Narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously

The utility model discloses a narrow-bandpass identification lens with super field depth and capable of acquiring iris images of two eyes simultaneously. A first lens with positive focal power, a second lens with negative focal power, a crescent third lens with positive focal power, and a crescent fourth lens with positive focal power are sequentially arranged along a light transmission direction from left to right on a lens shell. A first diaphragm is arranged between the first and second lenses and a second diaphragm is arranged between the third and fourth lenses. The identification lens is characterized by super field depth, narrow-bandpass transmittance, and capability of scanning and identifying the iris images of the two eyes simultaneously. Even when the human eyes perform self-regulation, the lens is not influenced and can acquire the clear and accurate iris images. By employing the narrow-bandpass spectral imaging, the signal to noise ratio of the images can be increased to an extreme extent and the iris images can be represented truthfully.