Patent ID: 8302863

Claim:
A reading device for reading a structure made on a surface, said reading device comprising: an image capture device exhibiting an optical axis; a lighting device intended to increase the contrast of an image of a structure made on a surface, said lighting device comprising: a first light source, disposed so as to emit, along a first axis of incidence, a first light, the width of the passband of said first light, or “first passband,” being less than 100 nm, a second light source disposed so as to emit, along a second axis of incidence, a second light, the width of the passband of said second light, or “second passband,” being less than 100 nm, a third light source disposed so as to emit, along a third axis of incidence, a third light, the width of the passband of the third light, or “third passband,” being less than 100 nm, the first, second and third axes of incidence being substantially concurrent and the passbands of the first, second and third lights being mutually separated, the first and/or second axis of incidence forming, with said optical axis, first and second angles greater than 45° and less than 65°, and/or the third axis of incidence being coincident with said optical axis; and a first linear polarizing filter oriented along said optical axis and in quadrature with second polarizing filters ensuring a linear polarization of the first and second lights.