Reflection-type afocal optical system

Abstract

The invention discloses a reflective afocal optical system which comprises a primary mirror, a secondary mirror, a third mirror, a plane mirror A and a plane mirror B. The focal power of the primary mirror, the focal power of the secondary mirror and the focal power of the third mirror are not zero, and the primary mirror, the secondary mirror and the third mirror are arranged on the same optical axis to form a common optical axis A; a through hole is formed in the middle of the primary mirror; the secondary mirror receives the light beam reflected by the primary mirror, reflects the light reflected by the primary mirror again and emits the light from the primary mirror through hole; the third mirror receives the light beam reflected by the secondary mirror; the plane mirror A receives the light beam reflected by the third mirror and reflects and steers the light beam, and a middle through hole A through which the light beam reflected by the secondary mirror passes is formed in the middle of the plane mirror A; the plane mirror B receives the light beam reflected by the plane mirror A and reflects and steers the light beam to form an optical axis B after steering, and the optical axis B is perpendicular to the optical axis A; according to the invention, the volume of the whole system is compressed, and image stabilizing elements can be arranged more easily.

Description

technical field [0001] The invention relates to the field of optics, in particular to a reflective afocal optical system. Background technique [0002] In order to obtain more information, distinguish more details, and collect more energy, modern photoelectric sighting equipment continues to expand in the direction of multi-band, long focal length, and large aperture. On this basis, improving multi-spectral integration and product stability accuracy is also an important development trend. In principle, the more optical paths shared by multiple spectral segments, the higher the integration and coaxial stability. For airborne photoelectric sighting equipment, in addition to the above characteristics, the size and weight of the system are as important as performance indicators. For long focal length systems, optical axis control measures are also required to solve the problems caused by platform movement or vibration. image instability problem. [0003] The reflective design...

AI Technical Summary

Problems solved by technology

If this design is used for airborne sighting, it shows two shortcomings. First, it is difficult to use a plane mirror as an image stabilization element, because the incident angle of the beam is large, and it is only suitable for image stabilization in one direction; Second, the primary image is far to the right of the primary mirror, making the system relatively large

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