Two-piece infrared single-wavelength projection lens group

Abstract

The invention discloses a two-piece infrared single-wavelength projection lens group, which includes a first lens, an aperture and a second lens in turn from the imaging side to the image source side.The first lens has refractive power, the imaging side surface is convex in the paraxial region, the image source side surface is concave in the paraxial region, and at least one of the imaging side surface and the image source side surface is an aspheric surface. The second lens has positive refractive power, the imaging side surface is convex in the paraxial region, the image source side surfaceis concave in the paraxial region, and at least one of the imaging side surface and the image source side surface is an aspheric surface. Thus, a two-piece infrared single-wavelength projection lensgroup with a better image sensing function is achieved.

Description

technical field [0001] The invention relates to a projection lens set, in particular to a miniaturized two-piece infrared single-wavelength projection lens set 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 currently use lenses with larger picture angles. Wide-angle lenses are the mainstream. [0003] Among them, the applicant also previously proposed a number of lens set...

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Problems solved by technology

[0003] Among them, the applicant also previously proposed a number of lens sets related to infrared wavelength reception, but the current game consoles are mainly for more three-dimensional, realistic and immersive 3D games, so the current or previous lens sets of the applicant 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, for the infrared receiving and sensing lens group dedicated to the game machine, plastic lenses are used in pursuit of low cost. Firstly, the poor light transmission of the material affects the game machine Depth detection accuracy is not enough as one of the key factors. Second, the plastic lens is prone to overheating or overcooling in the ambient temperature, so that 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 requirements. Two major technical issues for accurate sensing of depth and distance in 3D games

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