Near-infrared narrow-band optical filter used for somatosensory recognition system
A narrow-band filter and somatosensory recognition technology, which is applied in the field of optical filters, can solve the problems that the overall thickness of the optical filter is difficult to achieve an order of magnitude less than 1mm, the impact of the imaging system is large, and the anti-environmental stability is poor. Avoid multiple reflections, reduce thickness, and have a good degree of rectangularity
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[0021] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.
[0022] see figure 1 , this embodiment provides a near-infrared narrow-band filter for a motion recognition system, including a substrate 10 and a narrow-band filter main film system 20 and a cut-off film system 30 respectively located on two opposite surfaces of the substrate 10 . The substrate 10 constitutes the main structure of the optical filter. It adopts an ultra-thin transparent glass substrate. The material is ordinary optically transparent glass with a thickness between 0.3mm and 0.75mm. need to choose.
[0023] The main film system 20 of the narrow-band filter is formed by alternately stacking high-refractive index film layers 21 and low-refractive index film layers 22, and the cut-off film system 30 is also formed by alternatel...
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