Novel optical path deflection camera lens

Abstract

The invention relates to a novel optical path deflection camera lens which can achieve instant imaging, and also can realize path deflection and meet the requirements on wide angle, large aperture and high-resolution imaging quality. The aims of the invention are achieved by the following technical scheme: the novel optical path deflection camera lens comprises a front group of lenses M, a reflector, a fourth lens and a rear group of lenses N in sequence from an object side to an image side, wherein the fourth lens is a relay lens R with positive focal power for close-range imaging. The novel optical path deflection camera lens has the advantages that by adopting a new scheme of additionally arranging the relay lens with positive focal power for close-range imaging between a front group of wide-angle negative long-range lenses and a rear group of wide-angle negative long-range lenses, the novel optical path deflection camera lens widens an air gap between lenses by using an optical structure with instant imaging, satisfies the space required for optical path deflection, and shortens the optical length along the axial direction.

Description

technical field [0001] The invention relates to a novel optical path deflection camera lens. Background technique [0002] Most of the existing video surveillance systems can be installed in a large space, so there is no need to shorten the total length along the optical axis, so that the matching requirements of large aperture, wide-angle high-definition and long rear working distance can be easily realized, and the structure is also Simple. However, in some special occasions (such as being limited by the thickness of the installation wall), the camera can only be installed perpendicular to the optical axis or at other angles. Because the focal length of the wide-angle video surveillance camera lens is relatively short, it is relatively difficult to realize the deflection of the optical path by making the back focus very long (such as the back focus is 4 to 5 times of the focal length). The usual solution is to use a wide-angle front objective lens connected to the field ...

AI Technical Summary

Problems solved by technology

However, due to the large axial aperture angle borne by the relay lens and the poor correction of the spherical aberration of the diaphragm, this solution is difficult to apply to camera systems with large apertures and high resolution requirements.

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