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

A fixed-focus lens and mechanical technology, applied in the field of lenses, can solve the problems of high processing difficulty and cost, difficult to distinguish the shape of things, long lens structure, etc., and achieve the effect of ensuring sealing performance, simple and compact structure, and low production cost.

CN106443942AInactive Publication Date: 2017-02-22FUJIAN FUGUANG TIANTONG OPTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-22
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Such as Figure 1~2 As shown, a f20mm portable mechanical passive athermalized infrared fixed-focus lens includes a housing 1 and an optical system arranged in the housing. The optical system of the lens is sequentially provided with a positive focal Lens A, negative optical focus lens B and positive optical focus lens C, the inner rear end of the outer cover is screwed with a rear lens barrel 17, the inner front end of the outer cover is provided with a front lens barrel 2, and the positive optical focus lens A is installed on In the front lens barrel, the front end of the positive optical focus lens A is fixed through the front pressure ring 3 screwed on the front lens barrel, and the negative optical focus lens B and the positive optical focus lens C are installed in the rear lens barrel. A BC spacer 4 is provided between the negativ...