Disclosed are an
infrared filter for face recognition and a manufacturing method thereof, which belong to the
biometrics identification field. The
infrared filter manufactured by adopting the method of
coating infrared-transmitting glass which has the important characteristics of
narrow band and high
cut-off height. The specific manufacturing method includes forming a narrow-band peak by
coating a filter membrane on the infrared-transmitting glass, realizing central wave length Gamma0, peak
transmittance T0 and half bandwidth B, realizing visible light
cut-off S through the thickness and the material of the infrared-transmitting glass,
coating a band-pass
cut-off filter membrane on the
float glass to realize the infrared cut-off depth S, and gluing a
colored glass coated with a narrow-band filter membrane and the
float glass coated with the band-pass cut-off filter membrane by the
photoresist. The narrow-band high cut-off depth infrared-transmitting filter manufactured by the method can be engaged with an infrared emitting
diode group to form an invisible
constant light source, thereby resolving the light problem besetting the face recognition performance for a long time.