Optical lens module applied to sweeping robot

Abstract

The invention discloses an optical lens module applied to a sweeping robot, which comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side, a diaphragm is arranged between the second lens and the third lens, the first lens comprises a first surface close to the object side and a second surface away from the object side, and the fourth lens comprises a second surface close to the object side and a third surface away from the object side. The surface type structures of the first surface and the second surface meet an equation I, Cy represents the curvature in the Y direction, Cx (y) represents the curvature in the X direction, Ky represents the cone coefficient in the Y direction, X and Y represent the distance between the x direction and the y direction, Z (x, y) represents the coordinate in the z direction, and an, bn, cn... jn, An, Bn... Fn are coefficients; the focal power of the first lens is negative. The two surface types of the first lens have corresponding curvature changes in the X direction and the Y direction, the view field change rates of the edges of the lens in the X direction and the Y direction can be basically the same, image edge distortion is reduced, and meanwhile it can be guaranteed that the transverse large view field angle is achieved.

Description

technical field [0001] The invention relates to the technical field of optical lens modules, in particular to an optical lens module applied to sweeping robots. Background technique [0002] In the application field of sweeping robots, it is required that the optical lens module can achieve different magnification ratios for the horizontal field of view and the vertical field of view, and the horizontal field of view should be as large as possible, while ensuring relatively high imaging quality. However, the existing designs of optical lens modules on the market generally have relatively large distortion at the edge of the image. For example, reference document 1 (application number 202021247233.9) discloses an additional anamorphic lens for a mobile phone, which utilizes a cylindrical mirror (flat Concave cylindrical lens and flat convex cylindrical lens) achieve 1.55 times magnification of the horizontal field of view, and finally achieve a horizontal and vertical field of...

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Problems solved by technology

However, the existing designs of optical lens modules on the market generally have relatively large distortion at the edge of the image. For example, reference document 1 (application number 202021247233.9) discloses an additional anamorphic lens for a mobile phone, which utilizes a cylindrical mirror (flat Concave cylindrical lens and flat convex cylindrical lens) achieve 1.55 times magnification of the horizontal field of view, and finally achieve a horizontal and vertical field of view angle of 2.75:1, but due to the surface shape of the cylindrical mirror, it is not possible to realize the XY two directions of the edge of the lens The rate of change of field of view is basically the same, so the imaging quality at the edge of the image cannot be guaranteed

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