VIS-INFRARED CORRECTIV FISHEYE LENS SYSTEM FOR EXTREME TEMPERATURES

摘要

An vis-infrared corrective fisheye lens system is provided with, from upstream to downstream, a first lens of negative meniscus, a second lens of biconcave, a third lens of biconvex, an aperture, a fourth lens of biconvex, a fifth lens of negative meniscus, a sixth lens of biconvex, an exchangeable optical filter, and an imaging plane. The lens system has an ultra wide angle of about 210-degree and is capable of operating in a temperature range of −15° C.-80° C. so that the lens system can be mounted in a surveillance system in a vehicle or an outdoor place.

主权项

1. A vis-infrared corrective fisheye lens system comprising:
a first lens of negative meniscus having a convex surface toward the object plane; a second biconcave lens nearby paraxial optical axis disposed downstream of the first lens and having a concave surface toward the first lens; a third lens of biconvex disposed downstream of the second lens and having a convex surface toward the first lens; an aperture disposed downstream of the third lens; a fourth lens of biconvex disposed downstream of the aperture and having a convex surface toward the first lens; a fifth lens of negative meniscus disposed downstream of the fourth lens and having a concave surface toward the first lens; a sixth lens of biconvex lens nearby paraxial optical axis disposed downstream of the fifth lens and having a convex surface toward the first lens; an exchangeable optical filter disposed downstream of the sixth lens; and an imaging plane disposed downstream of the exchangeable optical filter.