Variofocusing monitoring shot and monitoring device

摘要

A zoom lens assembly for monitor and a monitoring device are provided. The lens assembly comprises a first to a thirteenth lenses (L1-L13) arranged successively coaxially along the transmission direction of an incident light beam. The first, the eighth, the tenth and the twelfth lenses (L1, L8, L10 and L12) are biconvex positive lenses; the second, the ninth and the eleventh lenses (L2, L9 and L11) are falcate negative lenses; the third, the fourth, the sixth and the thirteenth lenses (L3, L4, L6 and L13) are falcate positive lenses; the fifth lens (L5) is a biconcave negative lens; and the seventh lens (L7) is a plano-concave negative lens. The second and the third lenses (L2 and L3) are closely adhered to each other, and the sixth and the seventh lenses (L6 and L7) are closely adhered to each other. The intermediate parts of the second, the third, the fourth and the thirteenth lenses (L2, L3, L4 and L13) are all convex toward a direction reverse to the transmission direction an incident light beam; the intermediate parts of the sixth, the ninth and the eleventh lenses (L6, L9 and L11) are all convex toward the transmission direction of the incident light beam; and the fifth, the sixth and the seventh lenses (L5, L6 and L7) can move synchronously along a light axis direction. The shot can realize all-weather, wide-range and variofocusing monitoring. The shot has a high imaging sharpness and a simple structure; and the cost of the material is low, thus controlling the manufacturing cost effectively.

主权项

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.