A Long Focal Length Front Telescope System
A front telescopic system and long focal length technology, applied in the field of space optical remote sensing, can solve the problems affecting the normal operation of the focusing mechanism, and achieve the effects of avoiding heat transfer, improving stability, and simple structure
Active Publication Date: 2018-11-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology
Traditional focusing methods generally use cams, screw nuts, and worm gears. The common feature of these focusing methods is that they all need a stepping motor as a driving component. Once the motor has a problem, it will affect the normal operation of the focusing mechanism. Work
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[0036] In order to solve the problem that the whole focusing mechanism cannot work normally due to the problem of the stepping motor in the mechanical focusing structure of the traditional front telescopic system, the present invention proposes a long focal length front telescopic system.
[0037] like figure 1 As shown, the system includes a primary mirror assembly 1, a secondary mirror assembly 2, a connecting barrel 3 (4J32 material) connecting the two assemblies, a primary and secondary mirror trimming pad 4 installed at the connection point between the secondary mirror assembly 2 and the connecting barrel 3, and A focusing mechanism for adjusting the distance between the primary mirror 5 in the primary mirror assembly 1 and the secondary mirror 6 in the secondary mirror assembly 2.
[0038] Wherein, compared with the traditional system, the main mirror assembly 1 and the connecting tube 3 of the present invention are the same as the traditional telescopic system; the seco...
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The present invention relates to a long-focus front telescope system. The system comprises a primary mirror assembly, a secondary mirror assembly, a connection cylinder connecting the primary mirror assembly with the secondary mirror assembly, primary and secondary mirror cropping pads installed at the secondary mirror assembly and at the connection point of connecting with the connection cylinder and a focusing mechanism. The secondary mirror assembly includes a secondary mirror cylinder, a secondary mirror installed in the secondary mirror cylinder and a secondary mirror frame installed between the secondary mirror cylinder and the connection cylinder; one end, facing the primary mirror assembly, of the secondary mirror cylinder is provided with a secondary lens hood; the focusing mechanism includes a heating piece, a focusing space ring, a spring washer and a big nut; the big nut is installed at one end, far away from the primary mirror assembly, of the secondary mirror cylinder through the spring washer, and the heating piece is attached on the big nut; the spring washer generates deformation displacement under the external force compression; and the focusing space ring is installed between the secondary mirror cylinder and the secondary mirror frame; and the focusing space ring generates expansive deformation after heating. The long-focus front telescope system performs focusing work of the telescope system through adoption of the temperature control mode formed by allowing the heating piece to match the spring washer and the focusing space ring, and the structure is simple, the weight is light, the cost is low and the reliability is high.
Description
technical field [0001] The invention belongs to the technical field of space optical remote sensing, and in particular relates to a long focal length front telescopic system. Background technique [0002] As the spatial resolution becomes higher and higher, the focal length of the front telephoto system is getting longer and longer, and the requirements for the position of the image plane are also getting higher and higher. When environmental factors such as mechanical or temperature changes cause the position of the image plane and The relative movement between the positions of the detectors will decrease the transfer function of the entire system, resulting in a decrease in the image quality of the system. Therefore, a focusing mechanism must be introduced to compensate for the defocusing amount of the optical system. [0003] For an imaging system, focusing can be achieved by moving the position of the detector or adding a focusing lens group to change the focal length. ...
Claims
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IPC IPC(8): G02B23/00G02B7/04G02B7/02
CPCG02B7/022G02B7/026G02B7/04G02B23/00
Inventor 孙剑李立英胡炳樑白清兰冯玉涛武俊强
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI