Patent ID: 9423611
Filing Date: 2016-08-23
CPC Classification: F21S,G02B,G06F

Claim Text:
1. A method for manufacturing a lens of a vehicular lighting apparatus, the method comprising: defining a first light emitting point (S defining a virtual light incident surface corresponding to a first assumed surface generated by computerized model to be located at a position where a light incident surface of the lens exists; defining a virtual light outgoing surface corresponding to a second assumed surface generated by computerized model to be located at a position where a light outgoing surface of the lens exists; defining a first projection point (r respectively calculating normal directions (ni) of the virtual light incident surface at a plurality of light incident points (Pi) provided on the virtual light incident surface, the plurality of light incident points (Pi) corresponding to calculated points where the lights emitted from the first and second light emitting points (S defining a shape of the virtual light incident surface based on the normal directions (ni) calculated for the respective light incident points (Pi); and forming the light incident surface of the lens to have the defined shape of the virtual light incident surface, the forming comprising manufacturing the lens of the vehicular lighting apparatus having the defined shape of the virtual light incident surface wherein: first normal directions (no the normal directions (ni) of the virtual light incident surface at the light incident points (Pi) are calculated based on second normal directions (no the lights emitted from the second light emitting point (S wherein: the first light emitting point (S the first projection point (r