A fingerprint sensor used for a fingerprint recognition system comprises a first
prism or prism array including a first surface which a human finger is placed and
a second surface; a lamp for irradiating the finger with light; a second prism
or prism array for refracting the light which is reflected from the finger and
subsequently passes through the second surface in such a way that the light refracted
by the second prism or prism array travels along a path closer to a normal to the
first surface of the first optical component than a path of light without refraction
by the second prism or prism array; and an image sensor for receiving the light
refracted by the second prism or prism array and converting fingerprint information
for the finger into an electric signal.
