Patent ID: 6671100
Filing Date: 2003-12-30
Classification: G02B

Abstract:
A virtual imaging system for a user to view a virtual image of an object field, comprising:an imaging subsystem compuising at least one lens, the imaging subsystem being positioned with an object field at or near its focal point, thereby positioning the virtual image at or near infinity; and an eyebox spreader arranged to receive the light transmitted from the imaging subsystem and to redirect the lisht to a wsers eye, the cychox spreader being adapted to effectively increase the cyebox of the imaging subsystem, the cychox spreader comprising a Fresnel surface that defines an array of parallel, optically flat facets thereon; wherein the facets are adapted to produce light ribbons, each light ribbon having a width greater than 0.5 mm, and each gap hetween the light ribbons being less than 2 mm.