Patent ID: 9467670
Filing Date: 2016-10-11
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A projection device comprising: a light source group including a plurality of first light sources each emitting a first light to be projected; at least one collimator lens that converts the respective first lights into parallel light beams and emits the parallel light beams; a condensing optical system that receives the respective parallel light beams and emits concentrated light beams; and an optical element having an incident surface through which the concentrated light beams enters the optical element, wherein the condensing optical system is configured so that when a light beam parallel to an optical axis of the condensing optical system is incident on the condensing optical system, the light beam is concentrated at a position on the optical axis of the condensing optical system on the incident surface of the optical element; wherein the parallel light beams emitted from the at least one collimator lens are inclined to the optical axis of the condensing optical system and are incident at different positions of the condensing optical system on a plane perpendicular to an optical axis of the condensing optical system while approaching the optical axis of the condensing optical system; and wherein emitting positions of the concentrated light beams on an emitting surface of the condensing optical system and incident positions of the concentrated light beams on the incident surface of the optical element are opposite each other with respect to the optical axis of the condensing optical system.