The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 2002
Filed:
Jan. 22, 2001
John Graham Holden, Hemel Hempstead, GB;
Central Research Laboratories, Limited, Hayes, GB;
Abstract
Apparatus for displaying an image suspended in space comprises an object ( ) for display, a retroreflector ( ) receiving light from the object, a beamsplitter ( ) in a path for light from the object to the retroreflector, and a concave mirror ( ) between the beamsplitter and the retroreflector. The beamsplitter makes an oblique angle to the direction ( ) of propagation of the light such that it transmits some light. Light from the beamsplitter is reflected by the mirror to the retroreflector which reflects it back via the mirror to the beamsplitter. This retroreflected light is reflected by the beamsplitter to form a real image ( ) suspended in space. The use of a concave mirror improves viewability over apparatus including a converging lens because unwanted reflections from the surfaces of the lens are eliminated.