F20 mm portable mechanical passive athermal infrared prime lens and using method thereof

Abstract

The invention relates to an f20 mm portable mechanical passive athermal infrared prime lens. The f20 mm portable mechanical passive athermal infrared prime lens comprises an outer cover and an optical system, wherein the optical system is arranged in the outer cover; a positive optical focus lens A, a negative optical focus lens B and a positive optical focus lens C are successively arranged in the optical system in the incident direction of light rays from left to right; the rear end of the inside of the outer cover is in screwed connection with a rear lens cone; a front lens cone is arranged at the front end of the inside of the outer cover; the positive optical focus lens A is mounted in the front lens cone; the front end of the positive optical focus lens A is fixed on a front pressing ring on the front lens cone in a screwed connection manner; the negative optical focus lens B and the positive optical focus lens C are mounted in the rear lens cone; a BC spacer ring is arranged between the negative optical focus lens B and the positive optical focus lens C; the rear end of the positive optical focus lens C is fixed on a rear pressing ring on the rear lens cone in a screwed connection manner; a circular positioning boss of which the outer diameter is greater than the front lens cone is arranged on the rear end surface of the front lens cone; a spring plate is arranged between the circular positioning boss and the rear lens cone; a front baffle ring which is in screwed connection to the outer cover is arranged on the periphery of the front end of the front lens cone; and a retractable ring is arranged between the front baffle ring and the circular positioning boss. The f20 mm portable mechanical passive athermal infrared prime lens is simple in structure.

Description

technical field [0001] The invention relates to a f20mm portable mechanical passive athermal infrared fixed-focus lens and a using method thereof, belonging to the lens field. Background technique [0002] With the continuous development and maturity of uncooled detector technology, long-wave infrared uncooled optical systems have been widely used in military and civilian fields, because infrared lenses have good anti-interference performance; Strong fog and haze ability; can work all-weather and all-day; has the advantages of multi-target panoramic observation, tracking and target recognition capabilities, and good anti-invisibility capabilities, so the imaging quality of the optical system is increasingly demanding . However, due to the thermal effect of infrared optical materials and mechanical materials, drastic changes in operating temperature will have a serious impact on the optical system, such as causing focal length changes, image plane drift, and image quality de...

AI Technical Summary

Problems solved by technology

However, most of the lenses on the market have complex structures, high processing difficulty and high cost, poor fo

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