Projection apparatus and projection-type image display apparatus

A projection apparatus comprising:

• a polarizing converter which converts a light beam from a light source to a polarized beam;
• a color separator which separates the polarized beam into first, second, and third color beams based on wavelength;
• a first, a second and a third optical path modifier each of which modifies an optical path associated with a corresponding one of the color beams;
• a first, a second and a third polarized light separator, each of which receives a corresponding one of the first, second, and third color beam from the optical path modifiers;
• a first, a second and a third reflective image display element, each of which receives a corresponding one of the first, second, and third color beams from the corresponding polarized light separator and provides a reflected beam to the corresponding polarized light separator;
• a color combiner which combines the reflected beams from the reflective image display elements of the polarized light separator;
• a projection lens which projects a color image from the color combiner;
• and
• wherein an anti-reflection coating is disposed at an air boundary surface between the polarizing converter and the color combiner, the anti-reflection coating being formed with a lowest reflectivity Rg, and Rr, Rg, Rb satisfying the relationship 6>Rr/Rg, 10>Rb/Rg, where Rg is a reflectivity for light having a wavelength of approximately 550 nm, Rr is a reflectivity for light having a wavelength of approximately 630 nm, and Rb is a reflectivity for light having a wavelength of approximately 430 nm.