Light converging optical system and projection-type image display apparatus

摘要

A light converging optical system (1) includes a surface-emission light source (11) that emits light from a light emitting surface (12), a collimator lens (13) as a collimator optical system that converts the light emitted from the light emitting surface (12) into approximately parallel light, a condenser lens (4) as a converging lens as a light converging element that converges the light converted into the approximately parallel light, and an integrator rod (7) as a light-intensity-distribution equalizing element that has an incident surface (8) on which the light converged by the condenser lens (4) is incident, equalizes light intensity distribution of incident light, and emits the light from an emission surface (9). Among the light converged on the incident surface (7) of the integrator rod (7), a converging angle of the light converged on a center portion of the incident surface (8) is smaller than a converging angle of the light converged on a corner portion of the incident surface (8).

主权项

1. A light converging optical system comprising:
a surface-emission light source that has a light emitting surface and emits light from the light emitting surface; a collimator optical system that has a positive power and converts the light emitted from the light emitting surface into approximately parallel light; a light converging element that has a positive power and converges the light converted into the approximately parallel light; and a light-intensity-distribution equalizing element that has an incident surface on which the light converged by the light converging element is incident, equalizes light intensity distribution of incident light, and emits the light from an emission surface, wherein among the light converged on the incident surface of the light-intensity-distribution equalizing element, a converging angle of the light converged on a center portion of the incident surface is smaller than a converging angle of the light converged on a corner portion of the incident surface.