Infrared continuous zooming optical system based on composite zooming and having super-large zoom ratio

Abstract

The invention discloses an infrared continuous zooming optical system based on composite zooming and having an ultra-large zoom ratio. The infrared continuous zooming optical system sequentially comprises a continuous zooming group and a secondary zooming group from an object space to an image space along an optical axis direction; the continuous zooming group sequentially comprises a main objective lens group, a secondary objective lens group, a primary zooming group, a compensation group and a fixed group from an object side to an image side along the optical axis direction; the secondary zooming group sequentially comprises a first rear group lens, a second rear group lens and a third rear group lens from the object side to the image side along the optical axis direction; when the primary zooming group is farthest from the compensation group, the optical system is in a short focus state; when the primary zooming group is closest to the compensation group, the optical system is in along focus state; the light beam from the object side is converged between the fixed group and the first rear group lens through the continuous zooming group; and the first rear group lens, the secondrear group lens and the third rear group lens are used for finally imaging an image formed by the continuous zooming group on the target surface of the detector. The ultra-large zoom ratio continuouszooming compact miniaturization design is adopted, the system image quality is good, and the imaging is clear.

Description

technical field [0001] The invention relates to the field of optics, in particular to an infrared continuous zoom optical system based on a compound zoom super large zoom ratio. Background technique [0002] In recent years, infrared thermal imaging technology has developed rapidly. Due to its many excellent features, such as passive reception of infrared radiation, high concealment, and no electronic interference by the enemy; high precision; easy-to-observe images, it is widely used in military, vehicle, Temperature measurement, power line inspection, border security and other fields have been widely used, especially in the military field. The infrared optical system is an important part of the infrared thermal imager by collecting the external infrared radiation and finally focusing it on the target surface of the detector. Infrared optical systems can be roughly divided into fixed focus, two-speed, multi-speed and continuous zoom. The continuous zoom optical system can...

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Problems solved by technology

[0004] Aiming at the design of the super-large zoom ratio continuous zoom optical system in the prior art, if the traditional continuous zoom design method is adopted, problems such as large lens size and low optical

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