Optical lens assembly

Abstract

The invention relates to the field of optics and provides an optical lens assembly. The optical lens assembly comprises a first lens and a second lens which are coaxial and are arranged from an object side to an image side in turn, and a fixed diaphragm which is positioned on the rear of the second lens, wherein the first lens is provided with a first convex and aspherical surface which faces theobject side and a second concave and aspherical surface which faces the image side; and the second lens is provided with a third convex and aspherical surface which faces the object side and a fourthconvex and aspherical surface which faces the image side. The optical lens assembly meets the following conditions that: L / f is more than 3.3, f1 is less than 0 and f2 is more than 0, wherein f is aneffective focal distance value of the whole optical lens assembly; L is the total length of an optical system; f1 is an effective focal distance value of the first lens and f2 is an effective focal distance value of the second lens. The optical lens assembly is provided with only two lenses with negative and positive diopters, can collect more edge rays as possible, effectively improves the imagesurface brightness, reduces an emergence angle of a principal ray of the system and well corrects the off-axis aberration.

Description

Technical field [0001] The invention relates to an optical device, in particular to an optical lens assembly. Background technique [0002] In the digital imaging equipment, the optical imaging lens is a particularly important component, and the image quality of the lens directly determines the imaging performance of the digital imaging equipment. Existing optical imaging lens products tend to focus on excellent imaging quality and pay less attention to the amount of light received. The default clear aperture in the industry is F.NO=2.8. With the continuous updating of digital products at the same time, the development of sensor technology has forced continuous breakthroughs in lens design to achieve greater light flux in order to achieve better results in PC camera and monitor material applications. Therefore, lens design with large apertures such as F.NO 2.0 and 1.8 will receive more and more attention. However, in optical design, a large diaphragm aperture also means that th...

AI Technical Summary

Problems solved by technology

However, in optical design, a large aperture also means that it is more difficult for the beam to focus effectively, more stray light and comprehensive aberrations. How to effectively eliminate aberrations while ensuring a large amount of light to obtain a good imaging effect and maximize the Reduce production costs, have good processability, and adapt to industrial mass production will be the difficulty and focus of optical design

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