Wide-angle optical lens

Abstract

The invention discloses a wide-angle optical lens, which comprises a first lens, a second lens and a third lens from an object side to an image side. A diaphragm is arranged between the second lens and the third lens; the first lens is a negative focal power lens; the second lens and the third lens are positive focal power lenses; the second lens and the third lens are meniscus lenses, the convex surfaces of which face to the image side; and the first lens is a meniscus lens, the convex surface of which faces to the object side, or the first lens is a biconcave lens, or the first lens is a planoconcave lens, the concave surface of which faces to the image side. The focal power of the second lens and the focal power of the third lens meet the conditions in the specification simultaneously; offset can be controlled within + / -0.01 in a temperature range of -50 DEG C-90 DEG C, and focal power offset due to heat expansion and cold contraction of each part of the lens can be compensated well, so that the lens is allowed to realize clear imaging within a range of -50 DEG C-90 DEG C, and the viewing angle is wide; and the adopted lenses are few, and thus the size of the lens can be effectively reduced.

Description

technical field [0001] The invention relates to an imaging component, in particular to an optical lens with a wide viewing angle range. Background technique [0002] In recent years, with the continuous development of car video, people are more and more convenient when reversing, but people prefer the car camera to have a wider viewing angle, and require the camera to be smaller and smaller, so the size of the lens is also smaller. Therefore, the lens structure is required to be more and more simple, and the internal lenses should not be too many. At the same time, the lens needs to have better tolerance to environmental changes, especially temperature changes, because the camera itself is working Heat dissipation is required, and some cameras are equipped with laser lights, and laser lights need to release a lot of heat when they work, causing the temperature of the lens to rise rapidly, and the image quality of the traditional lens barrel will be affected as the temperatur...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous development of car video, people are more and more convenient when reversing, but people prefer the car camera to have a wider viewing angle, and require the camera to be smaller and smaller, so the size of the lens is also smaller. Therefore, the lens structure is required to be more and more simple, and the internal lenses should not be too many. At the same time, the lens needs to have better tolerance to environmental changes, especially temperature changes, because the camera itself is working Heat dissipation is required, and some cameras are equipped with laser lights, and laser lights need to release a lot of heat when they are working, causing the temperature of the lens to rise rapidly, and the image quality of the traditional lens barrel will be affected as the temperature changes

At present, there are many patent documents on wide-angle lenses. The current application number is 201410558001.8. The Chinese invention application "Wide-angle Lens" discloses a lens that can image clearly in the range of -40°C~85°C. The offset is ±0.02mm, but its The design of the lens barrel is relatively complicated, and there are many lenses, which virtually increases the length of the lens barrel, and secondly increases the cost of the lens

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