A double-l rotating three-field long-wave infrared system
A long-wave infrared, rotating technology, applied in the optical field, can solve the problems of low transmittance of the optical system, low accuracy of the optical axis and field of view, etc., to reduce the volume of the system, easy to ensure the optical axis, and high accuracy of the optical axis Effect
Active Publication Date: 2021-10-22
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology
The disadvantage is that due to the way of axial movement, all optical elements are shared by three fields of view, resulting in low transmittance of the entire optical system, and low positioning accuracy of the optical axis and field of view
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[0023] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0024] Such as figure 1 Shown is the optical path diagram of the infrared optical system of the present invention, with the narrow field of view optical path composed of large objective lens 1, focusing mirror 2, first reflector 3, field lens 4, second reflector 5, and converging lens group 6 as Basic light path. The middle field of view mirror group is composed of the first middle field of view zoom mirror 7 and the second middle field of view zoom mirror 8. The motor drives the middle field of view mirror group to rotate clockwise to enter the narrow field of view optical path. The first middle field of view zoom mirror 7 is located in the front group Between the infrared objective lens and the focusing lens group, the second medium field of view variable magnification mirror 8 is positioned between the first reflector 3 and the field lens 4, and the optical a...
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The invention relates to a double-L rotating three-field long-wave infrared system, in which a narrow field of view light path is formed by a large objective lens, a focusing mirror, a first reflector, a field mirror, a second reflector, and a converging lens group; the middle field of view is inserted lens group and make the optical axis of the medium field of view lens group coincide with the optical axis of the narrow field of view to obtain the medium field of view optical path; replace the medium field of view lens group with the large field of view lens group and make the optical axis of the large field of view lens group coincide with the optical axis of the narrow field of view The optical axes coincide to obtain a large field of view optical path. The coaxial double L rotation method is used to realize the conversion of three fields of view, which significantly reduces the weight and volume of the system. The narrow field of view is used for long-distance target recognition; the medium field of view is used for target detection; the large field of view is used for day and night auxiliary navigation and take-off and landing. The optical path of the narrow field of view has no moving parts, and the optical-mechanical adjustment can ensure that the optical axis of the narrow field of view reaches high precision. At the same time, the wide and medium fields of view are converted by axial zoom, and the optical axis is easy to ensure.
Description
technical field [0001] The invention belongs to the field of optical technology, and relates to a double-L rotating three-field long-wave infrared system. Background technique [0002] The implementation methods of the infrared three-field zoom optical system at home and abroad are divided into radial cut-in method, double-rotation method, and axial movement method. The advantage of the radial cut-in and double-rotation three-field optical system is that the narrow field of view has the highest optical axis accuracy and the highest optical transmittance. The disadvantage is that the radial size of the system is too large and the movement mechanism is too large due to the radial switching method. Complicated and heavy. The axial movement mode three-field optical system realizes the conversion of the three-field of view through the different positions of the zoom lens group and the compensation lens group on the optical axis. The advantage of this method is that the system is...
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IPC IPC(8): G02B15/14
CPCG02B15/14
Inventor 赵菲菲梁瑞冰赵延
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC