Coaxial type super remote distance fold-back low-light ranging night vision big camera lens

Abstract

The invention discloses a coaxial type super remote distance fold-back low-light ranging night vision big camera lens and relates to the field of imaging devices. The coaxial type super remote distance fold-back low-light ranging night vision big camera lens comprises a convexo-plane first lens, a concavo-convex second lens which is provided with a single-sided negative refraction capacity and a center single-sided reflection capacity, a hollow concave third lens with a single-sided reflection capacity, a convex-concave bonding lens arranged at the hollow center of the third lens, a laser emission camera lens which is coaxial with the first lens and arranged on an objective image end, and a laser receiving mirror which is coaxial with the third lens and is arranged on the imaging end, wherein the convexo-plane first lens, the concavo-convex second lens, the third lens, the convex-concave bonding lens, the laser emission camera lens and the laser receiving mirror are arranged from the objective image end to the imaging end in a co-optical-axis mode. The coaxial type super remote distance fold-back low-light ranging night vision big camera lens provides multiple refraction and reflection for a light path so that the light path is effectively folded, effectively reduces focal ratio under the condition that the length of the camera lens system is not increased and fewer lens groups are used; meanwhile, provides the laser emission lens and the laser receiving lens for ranging, provides a ranging function besides observation, achieves the effect that the ranging directivity and the observation are coaxial, combines night vision and the ranging function into one machine, and is low in costs and convenient to carry.

Description

technical field [0001] The invention relates to the field of imaging devices, in particular to a large coaxial ultra-long-distance turn-back low-light ranging night vision lens. Background technique [0002] Existing night vision technology includes two aspects of infrared night vision and low-light night vision. Infrared night vision technology is divided into active infrared night vision technology and passive infrared night vision technology. Active infrared night vision technology is a night vision technology that implements observation by actively illuminating and using the infrared light reflected by the target to reflect the infrared source. The corresponding equipment is active infrared night vision technology. Passive infrared night vision technology is an infrared technology that realizes observation by means of infrared radiation emitted by the target itself. It finds the target according to the temperature difference or thermal radiation difference between the t...

AI Technical Summary

Problems solved by technology

Thermal imagers have unique advantages that are different from other night vision devices, such as being able to work in foggy, rainy or snowy weather conditions, having a long range, and anti-jamming effects that can identify camouflage, but their cost is very high

[0003] If you need to use the ranging function while using the night vision device, you need to use the rangefinder; the cost of using these two instruments at the same time is high and brings a lot of inconvenience to the use

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