Three-piece infrared wavelength lens set

Abstract

The present invention is a three-piece infrared wavelength lens group, which sequentially includes from the object side to the image side: a first lens with negative refractive power, a convex surface at the near optical axis on the object side surface, and a convex surface at the near optical axis on the image side surface The place is concave, and at least one surface of the object side surface and the image side surface is an aspheric surface; the aperture; the second lens has positive refractive power, and the near optical axis of the image side surface is convex, and the object side surface and the image side surface are at least One surface is an aspherical surface; and the third lens has refractive power, its object side surface is convex near the optical axis, its image side surface is concave near the optical axis, and at least one of its object side surface and image side surface is non-spherical sphere. Therefore, it has the effects of improving the picture angle, 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 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] The applicant has also previously proposed a number of lens sets related to infrared wavelength reception, but the cu...

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Problems solved by technology

[0003] The applicant has also 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 2D flat 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.

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