Illumination device and image projection apparatus

An illumination device comprising:

• a light source unit including:
• a light source to emit a light beam;
• and
• a wavelength converter rotatable to convert a wavelength of the light beam:
• another light source unit including:
• another light source to emit another light beam;
• and
• another wavelength converter rotatable to convert another wavelength of said another light beam;
• a light homogenizer to homogenize the light beam and said another light beam;
• and
• a light combiner to:
• bend the light beam to guide the light beam into the light homogenizer in one direction, and
• guide said another light beam into the light homogenizer in another direction parallel to said one direction,
• wherein a relation below is satisfied:
• D>d
• where:
• D is a distance between a plane A and a plane B in a perpendicular direction perpendicular to the plane A, and
• d is a distance between a rotation center of the wavelength converter and another rotation center of said another wavelength converter, or between a center of the light source and another center of said another light source, in the perpendicular direction,
• where:
• the plane A is a plane including:
• a position of a brightest irradiation spot on the wavelength converter;
• and
• a position of a brightest irradiation spot on the light homogenizer,
• wherein the plane A is parallel to an optical path of the light beam incident on the light homogenizer, and
• the plane B is a plane including:
• a position of a brightest irradiation spot on said another wavelength converter;
• and
• a position of a brightest irradiation spot on the light homogenizer,
• wherein the plane B is parallel to the plane A.