Dual-band fingerprint identification device

By using a rotating reflective prism and a bandpass filter in the fingerprint recognition device, the problem of natural light interference was solved, enabling efficient and clear acquisition of dual-band fingerprints and improving the recognition effect.

CN224501295UActive Publication Date: 2026-07-14TRULY OPTO-ELECTRONICS TECH LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
TRULY OPTO-ELECTRONICS TECH LTD
Filing Date
2025-06-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Different wavelengths of light in natural light interfere with the acquisition of fingerprint images, resulting in poor recognition performance of multispectral fingerprint recognition devices.

Method used

The dual-band fingerprint recognition device includes a light source module, an image acquisition module, a reflective prism, a bandpass filter, and a rotating micro motor. By rotating the reflective prism and the bandpass filter, unwanted stray light in natural light is filtered out, ensuring that the light in each band is not interfered with by ambient light during image acquisition.

Benefits of technology

It effectively reduces the interference of natural light on fingerprint image acquisition at different wavelengths, improving the accuracy and clarity of fingerprint recognition.

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Abstract

The utility model discloses a kind of dual-band fingerprint identification devices, including light source module, image acquisition module, finger panel, reflecting prism, first band-pass filter film and second band-pass filter film, the light source module includes first light source and second light source;The reflecting prism has the first incident surface, the first reflecting surface and the first exit surface of constituting a optical path, and the second incident surface, the second reflecting surface and the second exit surface of constituting another optical path, and can be by rotating the first incident surface and first exit surface respectively towards the finger panel and image acquisition module, or the second incident surface and second exit surface respectively towards the finger panel and image acquisition module;The first band-pass filter film is set on the first incident surface or first exit surface, and the second band-pass filter film is set on the second incident surface or second exit surface.The dual-band fingerprint identification device can reduce the interference of natural light to the fingerprint image collected under different wavebands.
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