Large field of view distortion-free rearview mirror

Abstract

The invention discloses a design method for a large-view non-distortion rearview mirror. The method includes the steps that initial design parameters are input and set; based on a light ray reflection basic principle, a system of partial differential equations is established; according to the initial design parameters, image points and coordinate algebraic expressions of object point coordinates, the system of partial differential equations is solved through a step-by-step integration method and according to an appointed integral path, and height values of all discrete points on a mirror face of the designed rearview mirror are obtained; after deviation of the height values of all the discrete points on an xy plane is eliminated, rotary and symmetric polynomial fitting is conducted; and an equation of the face shape of the smooth and continuous large-view rearview mirror is obtained, and data required for machining of a numerical control machine tool are generated. The requirements for image non-distortion, the large view and the distance reality sense can be met at the same time, the rearview mirror which has the reasonable view amplification multiplying power and accords with the habits of a driver can be designed, and the rearview mirror can be used as any of outer rearview mirrors and inner rearview mirrors on the left side and the right side of various types of vehicles and can adapt to various appearances and sizes.

Description

technical field [0001] The invention relates to a vehicle rearview mirror design technology, in particular to a design method for a large field of view distortion-free rearview mirror. Background technique [0002] The vehicle rearview mirror is an important vehicle active safety device, and it is a tool for the driver to directly obtain external information while sitting in the cab seat. If the rearview mirror has blind spots and image distortion, it will cause collisions, bumps into people, etc. when changing lanes, turning, or reversing, which will bring serious hidden dangers to safe driving. [0003] At present, vehicle rearview mirrors mainly include plane mirrors, spherical mirrors, combined mirrors, hyperbolic mirrors and gradient curved mirrors, etc. These rearview mirrors have the following problems: (1) The advantages of plane mirrors are that the image has no distortion and the sense of distance is real. The disadvantage is that the field of view is insufficient...

AI Technical Summary

Problems solved by technology

If the rearview mirror has blind spots and image distortion, it will cause collisions, collisions, etc. when changing lanes, turning, or reversing, which will bring serious hidden dangers to safe driving.

[0003]At present, vehicle rearview mirrors mainly include flat mirrors, spherical mirrors, combined mirrors, hyperboloid mirrors and gradient curved mirrors, etc. These rearview mirrors have the following problems: (1) The advantage of the plane mirror is that the image has no distortion and the sense of distance is real. The disadvantage is that the field of vision is insufficient and there are blind spots, which bring hidden dangers to safe driving.

(2) The use of a spherical mirror with a small curvature can expand the field of vision, but the image distortion is serious, making it difficult for the driver to correctly judge the real situation behind the side

(3) A combined mirror composed of multiple different mirrors has the advantage of eliminating blind spots to a certain extent, but its respective imaging, image segmentation, and fracture, and its complex structure and messy installation make it impossible for the driver to observe simultaneously at the same time Multiple mirrors can easily cause misjudgment and lead to car accidents

Its characteristic is that the radius of curvature becomes smaller and smaller from top to bottom, the radius of curvature of the upper half of the mirror surface is larger, and the radius of curvature of the lower half of the mirror surface not only becomes smaller from top to bottom, but also becomes smaller and smaller from one side to the other. Small, this kind of rearview mirror has the advantage of large field of view, but the disadvantage is that the sense of distance is very poor, and the change of imaging is irregular

[0004]With the rapid development of the automobile industry, people at home and abroad are constantly studying the blind area of ​​vehicle rearview mirrors, and put forward some new design methods for rearview mirrors. Using these methods to design Although the rearview mirror has a large field of view, it has a poor sense of reality for the speed and distance of the rearview target, and the vertical and horizontal ratios of some rearview mirror imaging are out of balance, which affects the driver's judgment on the target, and will also cause safety hazards

To sum up, the existing design methods of rearview mirrors are difficult to meet the requirements of no image distortion, large field of view and distance realism at the same time.

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