A Large Aperture Infrared Confocal Monitoring Lens

Abstract

The invention discloses a heavy-caliber infrared confocal monitoring lens, and relates to the technical field of monitoring as well as security and protection. The heavy-caliber infrared confocal monitoring lens is characterized in that a first double-concave lens element is arranged on one side of an objective image, and a second double-concave lens element is arranged on the rear of the first double-concave lens element; a third lens element, a fourth lens element and a fifth crescent lens element are successively arranged between the second double-concave lens element and a sixth double-concave lens element, and the third lens element and the fourth lens element are connected through a gluing manner. The heavy-caliber infrared confocal monitoring lens provided by the invention has the advantages that the structure is simple, the fabricating cost is low, the monitoring is successfully realized, the distortion is small, the relative aperture is large, the infrared confocal property is achieved, the super high vision and the large peripheral light-bright ratio are achieved, a perfect imaging resolution is kept in the environment with a large range of temperature, and thus the heavy-caliber infrared confocal monitoring lens is widely applied to outdoor monitoring, community security and protection systems and the like.

Description

technical field [0001] The invention relates to the technical fields of monitoring and security, in particular to a large-diameter infrared confocal monitoring lens. Background technique [0002] In recent years, with the rapid development of my country's economy, people increasingly need high-quality life and a safe and reliable living environment. Major projects are being carried out across the country, and the nighttime application of monitoring systems is becoming more and more frequent. This infrared confocal monitoring security lens came into being. At present, the monitoring lens is generally composed of 6 to 8 lenses, such as the wide-angle lens of Chinese Patent No. 200910099703, which uses 4 spherical lenses and 2 aspherical lenses, because the processing of aspheric surfaces requires higher requirements and the chemical stability of the material Poor performance, which will invisibly increase the processing cost, make the market price generally high, and cannot me...

AI Technical Summary

Problems solved by technology

At present, the monitoring lens is generally composed of 6 to 8 lenses, such as the wide-angle lens of Chinese Patent No. 200910099703, which uses 4 spherical lenses and 2 aspherical lenses, because the processing of aspheric surfaces requires higher requirements and the chemical stability of the material Poor performance, which will invisibly increase the processing cost, make the market price generally high, and cannot meet the customer's demand for low-end market products

Moreover, in order to meet the needs of large field of view and small aberration, the general surveillance lens even uses 7 to 9 spherical lenses, which not only increases the cost, but also increases the volume and weight of the entire product. Miniaturization and miniaturization are contrary to the purpose of