Near-infrared narrow-band optical filter used for somatosensory recognition system

Abstract

The invention discloses a near-infrared narrow-band optical filter used for a somatosensory recognition system. The near-infrared narrow-band optical filter used for the somatosensory recognition system comprises a base plate and a narrow-band optical filter main film system and a cut-off film system which are respectively arranged on two opposite surfaces of the base plate. The narrow-band optical filter main film system and the cut-off film system are respectively stacked by high refractive index film layers and low refractive index film layers in alternative mode, the high refractive index film layers and the low refractive index film layers are deposited through a vacuum film coating method, and the central wavelength of a passing band of the narrow-band optical filter main film system is identical with that of an infrared emission light source of the somatosensory recognition system. The near-infrared narrow-band optical filter used for the somatosensory recognition system adopts the single base plate, and utilizes the scheme of stacking the main film system and the cut-off film system through double-face vacuum film coating; achieves the characteristics of being large in cut-off width, high in central wavelength transmission ratio and good in rectangular degree of the narrow-band optical filter of the somatosensory recognition system; reduces thickness of the optical filter; effectively prevents warping and deformation of the base plate caused by film layer stress; requires no optical adhesive; avoids multiple reflection; an can adapt to different temperature environments.

Description

technical field [0001] The invention relates to an optical filter, in particular to a near-infrared narrow-band optical filter used in a somatosensory recognition system. Background technique [0002] Somatosensory recognition technology has attracted widespread attention along with the hot sale of Microsoft's Xbox360 Kinect somatosensory system. With the continuous and in-depth development of the motion recognition system, the future motion recognition will be widely used in various fields such as industrial manufacturing, human-computer interaction, entertainment, multimedia, game applications, and shopping. At present, the somatosensory recognition system generally adopts optical imaging method, which is composed of infrared light source, 3D depth detector and RGB image detector. The most critical part is the 3D depth detector part, which is used to extract the infrared light emitted by the infrared emitter. The reflected light of the irradiated action body is acquired b...

AI Technical Summary

Problems solved by technology

The patent number is "ZL200710304305.1", and the invention title is "infrared filter for face recognition and its production method". The infrared filter made by infrared glass combined with coating method has Narrow band and high cut-off depth, but the thickness of the infrared transmission glass used in this patent reaches 3-9mm. For the tiny lens of the current somatosensory recognition system, the filter produced by this method is too thick to meet the requirements

The patent number is "ZL201020248861.9", and the utility model patent named "an infrared filter for face recognition" lists the main bandpass filter film system coated on a transparent glass substrate with regularity. , and then gluing the infrared through glass or the method of gluing the long-wave pass filter through the infrared, although it also achieves the characteristics of a good rectangular passband and a high cut-off depth, but the overall thickness of the filter is difficult to It should be less than 1mm, and when the glass substrates are glued, multiple internal interfaces will be generated, resulting in multiple reflections, which will have a great impact on the imaging system. At the same time, the adhesive will have poor environmental stability, especially at high temperature. places with large changes

Modern camera products require smaller and smaller volumes, higher and higher requirements for image quality and color reproduction, and the infrared narrow-band filter embedded in front of the CMOS depth-of-field detector generally requires a thickness of only 0.3mm-0.75mm , such a thin substrate thickness space, if the method of combining infrared glass with coating or the method of gluing infrared glass after coating with white glass, it is impossible to achieve a high narrow-band filtering effect under the condition of ultra-thin substrate thickness

Images