G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 3/08 (2006.01)
Patent
CA 2485669
The invention concerns a condenser lens for generation of essentially parallel light beams, in which the condenser lens (8) curves essentially in the form of a shell around its focal point (F) and has, at least in one region (27) on the inside (20) of the shell, a Fresnel structure in the form of teeth (16) that are bounded by light inlet surfaces (14) and reflection surfaces (15), it is characterized by the fact that in the region (27), the outside (21) of the shell has gradations formed from outlet surfaces (18) and connecting surfaces (19), in which the outlet surfaces (18) are aligned essentially normal and the connecting surfaces (19) that join the adjacent outlet surfaces (18) are aligned essentially parallel to the optical axis (2). The slope and position of the reflection surfaces (15) of teeth (16) are established, so that an imaginary boundary light beam (6a), coming from focal point (F) and touching the tooth edge (22) of the preceding tooth, touches the indentation base (23) after refraction on the inlet surfaces (14) or encounters the reflection surface (15) in its immediate vicinity and runs parallel to the optical axis (2) after its reflection.
Di Otto Alexander
Silhengst Franz
Fetherstonhaugh & Co.
Swarco Futurit Verkehrssignalsysteme Ges.m.b.h.
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