Abstract: An illuminator includes a first light source, a second light source, a first lens on which light emitted from the first and second light sources is incident, a second lens disposed in a downstream of the first lens, and a half wave plate. The first lens, the second lens and the half wave plate are arranged along a first axis. The first light source and the second light source are arranged along a plane perpendicular to the first axis. The half wave plate is disposed in the optical axis between the first lens and the second lens, the half wave plate being disposed in a position close to the second lens.

Abstract: An illuminator includes a first light source, a second light source, a first lens on which light emitted from the first and second light sources is incident, a second lens disposed in a downstream of the first lens, and a half wave plate. The first lens, the second lens and the half wave plate are arranged along a first axis. The first light source and the second light source are arranged along a plane perpendicular to the first axis. The half wave plate is disposed in the optical axis between the first lens and the second lens, the half wave plate being disposed in a position close to the second lens.

Abstract: A projection-type display apparatus includes a light source apparatus, a first optical system with a superimposing lens receiving illumination light from the source apparatus, a second optical system including a first color separator downstream the superimposing lens, mirror, and field lens, and an optical enclosure accommodating the second system. The first separator reflects, toward the mirror, first light in the illumination light belonging to a first wavelength band, and transmits light belonging to a wavelength band excluding the first wavelength band. The mirror reflects, toward the field lens, the first light reflected by the first separator. An angle between an optical axis of the superimposing lens and the first separator is greater than 45° in a first system plan view. A field lens optical axis is substantially parallel to a first system optical axis. The optical enclosure includes a fixing section holding and fixing the first separator.