Patent ID: 7068404
Filing Date: 2006-06-27
Classification: G02B

Abstract:
1. An image combiner which comprises a reflective type holographic optical element, and which superimposes light from an image display unit on light passing through a main body of the image combiner, wherein: the reflective type holographic optical element has a third-order or higher phase conversion action that depends on a position on a hologram plane, and a distance Rd is substantially greater than a distance Pd, where Rd is a distance calculated in air between (i) a light source located on a side of eyes of an observer during end-use of two light sources that are used to expose the reflective type holographic optical element during manufacture thereof and (ii) the hologram plane of the reflective type holographic optical element, and where Pd is a distance calculated in air between an exit pupil of the image combiner and the hologram plane of the reflective type holographic optical element.