Patent ID: 7999982

Claim:
An image display apparatus comprising: a display device displaying an image; and an enlargement optical system presenting a viewer with an enlarged virtual image of the image displayed by the display device, wherein the enlargement optical system has a volume-phase reflection hologram optical element diffraction-reflecting image light from the display device to direct the image light to the viewer's pupil, and when an axis optically connecting between a center of a display area of the display device and a center of an optical pupil formed by the enlargement optical system is called an optical axis, two directions mutually perpendicular and perpendicular to the optical axis are called a first direction and a second direction respectively, a plane parallel to the optical axis and including the first direction at a position of the optical pupil is called a first plane, and a plane parallel to the optical axis and including the second direction at a position of the optical pupil is called a second plane, then a component of a predetermined wavelength of the image light diffraction-reflected by the hologram optical element is focused at positions different in an optical axis direction between on the first plane and on the second plane.