Panoramic imaging lens free of central blind area

Abstract

The invention provides a panoramic imaging lens free of a central blind area. The panoramic imaging lens comprises, from the side of an object along the direction of optical axis, an adjusting lens (22), a semi-transparent semi-reflective lens (23) and a concave reflector (24). A round hole (241) is formed in the center of the concave reflector (24). The optical axis serves a rotation symmetry axis for the adjusting lens (22), the semi-transparent semi-reflective lens (23) and the concave reflector (24). The adjusting lens (22) is used for converging light rays emitted by objects in an original central blind area; the concave reflector (24) is used for reflecting light rays emitted by objects outside the original central blind area to the semi-transparent semi-reflective lens (23); the semi-transparent semi-reflective lens (23) is used for transmitting incident rays from the adjusting lens (22), enabling the incident rays to pass through the round hole (241) of the concave reflector (24), reflecting reflection rays from the concave reflector (24), and enabling the reflection rays to pass through the round hole (241) of the concave reflector (24), so that imaging of the light rays from the adjusting lens (22) and the light rays from the concave reflector (24) is achieved on a focal plane.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a panoramic imaging lens without a central blind spot. Background technique [0002] The optical field of view of the panoramic ring optical lens can be considered to be composed of optical fields in two directions. In the Cartesian polar coordinate system, the optical field of view in one direction is located in the XOY plane, that is, the field of view in the azimuth direction is 360°; the size of the optical field in the other direction is the difference in pitch angle of the system. Such an annular optical lens can image a scene in a 360° annular field of view in the XOY plane to achieve a special panoramic imaging effect. [0003] At present, there are many forms of panoramic ring lenses, mainly including refraction and reflection. The reflective panoramic ring lens includes two reflective panoramic lenses. figure 1 It is a schematic diagram showing the main struct...

AI Technical Summary

Problems solved by technology

This central blind spot not only affects the integrity and beauty of imaging, but also greatly reduces the safety in practical application fields such as security and surveillance.

Images