Shaped lens design method

Abstract

The invention provides a method for designing a special lens of a rearview mirror of an automobile. The method comprises the following steps of: a, using a plane mirror as a designed initial prototype lens; b, designing a special lens outline and an installing position according to a use environment, testing and regulating the design by using the prototype lens; c, based on the outline and position design, referencing an image of the prototype lens to relevant regions behind the automobile for dividing visual regions; d, dividing based on the outline, the position and the visual regions, calculating and testing a curvature and an inclination of each visual region and making a new prototype lens according to the curvature and inclination of each visual region; and e, ending the design when the new prototype lens reaches the design requirement of the prototype lens, and otherwise, returning to the step b for regulating the design. According to the method for designing the special lens, provided by the invention, a plurality of visual regions can be formed on one lens through changes of the positions, the size, the curvature and the inclination, so that a plurality of blind regions of the single-curvature lens can be eliminated, the view field of a driver is effectively enlarged; and meanwhile, due to smooth connection among the visual regions, images in all visual regions are naturally continuous, jump, excursion and boundary of the images among the visual regions on a mirror surface are avoided causing illusion to a driver.

Description

technical field [0001] The invention relates to a lens design method of an exterior rearview mirror of an automobile, in particular to a design method of a special-shaped lens with multiple visual zones and natural continuous mirror images. Background technique [0002] Automobiles have become an important means of transportation and transportation in human society. In the process of driving a car, the driver needs to observe the side and rear conditions of the car through the car rearview mirror. [0003] The existing rearview mirror lens design method is simple, the designed lens adopts a single curvature, and there are many blind spots. When the driver changes lanes or turns, it is difficult to observe the vehicle coming from the side, and it is difficult to observe the under-wheel and the wheel when driving. Surrounding conditions, it is difficult to observe the rear of the car and the obstacles above and below the rear when reversing, and it is difficult to observe the...

AI Technical Summary

Problems solved by technology

Since the ordinary rearview mirror has a single curvature, the field of view is limited, and it is mainly used to observe the side and rear of the car, and cannot see the car coming from the front side, obstacles at the rear of the car, front and rear wheels, and the cut road surface

Images