A virtual imaging system (10) that allows a user to view a virtual image of
an object field is provided. The system includes an imaging subsystem (11)
having at least one lens (14). The imaging subsystem is arranged such that
its object field (13) is at or near its focal point, thereby positioning
the virtual image at or near infinity. In one embodiment, the imaging
subsystem further includes an image generator (15) located in the object
field. The system further includes an eyebox spreader (16) that is
arranged to receive the light transmitted from the imaging subsystem and
to redirect the light to a user's eye (2). The eyebox spreader is adapted
to effectively increase an eyebox "A" of the imaging subsystem to "B" and
thus the size of the virtual image. In one embodiment, the eyebox spreader
is formed of a Fresnel surface that defines an array of parallel,
optically flat facets thereon. Spreading the eyebox in this manner allows
for a user to view the virtual image at ease while at the same time
allowing the virtual imaging system to be compactly constructed and light
in weight.