer with mirror adjusting means

Claim 1

A dual image viewer comprising: a first enclosure having a first entrance for admitting light, a first optical path for light and a first exit for light; a second enclosure having a second entrance for admitting light, a second optical path for light and a second exit for light, the second optical path intersecting the first optical path near the second exit; a semireflective mirror interposed along the first optical path where the second optical path intersects the first optical path, so that at least a portion of the light entering the first entrance is transmitted through the surface towards the first exit and at least a portion of the light entering the second entrance is reflected by the surface and deflected generally along the first optical path towards the first exit; a second mirror within the second enclosure for reflecting the light entering the second enclosure towards the first optical path; the second mirror being at an angle with the second optical path, the viewer including means for changing the angle to vary the position on the semireflective mirror where light from the second optical path strikes and thereby varying the position of light from the second optical path leaving the first exit, said means for changing the angle comprising means hingedly connecting the second mirror to the second enclosure and a thumb screw threadedly received in the rear end of the second enclosure and contacting the second mirror; and a mount for mounting the viewer on an infrared scanner so that a visual image converted from an infrared image by the scanner enters the first entrance and a corresponding visual image enters the second entrance, producing two coincident or adjacent images visible through the first exit.