Light valve projection apparatus

• US 3,345,462 A
• Filed: 10/16/1963
• Issued: 10/03/1967
• Est. Priority Date: 10/16/1963
• Status: Expired due to Term

• Current Assignee: Henry J. Vanderlaan, William E. Good
• Original Assignee: Henry J. Vanderlaan, William E. Good
• Inventors: Good, William E., Vanderlaan, Henry J.
• Application Number:
  US04/316,607
• Time in Patent Office: 1,448 Days
• US Class Current: 348/774
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 5/7425 the modulator being a dielectric deformable layer controlled by an electron beam, e.g. eidophor projector

Claims

1. APPARATUS FOR PROJECTION OF IMAGES IN RESPONSE TO ELECTRICAL SIGNALS CORRESPONDING TO SAID IMAGES COMPRISING A PAIR OF LIGHT MASK MEMBERS EACH INSLUDING SIMILAR ARRAYS OF TRANSPARENT AND OPAQUE PORTIONS, A LIGHT MODULATING MEDIUM DEFORMABLE INTO LIGHT DIFFRACTION GRATINGS BY ELECTRON CHARGE PATTERNS THEREON LOCATED BETWEEN SAID MEMBERS, MEANS FOR FORMING SAID CHARGE PATTERNS THEREON IN RESPONSE TO SAID SIGNALS, AN EVACUATED ENCLOSURE SURROUNDING SAID MEDIUM AND SAID CHARGE PATTERN PRODUCING MEANS AND HAVING AN INPUT WINDOW PORTION FOR PERMITTING ILLUMINATION OF SAID MEDIUM BY SAID SOURCE AND AN OUTPUT WINDOW PORTION FOR PASSING LIGHT FROM SAID MEDIUM, A SOURCE OF LIGHT, A FIRST PROJECTION MEANS FOR ILLUMINATION OF SAID MEDIUM FROM SAID SOURCE THROUGH THE TRANSPARENT PORTIONS OF THE INPUT ONE OF SAID MEMBERS, SECOND PROJECTION MEANS FOR PROJECTING LIGHT FROM THE TRANSPARENT PORTIONS FROM SAID ONE MEMBER ONTO CORRESPONDING OPAQUE PORTIONS OF THE OTHER OF SAID MEMBERS IN THE ABSENCE OF ANY DEFORMATION OF SAID MEDIUM, THIRD PROJECTION MEANS FOR PROJECTING AN IMAGE OF SAID MEDIUM ONTO A SCREEN, SAID ONE MEMBER BEING FORMED ON THE INTERIOR PORTION OF THE INPUT WINDOW OF SAID ENCLOSURE