Patent ID: 9448391
Filing Date: 2016-09-20
CPC Classification: G02B,H04N

Claim Text:
1. A zoom lens assembly for surveillance, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens, which are arranged successively coaxially along a transmission direction of an incident light beam; the first, the eighth, the tenth, and the twelfth lenses are positive biconvex lenses; the second, the ninth, and the eleventh lenses are negative meniscus lenses; the third, the fourth, the sixth and the thirteenth lenses are positive meniscus lenses; the fifth lens is a negative biconcave lens; and the seventh lens is a negative plano-concave lens; the second lens and the third lens are closely attached to each other, and the sixth lens and the seventh lens are closely attached to each other; intermediate parts of the second, the third, the fourth, and the thirteenth lenses are convex toward a direction reverse to the transmission direction of the incident light beam; intermediate parts of the sixth, the ninth, and the eleventh lenses are convex toward the transmission direction of the incident light beam; the fifth, the sixth, and the seventh lenses are capable of moving synchronously along a direction of optical axis.