Multi-curvature rear view mirror lens

Abstract

The invention discloses a multi-curvature rear view mirror lens, pertaining to the technical field of auto parts. A mirror surface of the lens is a multi-curvature free curved surface combined by multiple small mirror surfaces. Curvature radii are different among the multiple small mirror surfaces and different directions of each small mirror surface. The curvature radius of an overall mirror surface firstly decreases and then increases from the top to the bottom. So does the change rate of the curvature radius. The curvature radius of the overall mirror surface firstly decreases and then increases from the left to the right. So does the change rate of the curvature radius. The multi-curvature rear view mirror lens has following beneficial effects: the curvature radius of the overall mirror surface of the multi-curvature rear view mirror lens keeps changing so that each small mirror covers a small area in the approximation to a point; a smooth surface is achieved after splicing of the multiple small mirror surfaces; uniform imaging is obtained by mirror surfaces without hopping so that no interference is caused to riding of a driver and a field range is broad and image distortion is less; and the multi-curvature rear view mirror lens is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a multi-curvature rearview mirror lens. Background technique [0002] The car rearview mirrors of general models are flat mirrors or single-curvature convex mirrors, which generally have the problem of insufficient field of view, or blind spots, or image distortion, so the driver cannot accurately judge the position of obstacles and the body and obstacles. The distance will seriously affect driving safety. According to statistics, about 30% of traffic accidents are caused in China due to blind spots of rearview mirrors. Therefore, how to design a rearview mirror with a large field of view, a small blind spot, and low image distortion is an important research topic at present. [0003] As an important part of a car, the rearview mirror has launched many products with different functions and appearances on the market in recent years. The imaging effect of the rearview mirror ...

AI Technical Summary

Problems solved by technology

The imaging effect of the rearview mirror is related to the radius of curvature of the mirror surface. The larger the radius of curvature, the smaller the image distortion, but the smaller the field of view; on the contrary, the larger the radius of curvature, the larger the field of view, but the image distortion will also be larger. serious

According to the difference in the shape of the mirror surface, the existing rearview mirrors can be roughly divided into the following categories: the first category is a flat mirror, whose radius of curvature is infinite, and the image is not distorted, but the field of view is small, and it is easy to produce a large blind area, which gives Driving brings a lot of inconvenience; the second type is a single curved mirror, and its mirror shape is a convex mirror with a single curvature, which reduces the radius of curvature of the flat mirror mirror surface, and its essence is to expand the field of vision at the cost of image distortion; the third type is a double curved mirror. curved mirror

Most of the double-curvature rearview mirrors on the market are realized by adding a convex small round mirror to the flat mirror. Although it solves the contradiction between image distortion and field of view to a certain extent, it needs the driver to observe different curvatures on the mirror. The high-degree area brings inconvenience to driving and judgment. At the same time, the design of the two mirrors greatly increases the cost and is not beautiful in appearance.

The fourth category is polycurvature mirror, its essence is that the inner 3 / 4 range of the mirror surface is flat, and the outer 1 / 4 range is a curved surface with gradual curvature. Its effect is roughly the same as that of a hyperbolic mirror. In the face, there is still the problem of inconvenient observation, and it also increases the difficulty for the driver to judge the distance between the vehicle body and the obstacle

Therefore, for the entire rearview mirror group, although the truck rearview mirror has almost zero blind spots through the use of multiple mirrors to complement each other, the imaging distortion is very serious, and the driver will have a serious sense of dizziness when observing, which increases the risk of driving.

[0005] As can be seen from the above, many methods have been proposed for the improvement of car rearview mirrors, but there are very few improvements for large truck rearview mirrors.

In actual conditions, truck drivers mostly drive at night or in suburbs and mountainous areas with poor road conditions, which increases the risk of driving, so it is very important to propose an improvement to truck rearview mirrors.

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