Patent ID: 7961918

Claim:
A personal identification device comprising: a light source portion that emits infrared light with a first wavelength at a time of reading a blood vessel pattern, and emits infrared light with a second wavelength longer than the first wavelength at a time of reading a fingerprint pattern; a light receiving sensor portion that detects a component of the infrared light reflected from a fingertip after being shone thereon from the light source portion; an amplifying portion that amplifies a detection signal obtained by the light receiving sensor portion; an analog/digital converting portion that converts an analog signal obtained by the amplifying portion into a digital signal; a data distributing portion that distributes the digital signal obtained by the analog/digital converting portion into two groups of data, of which one is blood vessel pattern data and the other is fingerprint pattern data; and a processing portion that verifies an identity of a person based on the blood vessel pattern data and the fingerprint pattern data distributed by the data distributing portion, wherein the light source portion comprises an intensity switching portion that switches an output intensity of the light source portion in such a way as to make up a difference in sensitivity of the light receiving sensor portion between when a blood vessel pattern is read and when a fingerprint pattern is read.