Four-piece infrared single-wavelength lens set

Abstract

The invention relates to a four-piece type infrared single-wavelength lens group comprising an aperture, a first lens, a second lens, a third lens, and a fourth lens that are arranged successively from an object side to an image side. The first lens has a positive refractive power; and a convex surface is formed at the part, being close to the axis, of the surface of the object side and a concavesurface is formed at the part, being close to the axis, of the surface of the image side. The second lens has a positive refractive power; and a concave surface is formed at the part, being close to the axis, of the surface of the object side and a convex surface is formed at the part, being close to the axis, of the surface of the image side. The third lens has a refractive power; and a a concavesurface is formed at the part, being close to the axis, of the surface of the object side and a convex surface is formed at the part, being close to the axis, of the surface of the image side. And the fourth lens has a refraction power; and a convex surface is formed at the part, being close to the axis, of the surface of the object side and a concave surface is formed at the part, being close tothe axis, of the surface of the image side.

Description

technical field [0001] The invention is related to the lens group, in particular to a miniaturized four-piece infrared single-wavelength lens group applied to electronic products. Background technique [0002] Today's digital imaging technology is constantly innovating and changing, especially in the miniaturization of digital carriers such as digital cameras and mobile phones, and the photosensitive components such as CCD or CMOS are also required to be more miniaturized. In the application of infrared focusing lenses, in addition to using In the field of photography, it has also been widely used in the field of infrared receiving and sensing of game machines in recent years. In order to make the range of game machines sensing users wider, most of the lens groups that receive infrared wavelengths are those with larger picture angles. Wide-angle lenses are the mainstream. [0003] Among them, the applicant previously proposed a number of lens sets related to infrared wavele...

AI Technical Summary

Problems solved by technology

[0003] Among them, the applicant previously proposed a number of lens sets related to infrared wavelength reception, but the current game consoles are mainly for 3D games with more three-dimensional, real and immersive sense, so the current or the applicant's previous lens sets are all in the form of 2D plane game detection is a requirement, so that it cannot meet the depth sensing function that 3D games focus on

[0004] Furthermore, the infrared receiving and sensing lens sets dedicated to game consoles use plastic lenses in pursuit of low cost. First, the poor light transmittance of the material is one of the key factors affecting the lack of depth detection accuracy of game consoles. Second, plastic lenses are easy to detect. When the ambient temperature is too hot or too cold, the focal length of the lens group changes and cannot be accurately focused. As mentioned above, the current infrared wavelength receiving lens group cannot meet the two technical issues of accurate sensing of the depth and distance of 3D games.

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