Wide angle single channel projection apparatus
Patent 3998532 Issued on December 21, 1976. Estimated Expiration Date: 
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3101645 3281519 3296923 3367046 3539249 3758714 InventorApplicationNo. 459143 filed on 04/08/1974US Classes:352/69, PANORAMIC PICTURE TYPE352/132, With manned vehicle352/198, PROJECTION LIGHT SOURCES359/725, Panoramic359/731, With concave and convex reflectors in series434/40, View simulating means located on element having spherical surface434/44View simulated by projected imageExaminersPrimary: Hayes, Monroe H.Attorney, Agent or FirmInternational ClassG03B 37/00 (20060101)AbstractThe invention utilizes a vertically positioned arc lamp and associated lamp ollector-reflector in conjunction with depending associated secondary and projection mirrors, the projection mirror being convex and centrally apertured to form an exit pupil closely adjacent and above the head of an observer and in the center of a curved projection screen to minimize perspective distortion of image as seen by the viewer. The invention further provides an elimination of shadow effect by the depending relationship of the apparatus and by the recessing of arc lamp electrode through an aperture in the lamp reflector. An adaption of image spacing by recessed fitting of image on film to adapt the film to intended projector image width is also an aspect of the invention. | |
