Patent ID: 6204973
Filing Date: 2001-03-20
Classification: G02B

Abstract:
An apparatus for displaying an image suspended in space, comprising:an object for display;a retroreflector which is arranged to receive light from the object;a beamsplitter in a path for light from the object to the retroreflector, the beamsplitter is arranged at an oblique angle to the direction of propagation of the light such that it transmits part of the light and reflects part of the light, the light which is either transmitted or reflected by it back to the beamsplitter, which either reflects or transmits part of this retroreflected light, to form a real image suspended in space, characterized by the apparatus further comprising a converging optical element which is arranged between the beamsplitter and the retroreflector such that in use light from the beamsplitter passes through the converging optical element to the retroreflector, which reflects it back through the optical element toward the beamsplitter.