a wide angle lens

Abstract

The invention provides a wide-angle lens. The wide-angle lens comprises a front set and a rear set in sequence in the light incidence direction. The front set comprises a first negative lens and a second positive lens. The rear set comprises a similar bonding lens set including a third positive lens and a fourth negative lens. Specifically, the first negative lens is provided with a first surface protruding towards an object space and a second surface concaved towards an image space and is located at the starting end of the lens. The second positive lens is provided with a third surface concaved towards the object space and a fourth surface protruding towards the image space. The third positive lens is provided with a fifth surface protruding towards the object space and a sixth surface protruding towards the image space. The fourth negative lens is provided with a seventh surface concaved towards the object space and an eighth surface concaved towards the image space. According to reasonable arrangement of all the elements, the thicknesses of the lenses are equal to the air interval thickness, the lenses are easy to process and form in shape, the requirement for eliminating distortion at a large field angle is met, and meanwhile the quality of high-temperature and low-temperature imaging is optimized and corrected; besides, the cost is low, the structure is simple and miniaturization is achieved.

Description

technical field [0001] The invention relates to the technical field of optical lens design, in particular to a wide-angle lens. Background technique [0002] With the advancement of technology, consumer electronics products have higher and higher requirements for the application of wide-angle lenses, especially in various environments: such as snowy mountains, high temperature and other harsh environments, the expectations for lens performance are higher. It will cause a large back focus shift to the general plastic lens, which will affect the quality of the imaging, serious imaging blur, unstable system parameters, resulting in failure modes such as the lens not working properly. [0003] The main method commonly used at present to eliminate thermal offset is to use a large number of glass materials. Since the refractive index of glass materials changes little with temperature, it can well eliminate the influence of temperature on the focal length of the system. However, th...

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Problems solved by technology

[0002] With the advancement of technology, consumer electronics products have higher and higher requirements for the application of wide-angle lenses, especially in various environments: such as snowy mountains, high temperature and other harsh environments, the expectations for lens performance are higher. It will cause a large back focus shift to the lens of general plastic structure, which will affect the quality of imaging, and seriously cause blurred imaging, unstable system parameters, and failure modes such as the lens not working properly.

[0003] The main method commonly used at present to eliminate thermal offset is to use a large number of glass materials. Since the refractive index of glass materials changes little with temperature, it can well eliminate the influence of temperature on the focal length of the system. However, the use of glass materials in mass production First, the cost of wide-angle lens is relatively high, and second, it is difficult to correct the distortion to the ideal range. If glass aspheric surface is used, the cost and production capacity will greatly restrict the versatility and wide-range application of the product.

[0004] How to avoid the thermal offset caused by the use of plastic lenses and the high cost and difficult to correct distortion caused by the use of glass lenses has become a difficult problem to be overcome

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