LIGHTING OR SIGNALLING OPTICAL UNIT FOR MOTOR VEHICLE COMPRISING AN OPALINE MASK

The present invention relates to an optical lighting or signaling block for a motor vehicle comprising a housing (11) whose upper peripheral edge supports an external cover glass (12); said housing (11) containing a light comprising at least one light-emitting diode (32) as well as a transparent luminous device (20) comprising at least one light guide (21) having a light ray entry surface generated by said diode and a front exit face situated opposite said cover glass (12); said light further comprising a mask (40) laterally surrounding at least a portion of said light guide (21); characterized in that said mask (40) is made of an opaline material.