Patent ID: 7712930

Claim:
An optical module for projecting a light beam, comprising a light source; a main solid body of transparent material having a principal extension axis, the body having a base surface which is flat and perpendicular to the principal extension axis and in which the light source is included and, on the opposite side with respect to the principal extension axis, a central surface and an annular surface extending around the central surface, the central and annular surfaces being suitable for receiving a central portion and a peripheral portion, respectively, of a luminous flux emitted by the source, and a reflecting surface having an annular shape whose cross-section is a conic section, the reflecting surface being arranged around the solid body; wherein the central surface is designed so as to shape the central portion of the luminous flux into a predetermined distribution of luminous intensity about the principal axis; the annular surface is designed so as to produce a virtual image of the light source, said virtual image of the light source having a substantially annular shape with a point-like cross-section, said annular surface being further designed to transmit the peripheral portion of the light beam in a manner such that an angle θ 1 ′ subtended by the peripheral portion of the light beam after refraction on the annular surface is equal to or less than an angle θ 1 subtended by the peripheral portion of the light beam before refraction on the annular surface, and the reflecting surface has a focal line, said focal line and said virtual image of the light source being coincident, the reflecting surface being designed in a manner such as to reflect the peripheral portion of the luminous flux transmitted by the annular surface and to shape it into a predetermined distribution of luminous intensity about the principal axis.