Three-piece type infrared single-wavelength lens group

Abstract

The invention relates to a three-piece type infrared single-wavelength lens group, which sequentially comprises a first lens, an aperture, a second lens and a third lens from the object side to the image side; the first lens has negative refractive power, a convex face is arranged, near an optical axis, on the object side surface of the first lens, a concave surface is arranged, near the optical axis, on the image side surface of the first lens and at least one of the object side surface and the image side surface of the first lens is a non-spherical face; the second lens has positive refractive power, a convex face is arranged, near the optical axis, of the image side surface of the second lens and at least one surface of the object side surface and the image side surface of the second lens is a non-spherical face; and the third lens has refractive power, a convex face is arranged, near an optical axis, on the object side surface of the third lens, a concave surface is arranged, nearthe optical axis, on the image side surface of the third lens and at least one of the object side surface and the image side surface of the third lens is a non-spherical face. Therefore, the lens group has the effects of angle drawing improvement, large aperture, short lens length and less distortion.

Description

technical field [0001] The invention relates to lens groups, in particular to a miniaturized three-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 infrared receiving and sensing field of game machines in recent years. In order to make the game machine sense a wider range of users, most of the lens groups that receive infrared wavelengths are wide-angle lenses with larger picture angles. group is dominant. [0003] Among them, the applicant previously proposed a number of lens sets related to infrared wavelength reception, ...

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 more three-dimensional, real and more immersive 3D games, and the current or previous lens sets of the applicant are all based on 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 sets dedicated to game consoles, plastic lenses are used in pursuit of low cost. First, the poor light transmission 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. Because the ambient temperature is too hot or too cold, the focal length of the lens group changes and cannot accurately focus detection. As mentioned above, the current infrared wavelength receiving lens group cannot meet the two technical issues of accurate sensing of depth and distance in 3D games.

Images