Patent ID: 8131347

Claim:
An apparatus for measuring bio-information of a user, the apparatus comprising: a device for receiving, from the user, basic bio-information including height and weight of the user; a first light source for radiating a first light having a first wavelength toward a surface of the user's skin; a second light source for radiating a second light having a second wavelength toward the surface; a third light source for radiating a third light having a third wavelength toward the surface; a photo detector detecting a first, a second and a third detection light which are transmitted through the surface and generating corresponding electrical signals, said first, second and third detection light corresponding to said light radiating from said first, second and third light sources, respectively, wherein said first and second light sources are alternatively arranged around said photo detector and said third light source is separately positioned more distant from the photo detector than the first and the second light sources; and a control unit for enabling the first to the third light sources to be driven in a known order and for producing bio-information of the user on the basis of the basic bio-information and intensities of the first to the third detection lights, wherein said first and second light sources are separated from said photo detector by no more than 5 millimeters and the third light source is separated from said photo detector by no less than 10 millimeters.