Optical system of depth camera

Abstract

The invention discloses an optical system of a depth camera. The optical system comprises six lenses that are arranged successively along the optical axis from object space to image space. The first lens has a crescent shape with a negative focal power and a convex surface of the first lens faces the object space; the second lens has a crescent shape with a negative focal power and a convex surface of the second lens faces the object space; the third lens has a biconvex shape with a positive focal power; the fourth lens has a biconcave shape with a negative focal power; the fifth lens has a biconvex shape with a positive focal power; and the sixth lens has a biconvex shape with a positive focal power. According to the optical system of the depth camera, with different lens combination units and focal-power distribution, excellent performances of large aperture, large view angle, and low distortion are realized; and on the basis of the glass-plastic mixing structure, athermalization and low manufacturing cost can be effectively considered.

Description

technical field [0001] The invention relates to a depth camera optical system, in particular to a depth camera imaging lens optical system composed of six lenses. Background technique [0002] With the development of laser lighting technology and 3D somatosensory interaction technology, the demand and application of near-infrared light sources and depth camera lenses are becoming more and more extensive. Especially with the application of 3D-TOF technology and structured light technology, a series of depth camera products have appeared on the market, such as Microsoft's Kinect, Softkinetic's DS325, ASUS Xtion, and Intel's RealSense and other depth camera products. With the application and promotion of depth cameras, the demand for depth camera lenses will also increase. Because the depth camera lens usually requires a large aperture and field of view, and at the same time requires small distortion and temperature difference changes, there are few optical lenses specially us...

AI Technical Summary

Problems solved by technology

For example, the patent CN102213821A mentions a large aperture, large field of view and small distortion optical lens, but this lens uses a glass spherical surface and three plastic aspherical lenses, and its heat dissipation effect is not good, and it can only meet 5°C-50°C , the environmental adaptability is limited

Another example is a wide-angle depth imaging lens mentioned in patent CN104204891A, which uses five plastic aspheric lenses, but the patent does not mention the optical performance that this depth imaging lens can achieve. Too much, the effect of temperature difference cannot be guaranteed

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