| 摘要 |
<p>An optical system for a night vision video camera (5) having a pair of mirrors (12, 18) with an optical prescription providing f/2.8 speed and 50 line pairs per line millimeter resolution to an image intensifier (22) located between the two mirrors on the common optic axis of the mirrors. The mirror (12) first receiving the image to be viewed is an f/4 parabolic mirror and the second mirror (18) is an f/10 spherical mirror with external diameter of about forty percent of the diameter of the parabolic mirror (12) (i.e. the obturation ratio is about 0.40). The second mirror (18) receives the reflected image of the object viewed by the night vision video camera (5) from the first mirror (12) and reflects the image to the image intensifier (22). The image may be viewed at an external view finder (24) and can also be recorded.</p> |
