Patent ID: 8345226

Claim:
A portable electronic device comprising: a wireless communications unit that transmits and receives information; a display unit; an input unit that allows a user to input information or commands; a processor (CPU); and a spectrometer that forms a spectrum of light distribution on a detection plane from an input light beam, wherein the spectrometer includes: (i) first collimating optics that collimates the input light beam in a vertical plane without collimating the input light beam in a horizontal plane that is substantially orthogonal to the vertical plane so as to produce a partially collimated light beam; (ii) light beam collimating-dispersing-focusing optics that produces a partially focused dispersed light beam from the partially collimated light beam, the partially focused dispersed light beam being focused in the horizontal plane without being focused in the vertical plane; and (iii) second focusing optics that focuses the partially focused dispersed light beam in the vertical plane to form the light distribution on the detection plane.